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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
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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 | $ 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)

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