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Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less than 12 months, Estimated Fair Value $ 450,977 $ 444,596
Available-for-sale, Less than 12 months, Unrealized Losses (17,928) (2,894)
Available-for-sale, 12 months or Longer, Estimated Fair Value 20,326 0
Available-for-sale, 12 months or longer, Unrealized Losses (286) 0
Available-for-sale, Total, Estimated Fair Value 471,303 444,596
Available-for-sale, Total, Unrealized Losses (18,214) (2,894)
Held-to-maturity, Less than 12 months, Estimated Fair Value 709,976 572,009
Held-to-maturity, Less than 12 months, Unrealized Losses (37,533) (8,309)
Held-to-maturity, 12 months or longer, Estimated Fair Value 225,238 55,402
Held-to-maturity, 12 months or longer, Unrealized Losses (16,989) (1,462)
Held-to-maturity, Total, Estimated Fair Value 935,215 627,411
Held-to-maturity, total, unrealized losses (54,522) (9,771)
Total securities, Less than 12 months, Estimated Fair Value 1,160,953 1,016,605
Total securities, Less than 12 months, Unrealized Losses (55,461) (11,203)
Total securities, 12 months or longer, Estimated Fair Value 245,564 55,402
Total securities, 12 months or longer, Unrealized Losses (17,275) (1,462)
Total securities, Estimated Fair Value 1,406,518 1,072,007
Total securities, Unrealized Losses (72,736) (12,665)
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 76,857 82,395
Available-for-sale, Less than 12 months, Unrealized Losses (3,811) (471)
Available-for-sale, 12 months or Longer, Estimated Fair Value 5,017 0
Available-for-sale, 12 months or longer, Unrealized Losses (44) 0
Available-for-sale, Total, Estimated Fair Value 81,874 82,395
Available-for-sale, Total, Unrealized Losses (3,855) (471)
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 4,784 1,989
Available-for-sale, Less than 12 months, Unrealized Losses (216) (11)
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 4,784 1,989
Available-for-sale, Total, Unrealized Losses (216) (11)
Held-to-maturity, Less than 12 months, Estimated Fair Value 6,080 38,304
Held-to-maturity, Less than 12 months, Unrealized Losses (87) (1,279)
Held-to-maturity, 12 months or longer, Estimated Fair Value 36,467 0
Held-to-maturity, 12 months or longer, Unrealized Losses (1,864) 0
Held-to-maturity, Total, Estimated Fair Value 42,547 38,304
Held-to-maturity, total, unrealized losses (1,951) (1,279)
Asset-backed securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less than 12 months, Unrealized Losses (5,058)  
Available-for-sale, 12 months or Longer, Estimated Fair Value 15,309  
Available-for-sale, 12 months or longer, Unrealized Losses (242)  
Available-for-sale, Total, Estimated Fair Value 282,089  
Available-for-sale, Total, Unrealized Losses (5,300)  
Asset-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 266,780 279,486
Available-for-sale, Less than 12 months, Unrealized Losses   (1,489)
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   279,486
Available-for-sale, Total, Unrealized Losses   (1,489)
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 500,533 458,376
Held-to-maturity, Less than 12 months, Unrealized Losses (25,965) (5,967)
Held-to-maturity, 12 months or longer, Estimated Fair Value 173,263 51,019
Held-to-maturity, 12 months or longer, Unrealized Losses (13,933) (1,361)
Held-to-maturity, Total, Estimated Fair Value 673,797 509,395
Held-to-maturity, total, unrealized losses (39,898) (7,328)
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 102,556 80,726
Available-for-sale, Less than 12 months, Unrealized Losses (8,843) (923)
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 102,556 80,726
Available-for-sale, Total, Unrealized Losses (8,843) (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 469,893 445,399
Held-to-maturity, Less than 12 months, Unrealized Losses (24,938) (5,822)
Held-to-maturity, 12 months or longer, Estimated Fair Value 170,870 50,133
Held-to-maturity, 12 months or longer, Unrealized Losses (13,890) (1,358)
Held-to-maturity, Total, Estimated Fair Value 640,764 495,532
Held-to-maturity, total, unrealized losses (38,828) (7,180)
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 608 2,255
Held-to-maturity, Less than 12 months, Unrealized Losses (2) (41)
Held-to-maturity, 12 months or longer, Estimated Fair Value 2,393 886
Held-to-maturity, 12 months or longer, Unrealized Losses (43) (3)
Held-to-maturity, Total, Estimated Fair Value 3,001 3,141
Held-to-maturity, total, unrealized losses (45) (44)
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 30,032 10,722
Held-to-maturity, Less than 12 months, Unrealized Losses (1,025) (104)
Held-to-maturity, 12 months or longer, Estimated Fair Value 0 0
Held-to-maturity, 12 months or longer, Unrealized Losses 0 0
Held-to-maturity, Total, Estimated Fair Value 30,032 10,722
Held-to-maturity, total, unrealized losses (1,025) (104)
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 203,363 75,329
Held-to-maturity, Less than 12 months, Unrealized Losses (11,481) (1,063)
Held-to-maturity, 12 months or longer, Estimated Fair Value 15,508 4,383
Held-to-maturity, 12 months or longer, Unrealized Losses (1,192) (101)
Held-to-maturity, Total, Estimated Fair Value 218,871 79,712
Held-to-maturity, total, unrealized losses $ (12,673) $ (1,164)