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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
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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)

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