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)

v3.8.0.1
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
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Available-for-sale Securities, Designated Credit Reserve [Member]    
Available-for-sale Securities, Unamortized Discount [Roll Forward]    
Total discount/premium on available-for-sale securities, beginning balance $ (653,613) $ (367,437)
Acquisitions (73,882) (88,719)
Accretion of net discount 0 0
Realized credit losses 5,482 4,546
Reclassification adjustment for other-than-temporary impairments (94) 0
Transfers from (to) 10,090 8,754
Sales, calls, other 0 0
Total discount/premium on available-for-sale securities, ending balance (712,017) (442,856)
Available-for-sale Securities, Net Unamortized Discount/Premium[Member]    
Available-for-sale Securities, Unamortized Discount [Roll Forward]    
Total discount/premium on available-for-sale securities, beginning balance (607,609) (623,440)
Acquisitions (3,733) (71,471)
Accretion of net discount 22,154 22,183
Realized credit losses 0 0
Reclassification adjustment for other-than-temporary impairments 0 0
Transfers from (to) (10,090) (8,754)
Sales, calls, other 18,430 21,089
Total discount/premium on available-for-sale securities, ending balance (580,848) (660,393)
Available-for-sale Securities, Total Discount/Premium [Member]    
Available-for-sale Securities, Unamortized Discount [Roll Forward]    
Total discount/premium on available-for-sale securities, beginning balance (1,261,222) (990,877)
Acquisitions (77,615) (160,190)
Accretion of net discount 22,154 22,183
Realized credit losses 5,482 4,546
Reclassification adjustment for other-than-temporary impairments (94) 0
Transfers from (to) 0 0
Sales, calls, other 18,430 21,089
Total discount/premium on available-for-sale securities, ending balance $ (1,292,865) $ (1,103,249)