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
 6 Months Ended
Jun. 30, 2018
Jun. 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 310,985 100,558
Accretion of net discount 0 0
Realized credit losses 14,810 8,424
Reclassification adjustment for other-than-temporary impairments 268 429
Transfers from (to) (26,222) (22,676)
Sales, calls, other 0 3,588
Total discount/premium on available-for-sale securities, ending balance 923,834 433,736
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 14,025 78,796
Accretion of net discount (44,611) (44,301)
Realized credit losses 0 0
Reclassification adjustment for other-than-temporary impairments 0 0
Transfers from (to) 26,222 22,676
Sales, calls, other 18,430 52,063
Total discount/premium on available-for-sale securities, ending balance 584,815 628,548
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 325,010 179,354
Accretion of net discount (44,611) (44,301)
Realized credit losses 14,810 8,424
Reclassification adjustment for other-than-temporary impairments 268 429
Transfers from (to) 0 0
Sales, calls, other 18,430 55,651
Total discount/premium on available-for-sale securities, ending balance $ 1,508,649 $ 1,062,284