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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2024 USD ($) Security | Dec. 31, 2023 USD ($) Security
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 17 | 56
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 225,420 | $ 146,416
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (805) | $ (3,240)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 604 | 671
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 1,860,821 | $ 2,145,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (249,579) | (298,236)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,086,241 | 2,291,752
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (250,384) | $ (301,476)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 0 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 180 | 180
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | $ 1,064,304 | $ 1,072,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (167,678) | (195,715)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 1,064,304 | 1,072,207
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (167,678) | $ (195,715)
US Government Debt Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security |  | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | $ 42,161
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (314)
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 42,161
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | $ (314)
US Government Agencies Debt Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security |  | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | $ 1,010
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (28)
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 1,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | $ (28)
State and Municipal Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 7 | 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 19,919 | $ 76,155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (138) | $ (858)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 273 | 314
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 790,484 | $ 917,274
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (112,481) | (128,789)
Debt Securities, Available-for-sale, Unrealized Loss Position | 810,403 | 993,429
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (112,619) | $ (129,647)
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 0 | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 42,945
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ (1,326)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 49 | 60
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 271,021 | $ 370,523
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (22,524) | (39,310)
Debt Securities, Available-for-sale, Unrealized Loss Position | 271,021 | 413,468
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (22,524) | $ (40,636)
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 2 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 39,917 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (181) | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 78 | 93
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 91,327 | $ 111,434
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8,537) | (11,390)
Debt Securities, Available-for-sale, Unrealized Loss Position | 131,244 | 111,434
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (8,718) | $ (11,390)
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 8 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 165,584 | $ 409
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (486) | $ (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 69 | 69
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 187,709 | $ 195,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (21,941) | (26,482)
Debt Securities, Available-for-sale, Unrealized Loss Position | 353,293 | 195,862
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (22,427) | $ (26,485)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 0 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 120 | 60
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | $ 328,926 | $ 355,270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (44,387) | (51,805)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 328,926 | 355,270
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (44,387) | $ (51,805)
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 0 | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 26,907
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ (1,053)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 135 | 133
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 520,280 | $ 507,481
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (84,096) | (91,923)
Debt Securities, Available-for-sale, Unrealized Loss Position | 520,280 | 534,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (84,096) | $ (92,976)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 0 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 60 | 120
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | $ 735,378 | $ 716,937
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (123,291) | (143,910)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 735,378 | 716,937
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (123,291) | $ (143,910)

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