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Securities - Schedule of Estimated Fair Value and Unrealized Losses for Debt Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 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 $ 7,579 $ 184,141
Available-for-sale, Less than 12 months, Unrealized Losses (576) (11,497)
Available-for-sale, 12 months or Longer, Estimated Fair Value 445,629 273,507
Available-for-sale, 12 months or longer, Unrealized Losses (34,234) (34,260)
Available-for-sale, Total, Estimated Fair Value 453,208 457,648
Available-for-sale, Total, Unrealized Losses (34,810) (45,757)
Held-to-maturity, Less than 12 months, Estimated Fair Value 322,415 485,346
Held-to-maturity, Less than 12 months, Unrealized Losses (22,859) (27,725)
Held-to-maturity, 12 months or longer, Estimated Fair Value 707,206 538,583
Held-to-maturity, 12 months or longer, Unrealized Losses (122,387) (88,042)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 1,029,621 1,023,929
Held-to-maturity, total, unrealized losses (145,246) (115,767)
Total securities, Less than 12 months, Estimated Fair Value 329,994 669,487
Total securities, Less than 12 months, Unrealized Losses (23,435) (39,222)
Total securities, 12 months or longer, Estimated Fair Value 1,152,835 812,090
Total securities, 12 months or longer, Unrealized Losses (156,621) (122,302)
Total securities, Estimated Fair Value 1,482,829 1,481,577
Total securities, Unrealized Losses (180,056) (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 1,060 27,232
Available-for-sale, Less than 12 months, Unrealized Losses (11) (450)
Available-for-sale, 12 months or Longer, Estimated Fair Value 63,020 52,782
Available-for-sale, 12 months or longer, Unrealized Losses (7,804) (7,185)
Available-for-sale, Total, Estimated Fair Value 64,080 80,014
Available-for-sale, Total, Unrealized Losses (7,815) (7,635)
Corporate debt securities    
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Held-to-maturity, total, unrealized losses (6,106) (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 6,519 4,735
Available-for-sale, Less than 12 months, Unrealized Losses (565) (193)
Available-for-sale, 12 months or Longer, Estimated Fair Value 2,433 3,437
Available-for-sale, 12 months or longer, Unrealized Losses (567) (563)
Available-for-sale, Total, Estimated Fair Value 8,952 8,172
Available-for-sale, Total, Unrealized Losses (1,132) (756)
Held-to-maturity, Less than 12 months, Estimated Fair Value 38,247 11,783
Held-to-maturity, Less than 12 months, Unrealized Losses (3,634) (598)
Held-to-maturity, 12 months or longer, Estimated Fair Value 22,687 36,152
Held-to-maturity, 12 months or longer, Unrealized Losses (2,472) (3,180)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 60,934 47,935
Held-to-maturity, total, unrealized losses (6,106) (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 0 143,392
Available-for-sale, Less than 12 months, Unrealized Losses 0 (9,179)
Available-for-sale, 12 months or Longer, Estimated Fair Value 290,444 133,481
Available-for-sale, 12 months or longer, Unrealized Losses (5,768) (10,170)
Available-for-sale, Total, Estimated Fair Value 290,444 276,873
Available-for-sale, Total, Unrealized Losses (5,768) (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 274,902 340,071
Held-to-maturity, Less than 12 months, Unrealized Losses (18,828) (15,175)
Held-to-maturity, 12 months or longer, Estimated Fair Value 496,643 405,296
Held-to-maturity, 12 months or longer, Unrealized Losses (93,607) (71,874)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 771,545 745,367
Held-to-maturity, total, unrealized losses (112,435) (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 89,732 83,807
Available-for-sale, 12 months or longer, Unrealized Losses (20,095) (16,342)
Available-for-sale, Total, Estimated Fair Value 89,732 92,589
Available-for-sale, Total, Unrealized Losses (20,095) (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 222,066 297,296
Held-to-maturity, Less than 12 months, Unrealized Losses (13,368) (12,404)
Held-to-maturity, 12 months or longer, Estimated Fair Value 461,630 397,036
Held-to-maturity, 12 months or longer, Unrealized Losses (90,497) (71,182)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 683,696 694,332
Held-to-maturity, total, unrealized losses (103,865) (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 52,836 25,936
Held-to-maturity, Less than 12 months, Unrealized Losses (5,460) (1,150)
Held-to-maturity, 12 months or longer, Estimated Fair Value 16,431 2,062
Held-to-maturity, 12 months or longer, Unrealized Losses (932) (39)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 69,267 27,998
Held-to-maturity, total, unrealized losses (6,392) (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 18,582 6,198
Held-to-maturity, 12 months or longer, Unrealized Losses (2,178) (653)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 18,582 23,037
Held-to-maturity, total, unrealized losses (2,178) (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 (26,705) (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 9,266 133,492
Held-to-maturity, Less than 12 months, Unrealized Losses (397) (11,952)
Held-to-maturity, 12 months or longer, Estimated Fair Value 187,876 97,135
Held-to-maturity, 12 months or longer, Unrealized Losses (26,308) (12,988)
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value1 197,142 230,627
Held-to-maturity, total, unrealized losses $ (26,705) $ (24,940)