Quarterly report pursuant to Section 13 or 15(d)

Schedule of Available-for-sale Securities Reconciliation, Non-Agency Unamortized Net Discount and Designated Credit Reserves (Details)

v3.10.0.1
Schedule of Available-for-sale Securities Reconciliation, Non-Agency Unamortized Net Discount and Designated Credit Reserves (Details) - Mortgage-backed Securities, Issued by Private Enterprises [Member] - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Debt Securities, Available-for-sale, Designated Credit Reserve [Member]    
Debt Securities, Available-for-sale, Unamortized Discount [Roll Forward]    
Total discount/premium on available-for-sale securities, beginning balance $ 653,613 $ 367,437
Acquisitions 606,728 217,206
Accretion of net discount 0 0
Realized credit losses 20,983 11,385
Reclassification adjustment for other-than-temporary impairments 363 429
Transfers from (to) (44,972) (44,412)
Sales, calls, other 0 3,588
Total discount/premium on available-for-sale securities, ending balance 1,194,749 525,687
Debt Securities, Available-for-sale, Net Unamortized Discount/Premium [Member]    
Debt Securities, Available-for-sale, Unamortized Discount [Roll Forward]    
Total discount/premium on available-for-sale securities, beginning balance 607,609 623,440
Acquisitions 37,924 111,938
Accretion of net discount (64,538) (67,219)
Realized credit losses 0 0
Reclassification adjustment for other-than-temporary impairments 0 0
Transfers from (to) 44,972 44,412
Sales, calls, other 18,430 81,846
Total discount/premium on available-for-sale securities, ending balance 607,537 630,725
Debt Securities, Available-for-sale, Total Discount/Premium [Member]    
Debt Securities, Available-for-sale, Unamortized Discount [Roll Forward]    
Total discount/premium on available-for-sale securities, beginning balance 1,261,222 990,877
Acquisitions 644,652 329,144
Accretion of net discount (64,538) (67,219)
Realized credit losses 20,983 11,385
Reclassification adjustment for other-than-temporary impairments 363 429
Transfers from (to) 0 0
Sales, calls, other 18,430 85,434
Total discount/premium on available-for-sale securities, ending balance $ 1,802,286 $ 1,156,412