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Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Securities have been in a continuous unrealized loss position, number of positions 55 37
Securities have been in a continuous unrealized loss position, fair value $ 418,889 $ 290,820
Securities have been in a continuous unrealized loss position, unrealized losses 5,240 7,766
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 344,518 76,729
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 4,695 186
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 74,371 214,091
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 545 $ 7,580
US Government Agencies Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 1 1
Securities have been in a continuous unrealized loss position, fair value $ 4,897 $ 4,988
Securities have been in a continuous unrealized loss position, unrealized losses 3 1
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 4,897 4,988
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 3 1
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0 $ 0
Corporate Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 7 14
Securities have been in a continuous unrealized loss position, fair value $ 52,141 $ 113,734
Securities have been in a continuous unrealized loss position, unrealized losses 279 6,266
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 22,403 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 16 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 29,738 113,734
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 263 $ 6,266
Collateralized Loan Obligations [Member]    
Securities have been in a continuous unrealized loss position, number of positions 6 13
Securities have been in a continuous unrealized loss position, fair value $ 44,633 $ 99,199
Securities have been in a continuous unrealized loss position, unrealized losses 282 1,363
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 0 7,441
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 0 52
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 44,633 91,758
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 282 $ 1,311
Other Debt Obligations [Member]    
Securities have been in a continuous unrealized loss position, number of positions 14 28
Securities have been in a continuous unrealized loss position, fair value $ 101,671 $ 217,921
Securities have been in a continuous unrealized loss position, unrealized losses 564 7,630
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 27,300 12,429
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 19 53
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 74,371 205,492
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 545 $ 7,577
Collateralized Mortgage Backed Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 41 9
Securities have been in a continuous unrealized loss position, fair value $ 317,218 $ 72,899
Securities have been in a continuous unrealized loss position, unrealized losses 4,676 136
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 317,218 64,300
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 4,676 133
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 8,599
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0 $ 3
REMIC and CMO [Member]    
Securities have been in a continuous unrealized loss position, number of positions 11  
Securities have been in a continuous unrealized loss position, fair value $ 112,847  
Securities have been in a continuous unrealized loss position, unrealized losses 1,725  
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 112,847  
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,725  
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  
GNMA [Member]    
Securities have been in a continuous unrealized loss position, number of positions 4 1
Securities have been in a continuous unrealized loss position, fair value $ 11,404 $ 10,341
Securities have been in a continuous unrealized loss position, unrealized losses 270 22
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 11,404 10,341
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 270 22
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0 $ 0
FNMA [Member]    
Securities have been in a continuous unrealized loss position, number of positions 16 5
Securities have been in a continuous unrealized loss position, fair value $ 107,883 $ 32,463
Securities have been in a continuous unrealized loss position, unrealized losses 1,160 31
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 107,883 23,864
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,160 28
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 8,599
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0 $ 3
FHLMC [Member]    
Securities have been in a continuous unrealized loss position, number of positions 10 3
Securities have been in a continuous unrealized loss position, fair value $ 85,084 $ 30,095
Securities have been in a continuous unrealized loss position, unrealized losses 1,521 83
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 85,084 30,095
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,521 83
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 0 0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0 $ 0