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Investment Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | $ 1,283,987 | $ 1,289,710 |  |  |
Allowance for Credit Losses | (2,005) | (2,005) | $ (2,000) | $ 0 | $ 0
Net Carrying Amount | 1,281,982 | 1,287,705 |  |  |
Gross Unrealized Gains | 562 | 196 |  |  |
Gross Unrealized (Losses) | (112,063) | (161,755) |  |  |
Estimated Fair Value | 1,170,481 | 1,126,146 |  |  |
U.S. government-sponsored enterprises |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 43,285 | 43,017 |  |  |
Allowance for Credit Losses | 0 | 0 |  |  |
Net Carrying Amount | 43,285 | 43,017 |  |  |
Gross Unrealized Gains | 0 | 0 |  |  |
Gross Unrealized (Losses) | (2,607) | (3,349) |  |  |
Estimated Fair Value | 40,678 | 39,668 |  |  |
U.S. government-sponsored mortgage-backed securities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 130,278 | 135,000 |  |  |
Allowance for Credit Losses | 0 | 0 |  |  |
Net Carrying Amount | 130,278 | 135,000 |  |  |
Gross Unrealized Gains | 106 | 131 |  |  |
Gross Unrealized (Losses) | (4,362) | (3,756) |  |  |
Estimated Fair Value | 126,022 | 131,375 |  |  |
State and political subdivisions |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 1,110,424 | 1,111,693 |  |  |
Allowance for Credit Losses | (2,005) | (2,005) |  |  |
Net Carrying Amount | 1,108,419 | 1,109,688 |  |  |
Gross Unrealized Gains | 456 | 65 |  |  |
Gross Unrealized (Losses) | (105,094) | (154,650) |  |  |
Estimated Fair Value | $ 1,003,781 | $ 955,103 |  |  |

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