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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 | Dec. 31, 2023 USD ($) position | Dec. 31, 2022 USD ($) position
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Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 146,416 | $ 2,108,595
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3,240) | (256,382)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,145,336 | 477,373
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (298,236) | (89,665)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,291,752 | 2,585,968
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (301,476) | $ (346,047)
Debt securities, available for sale, number of positions | position | 727 | 782,000,000
Held to Maturity |  |
Estimated Fair Value, Less Than 12 Months | $ 0 | $ 504,922
Unrealized Losses, Less Than 12 Months | 0 | (38,304)
Estimated Fair Value, 12 Months or Longer | 1,072,207 | 620,127
Unrealized Losses, 12 Months or Longer | (195,715) | (157,903)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 1,072,207 | 1,125,049
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (195,715) | $ (196,207)
Debt securities, held-to-maturity, number of positions | position | 180 | 180,000,000
U.S. Government securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 96,906
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (2,814)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 42,161 | 121,579
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (314) | (4,841)
Debt Securities, Available-for-sale, Unrealized Loss Position | 42,161 | 218,485
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (314) | (7,655)
US Government Agencies Debt Securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 1,008
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (42)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,010 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (28) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,010 | 1,008
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (28) | (42)
State and municipal securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 76,155 | 995,122
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (858) | (157,397)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 917,274 | 61,089
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (128,789) | (21,419)
Debt Securities, Available-for-sale, Unrealized Loss Position | 993,429 | 1,056,211
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (129,647) | (178,816)
Corporate debt securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 42,945 | 376,398
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,326) | (31,333)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 370,523 | 37,157
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (39,310) | (6,150)
Debt Securities, Available-for-sale, Unrealized Loss Position | 413,468 | 413,555
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (40,636) | (37,483)
Collateralized mortgage obligations |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 113,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (7,650)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 111,434 | 20,842
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (11,390) | (5,472)
Debt Securities, Available-for-sale, Unrealized Loss Position | 111,434 | 134,033
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (11,390) | (13,122)
Residential mortgage-backed securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 409 | 154,861
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3) | (18,301)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 195,453 | 55,293
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (26,482) | (11,546)
Debt Securities, Available-for-sale, Unrealized Loss Position | 195,862 | 210,154
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (26,485) | (29,847)
Held to Maturity |  |
Estimated Fair Value, Less Than 12 Months | 0 | 246,667
Unrealized Losses, Less Than 12 Months | 0 | (14,275)
Estimated Fair Value, 12 Months or Longer | 355,270 | 153,178
Unrealized Losses, 12 Months or Longer | (51,805) | (43,205)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 355,270 | 399,845
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | (51,805) | (57,480)
Commercial mortgage-backed securities |  |
Available for Sale |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 26,907 | 371,109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,053) | (38,845)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 507,481 | 181,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (91,923) | (40,237)
Debt Securities, Available-for-sale, Unrealized Loss Position | 534,388 | 552,522
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (92,976) | (79,082)
Held to Maturity |  |
Estimated Fair Value, Less Than 12 Months | 0 | 258,255
Unrealized Losses, Less Than 12 Months | 0 | (24,029)
Estimated Fair Value, 12 Months or Longer | 716,937 | 466,949
Unrealized Losses, 12 Months or Longer | (143,910) | (114,698)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 716,937 | 725,204
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (143,910) | $ (138,727)

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