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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, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Available-for-sale, Less than 12 months, Estimated Fair Value $ 79,718 $ 184,141
Available-for-sale, Less than 12 months, Unrealized Losses (3,948) (11,497)
Available-for-sale, 12 months or Longer, Estimated Fair Value 372,476 273,507
Available-for-sale, 12 months or longer, Unrealized Losses (33,800) (34,260)
Available-for-sale, Total, Estimated Fair Value 452,194 457,648
Available-for-sale, Total, Unrealized Losses (37,748) (45,757)
Held-to-maturity, Less than 12 months, Estimated Fair Value 187,323 485,346
Held-to-maturity, Less than 12 months, Unrealized Losses (3,294) (27,725)
Held-to-maturity, 12 months or longer, Estimated Fair Value 776,907 538,583
Held-to-maturity, 12 months or longer, Unrealized Losses (98,210) (88,042)
Held-to-maturity, Total, Estimated Fair Value 964,230 1,023,929
Held-to-maturity, total, unrealized losses (101,504) (115,767)
Total securities, Less than 12 months, Estimated Fair Value 267,041 669,487
Total securities, Less than 12 months, Unrealized Losses (7,242) (39,222)
Total securities, 12 months or longer, Estimated Fair Value 1,149,383 812,090
Total securities, 12 months or longer, Unrealized Losses (132,010) (122,302)
Total securities, Estimated Fair Value 1,416,424 1,481,577
Total securities, Unrealized Losses (139,252) (161,524)
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 13,126 27,232
Available-for-sale, Less than 12 months, Unrealized Losses (203) (450)
Available-for-sale, 12 months or Longer, Estimated Fair Value 53,539 52,782
Available-for-sale, 12 months or longer, Unrealized Losses (6,440) (7,185)
Available-for-sale, Total, Estimated Fair Value 66,665 80,014
Available-for-sale, Total, Unrealized Losses (6,643) (7,635)
Corporate debt securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, total, unrealized losses (4,171) (3,778)
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 6,909 4,735
Available-for-sale, Less than 12 months, Unrealized Losses (168) (193)
Available-for-sale, 12 months or Longer, Estimated Fair Value 2,552 3,437
Available-for-sale, 12 months or longer, Unrealized Losses (448) (563)
Available-for-sale, Total, Estimated Fair Value 9,461 8,172
Available-for-sale, Total, Unrealized Losses (616) (756)
Held-to-maturity, Less than 12 months, Estimated Fair Value 6,779 11,783
Held-to-maturity, Less than 12 months, Unrealized Losses (535) (598)
Held-to-maturity, 12 months or longer, Estimated Fair Value 39,610 36,152
Held-to-maturity, 12 months or longer, Unrealized Losses (3,636) (3,180)
Held-to-maturity, Total, Estimated Fair Value 46,389 47,935
Held-to-maturity, total, unrealized losses (4,171) (3,778)
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 59,683 143,392
Available-for-sale, Less than 12 months, Unrealized Losses (3,577) (9,179)
Available-for-sale, 12 months or Longer, Estimated Fair Value 222,086 133,481
Available-for-sale, 12 months or longer, Unrealized Losses (10,871) (10,170)
Available-for-sale, Total, Estimated Fair Value 281,769 276,873
Available-for-sale, Total, Unrealized Losses (14,448) (19,349)
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 150,735 340,071
Held-to-maturity, Less than 12 months, Unrealized Losses (2,475) (15,175)
Held-to-maturity, 12 months or longer, Estimated Fair Value 541,342 405,296
Held-to-maturity, 12 months or longer, Unrealized Losses (75,516) (71,874)
Held-to-maturity, Total, Estimated Fair Value 692,077 745,367
Held-to-maturity, total, unrealized losses (77,991) (87,049)
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 0 8,782
Available-for-sale, Less than 12 months, Unrealized Losses 0 (1,675)
Available-for-sale, 12 months or Longer, Estimated Fair Value 94,299 83,807
Available-for-sale, 12 months or longer, Unrealized Losses (16,041) (16,342)
Available-for-sale, Total, Estimated Fair Value 94,299 92,589
Available-for-sale, Total, Unrealized Losses (16,041) (18,017)
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 132,107 297,296
Held-to-maturity, Less than 12 months, Unrealized Losses (1,962) (12,404)
Held-to-maturity, 12 months or longer, Estimated Fair Value 516,190 397,036
Held-to-maturity, 12 months or longer, Unrealized Losses (73,347) (71,182)
Held-to-maturity, Total, Estimated Fair Value 648,297 694,332
Held-to-maturity, total, unrealized losses (75,309) (83,586)
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 18,628 25,936
Held-to-maturity, Less than 12 months, Unrealized Losses (513) (1,150)
Held-to-maturity, 12 months or longer, Estimated Fair Value 1,990 2,062
Held-to-maturity, 12 months or longer, Unrealized Losses (40) (39)
Held-to-maturity, Total, Estimated Fair Value 20,618 27,998
Held-to-maturity, total, unrealized losses (553) (1,189)
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 0 16,839
Held-to-maturity, Less than 12 months, Unrealized Losses 0 (1,621)
Held-to-maturity, 12 months or longer, Estimated Fair Value 23,162 6,198
Held-to-maturity, 12 months or longer, Unrealized Losses (2,129) (653)
Held-to-maturity, Total, Estimated Fair Value 23,162 23,037
Held-to-maturity, total, unrealized losses (2,129) (2,274)
State, municipal and sovereign debt obligations    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, total, unrealized losses (19,342) (24,940)
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 29,809 133,492
Held-to-maturity, Less than 12 months, Unrealized Losses (284) (11,952)
Held-to-maturity, 12 months or longer, Estimated Fair Value 195,955 97,135
Held-to-maturity, 12 months or longer, Unrealized Losses (19,058) (12,988)
Held-to-maturity, Total, Estimated Fair Value 225,764 230,627
Held-to-maturity, total, unrealized losses $ (19,342) $ (24,940)