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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Securities in the available-for-sale portfolio in a continuous loss position    
Number of individual securities in a continuous loss position | security 50 118
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses $ (10,705) $ (9,658)
12 Months or More Unrealized Losses (25) (14,329)
Total Unrealized Losses (10,730) (23,987)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 1,068,883 1,314,806
12 Months or More Fair Value 6,190 994,155
Total Fair Value 1,075,073 2,308,961
U.S. Treasury and government agency debt securities    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (61)  
Total Unrealized Losses (61)  
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 38,507  
Total Fair Value 38,507  
Government-sponsored enterprises debt securities    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses   (277)
Total Unrealized Losses   (277)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value   49,716
Total Fair Value   49,716
Residential - Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (725) (115)
12 Months or More Unrealized Losses   (1,558)
Total Unrealized Losses (725) (1,673)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 64,987 76,481
12 Months or More Fair Value   109,025
Total Fair Value 64,987 185,506
Residential - Government agency    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (119)  
12 Months or More Unrealized Losses   (1,146)
Total Unrealized Losses (119) (1,146)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 32,346  
12 Months or More Fair Value   109,614
Total Fair Value 32,346 109,614
Commercial - Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (7,983) (634)
Total Unrealized Losses (7,983) (634)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 427,759 38,062
Total Fair Value 427,759 38,062
Government agency    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (994) (8,049)
12 Months or More Unrealized Losses (25) (8,299)
Total Unrealized Losses (1,019) (16,348)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 209,124 969,762
12 Months or More Fair Value 6,190 565,764
Total Fair Value 215,314 1,535,526
Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (823) (583)
12 Months or More Unrealized Losses   (3,326)
Total Unrealized Losses (823) (3,909)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 296,160 180,785
12 Months or More Fair Value   209,752
Total Fair Value $ 296,160 $ 390,537