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Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Securities have been in a continuous unrealized loss position, number of positions 42 62
Securities have been in a continuous unrealized loss position, fair value $ 275,453 $ 441,043
Securities have been in a continuous unrealized loss position, unrealized losses 31,551 10,101
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 96,682 146,957
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 3,797 1,363
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 178,771 294,086
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 27,754 $ 8,738
Other Debt Obligations [Member]    
Securities have been in a continuous unrealized loss position, number of positions 29 29
Securities have been in a continuous unrealized loss position, fair value $ 199,225 $ 222,187
Securities have been in a continuous unrealized loss position, unrealized losses 31,137 8,162
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 32,141 25,451
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 3,426 108
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 167,084 196,736
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 27,711 $ 8,054
FNMA [Member]    
Securities have been in a continuous unrealized loss position, number of positions 1 8
Securities have been in a continuous unrealized loss position, fair value $ 8,812 $ 67,618
Securities have been in a continuous unrealized loss position, unrealized losses 24 426
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 0 19,073
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 0 138
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 8,812 48,545
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 24 $ 288
Collateralized Mortgage Backed Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 13 33
Securities have been in a continuous unrealized loss position, fair value $ 76,228 $ 218,856
Securities have been in a continuous unrealized loss position, unrealized losses 414 1,939
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 64,541 121,506
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 371 1,255
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 11,687 97,350
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 43 $ 684
Corporate Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 16 16
Securities have been in a continuous unrealized loss position, fair value $ 111,853 $ 123,050
Securities have been in a continuous unrealized loss position, unrealized losses 18,148 6,950
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 9,620 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 380 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 102,233 123,050
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 17,768 $ 6,950
Collateralized Loan Obligations [Member]    
Securities have been in a continuous unrealized loss position, number of positions 13 13
Securities have been in a continuous unrealized loss position, fair value $ 87,372 $ 99,137
Securities have been in a continuous unrealized loss position, unrealized losses 12,989 1,212
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 22,521 25,451
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 3,046 108
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 64,851 73,686
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 9,943 $ 1,104
REMIC and CMO [Member]    
Securities have been in a continuous unrealized loss position, number of positions 12 23
Securities have been in a continuous unrealized loss position, fair value $ 67,416 $ 120,989
Securities have been in a continuous unrealized loss position, unrealized losses 390 1,440
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 64,541 102,384
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 371 1,117
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 2,875 18,605
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 19 $ 323
FHLMC [Member]    
Securities have been in a continuous unrealized loss position, number of positions   1
Securities have been in a continuous unrealized loss position, fair value   $ 30,200
Securities have been in a continuous unrealized loss position, unrealized losses   73
Securities have been in a continuous unrealized loss position, less than 12 months, fair value   0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses   0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value   30,200
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses   $ 73
GNMA [Member]    
Securities have been in a continuous unrealized loss position, number of positions   1
Securities have been in a continuous unrealized loss position, fair value   $ 49
Securities have been in a continuous unrealized loss position, unrealized losses   0
Securities have been in a continuous unrealized loss position, less than 12 months, fair value   49
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses   0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value   0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses   $ 0