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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Securities in the available-for-sale portfolio in a continuous loss position    
Number of individual securities in a continuous loss position | security 145 50
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses $ (86,424) $ (10,705)
12 Months or More Unrealized Losses (8) (25)
Total Unrealized Losses (86,432) (10,730)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 3,187,382 1,068,883
12 Months or More Fair Value 5,020 6,190
Total Fair Value 3,192,402 1,075,073
U.S. Treasury and government agency debt securities    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (2,468) (61)
Total Unrealized Losses (2,468) (61)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 121,457 38,507
Total Fair Value 121,457 38,507
Residential - Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (7,373) (725)
Total Unrealized Losses (7,373) (725)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 511,463 64,987
Total Fair Value 511,463 64,987
Commercial - Government agency    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (3,845) (119)
Total Unrealized Losses (3,845) (119)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 248,776 32,346
Total Fair Value 248,776 32,346
Commercial - Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (47,535) (7,983)
Total Unrealized Losses (47,535) (7,983)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 898,725 427,759
Total Fair Value 898,725 427,759
Government agency    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (2,974) (994)
12 Months or More Unrealized Losses (8) (25)
Total Unrealized Losses (2,982) (1,019)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 370,875 209,124
12 Months or More Fair Value 5,020 6,190
Total Fair Value 375,895 215,314
Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (22,229) (823)
Total Unrealized Losses (22,229) (823)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 1,036,086 296,160
Total Fair Value $ 1,036,086 $ 296,160