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Investment Securities Available for Sale - Stated Reset Periods of Investment Securities Available for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 674,161 $ 818,976
Less than 6 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 119,705 185,668
6 to 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 23,332 27,272
More than 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 531,124 606,036
Agency RMBS    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 415,032 526,363
Agency RMBS | Less than 6 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 36,940 53,043
Agency RMBS | 6 to 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 23,332 27,272
Agency RMBS | More than 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 354,760 446,048
Non-Agency RMBS    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 133,022 163,284
Non-Agency RMBS | Less than 6 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 6,205 50,080
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 126,817 113,204
U.S. Treasury Securities    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 2,924 2,887
U.S. Treasury Securities | Less than 6 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 0 0
U.S. Treasury Securities | 6 to 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 0 0
U.S. Treasury Securities | More than 24 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 2,924 2,887
CMBS    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 123,183 126,442
CMBS | Less than 6 months    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 76,560 82,545
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 $ 46,623 $ 43,897