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Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 1  
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 19,908  
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 265  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 19,908  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 265  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 0  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0  
Securities have been in a continuous unrealized loss position, number of positions 57 37
Securities have been in a continuous unrealized loss position, fair value $ 423,234 $ 290,820
Securities have been in a continuous unrealized loss position, unrealized losses 7,828 7,766
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 287,669 76,729
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 6,484 186
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 135,565 214,091
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 1,344 $ 7,580
US States and Political Subdivisions Debt Securities [Member]    
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 1  
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 19,908  
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 265  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 19,908  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 265  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 0  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0  
US Government Agencies Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 2 1
Securities have been in a continuous unrealized loss position, fair value $ 6,205 $ 4,988
Securities have been in a continuous unrealized loss position, unrealized losses 34 1
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 6,205 4,988
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 34 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 8 14
Securities have been in a continuous unrealized loss position, fair value $ 79,061 $ 113,734
Securities have been in a continuous unrealized loss position, unrealized losses 940 6,266
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 0 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 0 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 79,061 113,734
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 940 $ 6,266
Collateralized Loan Obligations [Member]    
Securities have been in a continuous unrealized loss position, number of positions 8 13
Securities have been in a continuous unrealized loss position, fair value $ 56,504 $ 99,199
Securities have been in a continuous unrealized loss position, unrealized losses 404 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 56,504 91,758
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 404 $ 1,311
Other Debt Obligations [Member]    
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 1  
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 19,908  
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss 265  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, fair value 19,908  
Held-to-maturity securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 265  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 0  
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 0  
Securities have been in a continuous unrealized loss position, number of positions 18 28
Securities have been in a continuous unrealized loss position, fair value $ 141,770 $ 217,921
Securities have been in a continuous unrealized loss position, unrealized losses 1,378 7,630
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 6,205 12,429
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 34 53
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 135,565 205,492
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ 1,344 $ 7,577
Collateralized Mortgage Backed Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 39 9
Securities have been in a continuous unrealized loss position, fair value $ 281,464 $ 72,899
Securities have been in a continuous unrealized loss position, unrealized losses 6,450 136
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 281,464 64,300
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 6,450 133
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 8  
Securities have been in a continuous unrealized loss position, fair value $ 56,685  
Securities have been in a continuous unrealized loss position, unrealized losses 1,260  
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 56,685  
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 1,260  
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 2 1
Securities have been in a continuous unrealized loss position, fair value $ 10,932 $ 10,341
Securities have been in a continuous unrealized loss position, unrealized losses 312 22
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 10,932 10,341
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 312 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 $ 116,082 $ 32,463
Securities have been in a continuous unrealized loss position, unrealized losses 2,196 31
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 116,082 23,864
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 2,196 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 13 3
Securities have been in a continuous unrealized loss position, fair value $ 97,765 $ 30,095
Securities have been in a continuous unrealized loss position, unrealized losses 2,682 83
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 97,765 30,095
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses 2,682 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