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Investment Securities Available for Sale - Stated Reset Periods of Investment Securities Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 1,400,370 $ 1,413,081
Less than 6 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 109,252 182,128
6 to 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 17,856 24,726
More than 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 1,273,262 1,206,227
Agency RMBS    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 1,161,445 1,169,536
Agency RMBS | Less than 6 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 26,019 26,876
Agency RMBS | 6 to 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 17,856 24,726
Agency RMBS | More than 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 1,117,570 1,117,934
Non-Agency RMBS    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 99,212 102,125
Non-Agency RMBS | Less than 6 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 14,947 84,461
Non-Agency RMBS | 6 to 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 0 0
Non-Agency RMBS | More than 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 84,265 17,664
CMBS    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 139,713 141,420
CMBS | Less than 6 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 68,286 70,791
CMBS | 6 to 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 0 0
CMBS | More than 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 71,427 $ 70,629