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Investment Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | $ 1,279,095 | $ 1,283,987 |  |
Allowance for Credit Losses | (2,005) | (2,005) | $ (2,005) | $ (2,005)
Net Carrying Amount | 1,277,090 | 1,281,982 |  |
Gross Unrealized Gains | 951 | 562 |  |
Gross Unrealized (Losses) | (83,586) | (112,063) |  |
Estimated Fair Value | 1,194,455 | 1,170,481 |  |
U.S. government-sponsored enterprises |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 43,490 | 43,285 |  |
Allowance for Credit Losses | 0 | 0 |  |
Net Carrying Amount | 43,490 | 43,285 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized (Losses) | (1,712) | (2,607) |  |
Estimated Fair Value | 41,778 | 40,678 |  |
U.S. government-sponsored mortgage-backed securities |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 125,920 | 130,278 |  |
Allowance for Credit Losses | 0 | 0 |  |
Net Carrying Amount | 125,920 | 130,278 |  |
Gross Unrealized Gains | 754 | 106 |  |
Gross Unrealized (Losses) | (2,288) | (4,362) |  |
Estimated Fair Value | 124,386 | 126,022 |  |
State and political subdivisions |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 1,109,685 | 1,110,424 |  |
Allowance for Credit Losses | (2,005) | (2,005) |  |
Net Carrying Amount | 1,107,680 | 1,108,419 |  |
Gross Unrealized Gains | 197 | 456 |  |
Gross Unrealized (Losses) | (79,586) | (105,094) |  |
Estimated Fair Value | $ 1,028,291 | $ 1,003,781 |  |

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