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v3.25.1

Investment Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | $ 1,271,901 | $ 1,277,209 |  |
Allowance for Credit Losses | (2,005) | (2,005) | $ (2,005) | $ (2,005)
Net Carrying Amount | 1,269,896 | 1,275,204 |  |
Gross Unrealized Gains | 92 | 39 |  |
Gross Unrealized (Losses) | (116,726) | (132,303) |  |
Estimated Fair Value | 1,153,262 | 1,142,940 |  |
U.S. government-sponsored enterprises |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 43,629 | 43,560 |  |
Allowance for Credit Losses | 0 | 0 |  |
Net Carrying Amount | 43,629 | 43,560 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized (Losses) | (2,249) | (3,021) |  |
Estimated Fair Value | 41,380 | 40,539 |  |
U.S. government-sponsored mortgage-backed securities |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 122,617 | 124,169 |  |
Allowance for Credit Losses | 0 | 0 |  |
Net Carrying Amount | 122,617 | 124,169 |  |
Gross Unrealized Gains | 66 | 0 |  |
Gross Unrealized (Losses) | (4,509) | (6,695) |  |
Estimated Fair Value | 118,174 | 117,474 |  |
State and political subdivisions |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 1,105,655 | 1,109,480 |  |
Allowance for Credit Losses | (2,005) | (2,005) |  |
Net Carrying Amount | 1,103,650 | 1,107,475 |  |
Gross Unrealized Gains | 26 | 39 |  |
Gross Unrealized (Losses) | (109,968) | (122,587) |  |
Estimated Fair Value | $ 993,708 | $ 984,927 |  |

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