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Investment Securities - Schedule of Gross Unrealized Losses and Fair Value by Length of Time that the Individual Available-For-Sale Securities Have Been in a Continuous Unrealized Loss (Details) $ in Thousands | Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available-for-sale, Number of securities | security | 244 | 244
Investment securities available-for-sale, Less than 12 months, estimated fair value | $ 11,084 | $ 3,084
Investment securities available-for-sale, Less than 12 months, unrealized losses | (65) | (4)
Investment securities available-for-sale, 12 months or greater, estimated fair value | 1,432,105 | 1,493,993
Investment securities available-for-sale, 12 months or greater, unrealized losses | (168,566) | (161,952)
Investment securities available-for-sale, Estimated fair value | 1,443,189 | 1,497,077
Investment securities available-for-sale, Unrealized losses | $ (168,631) | $ (161,956)
Investment securities held-to-maturity, Number of securities | security | 230 | 228
Investment securities held-to-maturity, Less than 12 months, estimated fair value | $ 3,474 | $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses | (63) | 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value | 862,633 | 885,977
Investment securities held-to-maturity, 12 months or greater, unrealized losses | (124,467) | (116,116)
Investment securities held-to-maturity, Estimated Fair Value | 866,107 | 885,977
Investment securities held-to-maturity, Unrealized losses | $ (124,530) | $ (116,116)
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available-for-sale, Number of securities | security | 2 | 2
Investment securities available-for-sale, Less than 12 months, estimated fair value | $ 0 | $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses | 0 | 0
Investment securities available-for-sale, 12 months or greater, estimated fair value | 48,233 | 47,901
Investment securities available-for-sale, 12 months or greater, unrealized losses | (1,686) | (1,993)
Investment securities available-for-sale, Estimated fair value | 48,233 | 47,901
Investment securities available-for-sale, Unrealized losses | $ (1,686) | $ (1,993)
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available-for-sale, Number of securities | security | 76 | 78
Investment securities available-for-sale, Less than 12 months, estimated fair value | $ 2,904 | $ 3,084
Investment securities available-for-sale, Less than 12 months, unrealized losses | (5) | (4)
Investment securities available-for-sale, 12 months or greater, estimated fair value | 636,422 | 668,313
Investment securities available-for-sale, 12 months or greater, unrealized losses | (58,858) | (57,689)
Investment securities available-for-sale, Estimated fair value | 639,326 | 671,397
Investment securities available-for-sale, Unrealized losses | $ (58,863) | $ (57,693)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available-for-sale, Number of securities | security | 151 | 149
Investment securities available-for-sale, Less than 12 months, estimated fair value | $ 8,180 | $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses | (60) | 0
Investment securities available-for-sale, 12 months or greater, estimated fair value | 688,525 | 718,042
Investment securities available-for-sale, 12 months or greater, unrealized losses | (102,206) | (96,684)
Investment securities available-for-sale, Estimated fair value | 696,705 | 718,042
Investment securities available-for-sale, Unrealized losses | $ (102,266) | $ (96,684)
Investment securities held-to-maturity, Number of securities | security | 142 | 142
Investment securities held-to-maturity, Less than 12 months, estimated fair value | $ 0 | $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses | 0 | 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value | 568,040 | 590,063
Investment securities held-to-maturity, 12 months or greater, unrealized losses | (87,348) | (79,980)
Investment securities held-to-maturity, Estimated Fair Value | 568,040 | 590,063
Investment securities held-to-maturity, Unrealized losses | $ (87,348) | $ (79,980)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available-for-sale, Number of securities | security | 13 | 13
Investment securities available-for-sale, Less than 12 months, estimated fair value | $ 0 | $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses | 0 | 0
Investment securities available-for-sale, 12 months or greater, estimated fair value | 48,938 | 49,564
Investment securities available-for-sale, 12 months or greater, unrealized losses | (5,080) | (4,993)
Investment securities available-for-sale, Estimated fair value | 48,938 | 49,564
Investment securities available-for-sale, Unrealized losses | $ (5,080) | $ (4,993)
Investment securities held-to-maturity, Number of securities | security | 16 | 16
Investment securities held-to-maturity, Less than 12 months, estimated fair value | $ 0 | $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses | 0 | 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value | 76,966 | 77,360
Investment securities held-to-maturity, 12 months or greater, unrealized losses | (13,000) | (12,867)
Investment securities held-to-maturity, Estimated Fair Value | 76,966 | 77,360
Investment securities held-to-maturity, Unrealized losses | $ (13,000) | $ (12,867)
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available-for-sale, Number of securities | security | 1 | 1
Investment securities available-for-sale, Less than 12 months, estimated fair value | $ 0 | $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses | 0 | 0
Investment securities available-for-sale, 12 months or greater, estimated fair value | 8,306 | 8,490
Investment securities available-for-sale, 12 months or greater, unrealized losses | (434) | (293)
Investment securities available-for-sale, Estimated fair value | 8,306 | 8,490
Investment securities available-for-sale, Unrealized losses | $ (434) | $ (293)
Investment securities held-to-maturity, Number of securities | security | 42 | 40
Investment securities held-to-maturity, Less than 12 months, estimated fair value | $ 3,474 | $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses | (63) | 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value | 111,740 | 113,031
Investment securities held-to-maturity, 12 months or greater, unrealized losses | (9,726) | (8,540)
Investment securities held-to-maturity, Estimated Fair Value | 115,214 | 113,031
Investment securities held-to-maturity, Unrealized losses | $ (9,789) | $ (8,540)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available-for-sale, Number of securities | security | 1 | 1
Investment securities available-for-sale, Less than 12 months, estimated fair value | $ 0 | $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses | 0 | 0
Investment securities available-for-sale, 12 months or greater, estimated fair value | 1,681 | 1,683
Investment securities available-for-sale, 12 months or greater, unrealized losses | (302) | (300)
Investment securities available-for-sale, Estimated fair value | 1,681 | 1,683
Investment securities available-for-sale, Unrealized losses | $ (302) | $ (300)
Investment securities held-to-maturity, Number of securities | security | 30 | 30
Investment securities held-to-maturity, Less than 12 months, estimated fair value | $ 0 | $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses | 0 | 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value | 105,887 | 105,523
Investment securities held-to-maturity, 12 months or greater, unrealized losses | (14,393) | (14,729)
Investment securities held-to-maturity, Estimated Fair Value | 105,887 | 105,523
Investment securities held-to-maturity, Unrealized losses | $ (14,393) | $ (14,729)

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