Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 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 737,765 373,051
Accretion of net discount 0 0
Realized credit losses 26,457 17,539
Reclassification adjustment for other-than-temporary impairments 470 789
Transfers from (to) (42,629) (66,537)
Sales, calls, other 0 3,588
Total discount/premium on available-for-sale securities, ending balance 1,322,762 653,613
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 60,894 57,732
Accretion of net discount (89,111) (88,037)
Realized credit losses 0 0
Reclassification adjustment for other-than-temporary impairments 0 0
Transfers from (to) 42,629 66,537
Sales, calls, other 18,430 52,063
Total discount/premium on available-for-sale securities, ending balance 603,591 607,609
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 798,659 430,783
Accretion of net discount (89,111) (88,037)
Realized credit losses 26,457 17,539
Reclassification adjustment for other-than-temporary impairments 470 789
Transfers from (to) 0 0
Sales, calls, other 18,430 55,651
Total discount/premium on available-for-sale securities, ending balance $ 1,926,353 $ 1,261,222