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)

v3.20.1
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]
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
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 $ (1,322,762)
Acquisitions (80,128)
Accretion of net discount 0
Realized credit losses 4,827
Reclassification adjustment for other-than-temporary impairments 2,337
Transfers from (to) 3,732
Sales, calls, other (1,741)
Total discount/premium on available-for-sale securities, ending balance (1,393,735)
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 (603,591)
Acquisitions 16,434
Accretion of net discount 14,225
Realized credit losses 0
Reclassification adjustment for other-than-temporary impairments 0
Transfers from (to) (3,732)
Sales, calls, other 90,669
Total discount/premium on available-for-sale securities, ending balance (485,995)
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 (1,926,353)
Acquisitions (63,694)
Accretion of net discount 14,225
Realized credit losses 4,827
Reclassification adjustment for other-than-temporary impairments 2,337
Transfers from (to) 0
Sales, calls, other 88,928
Total discount/premium on available-for-sale securities, ending balance $ (1,879,730)