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Investment Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | $ 1,282,591 | $ 1,283,987 |  |
Allowance for Credit Losses | (2,005) | (2,005) | $ (2,005) | $ (2,005)
Net Carrying Amount | 1,280,586 | 1,281,982 |  |
Gross Unrealized Gains | 216 | 562 |  |
Gross Unrealized (Losses) | (121,657) | (112,063) |  |
Estimated Fair Value | 1,159,145 | 1,170,481 |  |
U.S. government-sponsored enterprises |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 43,353 | 43,285 |  |
Allowance for Credit Losses | 0 | 0 |  |
Net Carrying Amount | 43,353 | 43,285 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized (Losses) | (3,342) | (2,607) |  |
Estimated Fair Value | 40,011 | 40,678 |  |
U.S. government-sponsored mortgage-backed securities |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 129,077 | 130,278 |  |
Allowance for Credit Losses | 0 | 0 |  |
Net Carrying Amount | 129,077 | 130,278 |  |
Gross Unrealized Gains | 0 | 106 |  |
Gross Unrealized (Losses) | (6,093) | (4,362) |  |
Estimated Fair Value | 122,984 | 126,022 |  |
State and political subdivisions |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 1,110,161 | 1,110,424 |  |
Allowance for Credit Losses | (2,005) | (2,005) |  |
Net Carrying Amount | 1,108,156 | 1,108,419 |  |
Gross Unrealized Gains | 216 | 456 |  |
Gross Unrealized (Losses) | (112,222) | (105,094) |  |
Estimated Fair Value | $ 996,150 | $ 1,003,781 |  |

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