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Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less than 12 months, Estimated Fair Value $ 444,596 $ 21,795
Available-for-sale, Less than 12 months, Unrealized Losses (2,894) (6)
Available-for-sale, 12 months or Longer, Estimated Fair Value 0 0
Available-for-sale, 12 months or longer, Unrealized Losses 0 0
Available-for-sale, Total, Estimated Fair Value 444,596 21,795
Available-for-sale, Total, Unrealized Losses (2,894) (6)
Held-to-maturity, Less than 12 months, Estimated Fair Value 572,009 86,523
Held-to-maturity, Less than 12 months, Unrealized Losses (8,309) (546)
Held-to-maturity, 12 months or longer, Estimated Fair Value 55,402 46,965
Held-to-maturity, 12 months or longer, Unrealized Losses (1,462) (2,680)
Held-to-maturity, Total, Estimated Fair Value 627,411 133,488
Held-to-maturity, total, unrealized losses (9,771) (3,226)
Total securities, Less than 12 months, Estimated Fair Value 1,016,605 108,318
Total securities, Less than 12 months, Unrealized Losses (11,203) (552)
Total securities, 12 months or longer, Estimated Fair Value 55,402 46,965
Total securities, 12 months or longer, Unrealized Losses (1,462) (2,680)
Total securities, Estimated Fair Value 1,072,007 155,283
Total securities, Unrealized Losses (12,665) (3,232)
U.S. government and agency obligations | Investment securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less than 12 months, Estimated Fair Value 82,395 17,029
Available-for-sale, Less than 12 months, Unrealized Losses (471) (2)
Available-for-sale, 12 months or Longer, Estimated Fair Value 0 0
Available-for-sale, 12 months or longer, Unrealized Losses 0 0
Available-for-sale, Total, Estimated Fair Value 82,395 17,029
Available-for-sale, Total, Unrealized Losses (471) (2)
State, municipal, and sovereign debt obligations | Investment securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 75,329 2,823
Held-to-maturity, Less than 12 months, Unrealized Losses (1,063) (23)
Held-to-maturity, 12 months or longer, Estimated Fair Value 4,383 7,509
Held-to-maturity, 12 months or longer, Unrealized Losses (101) (208)
Held-to-maturity, Total, Estimated Fair Value 79,712 10,332
Held-to-maturity, total, unrealized losses (1,164) (231)
Corporate debt securities | Investment securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less than 12 months, Estimated Fair Value 1,989  
Available-for-sale, Less than 12 months, Unrealized Losses (11)  
Available-for-sale, 12 months or Longer, Estimated Fair Value 0  
Available-for-sale, 12 months or longer, Unrealized Losses 0  
Available-for-sale, Total, Estimated Fair Value 1,989  
Available-for-sale, Total, Unrealized Losses (11)  
Held-to-maturity, Less than 12 months, Estimated Fair Value 38,304 10,192
Held-to-maturity, Less than 12 months, Unrealized Losses (1,279) (255)
Held-to-maturity, 12 months or longer, Estimated Fair Value 0 35,935
Held-to-maturity, 12 months or longer, Unrealized Losses 0 (2,397)
Held-to-maturity, Total, Estimated Fair Value 38,304 46,127
Held-to-maturity, total, unrealized losses (1,279) (2,652)
Asset-backed securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less than 12 months, Estimated Fair Value 279,486 4,766
Available-for-sale, Less than 12 months, Unrealized Losses (1,489) (4)
Available-for-sale, 12 months or Longer, Estimated Fair Value 0 0
Available-for-sale, 12 months or longer, Unrealized Losses 0 0
Available-for-sale, Total, Estimated Fair Value 279,486 4,766
Available-for-sale, Total, Unrealized Losses (1,489) (4)
Mortgage-backed securities:    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 458,376 73,508
Held-to-maturity, Less than 12 months, Unrealized Losses (5,967) (268)
Held-to-maturity, 12 months or longer, Estimated Fair Value 51,019 3,521
Held-to-maturity, 12 months or longer, Unrealized Losses (1,361) (75)
Held-to-maturity, Total, Estimated Fair Value 509,395 77,029
Held-to-maturity, total, unrealized losses (7,328) (343)
Mortgage-backed securities: | Investment securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less than 12 months, Estimated Fair Value 80,726  
Available-for-sale, Less than 12 months, Unrealized Losses (923)  
Available-for-sale, 12 months or Longer, Estimated Fair Value 0  
Available-for-sale, 12 months or longer, Unrealized Losses 0  
Available-for-sale, Total, Estimated Fair Value 80,726  
Available-for-sale, Total, Unrealized Losses (923)  
Mortgage-backed securities: | Agency residential    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 445,399 69,882
Held-to-maturity, Less than 12 months, Unrealized Losses (5,822) (256)
Held-to-maturity, 12 months or longer, Estimated Fair Value 50,133 1,815
Held-to-maturity, 12 months or longer, Unrealized Losses (1,358) (27)
Held-to-maturity, Total, Estimated Fair Value 495,532 71,697
Held-to-maturity, total, unrealized losses (7,180) (283)
Mortgage-backed securities: | Agency commercial    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 2,255 3,626
Held-to-maturity, Less than 12 months, Unrealized Losses (41) (12)
Held-to-maturity, 12 months or longer, Estimated Fair Value 886 1,706
Held-to-maturity, 12 months or longer, Unrealized Losses (3) (48)
Held-to-maturity, Total, Estimated Fair Value 3,141 5,332
Held-to-maturity, total, unrealized losses (44) (60)
Mortgage-backed securities: | Non-agency commercial    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, Less than 12 months, Estimated Fair Value 10,722  
Held-to-maturity, Less than 12 months, Unrealized Losses (104)  
Held-to-maturity, 12 months or longer, Estimated Fair Value 0  
Held-to-maturity, 12 months or longer, Unrealized Losses 0  
Held-to-maturity, Total, Estimated Fair Value 10,722  
Held-to-maturity, total, unrealized losses $ (104) $ 0