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Securities - Schedule of Debt Securities Components (Details) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | $ 1,517,550,000 | $ 1,587,416,000
Gross unrealized gains |  | 8,272,000 | 1,210,000
Gross unrealized losses |  | 68,698,000 | 54,732,000
Less: Allowance for Credit Losses |  | 0 | 0
Securities AFS, at estimated fair value |  | 1,457,124,000 | 1,533,894,000
HELD TO MATURITY |  |  |
Amortized Cost |  | 1,272,961,000 | 1,279,234,000
Gross unrealized gains |  | 555,000 | 4,029,000
Gross unrealized losses |  | 192,139,000 | 169,781,000
Estimated Fair Value |  | 1,081,377,000 | 1,113,482,000
Less: Allowance for Credit Losses |  | 55,000 | 0
Net Carrying Amount |  | 1,272,906,000 | 1,279,234,000
US Treasury Securities |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 134,385,000 | 173,880,000
Gross unrealized gains |  | 0 | 76,000
Gross unrealized losses |  | 6,000 | 0
Less: Allowance for Credit Losses |  | 0 | 0
Securities AFS, at estimated fair value |  | 134,379,000 | 173,956,000
State and political subdivisions |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 453,026,000 | 458,013,000
Gross unrealized gains |  | 27,000 | 36,000
Gross unrealized losses |  | 64,443,000 | 43,717,000
Less: Allowance for Credit Losses |  | 0 | 0
Securities AFS, at estimated fair value |  | 388,610,000 | 414,332,000
HELD TO MATURITY |  |  |
Amortized Cost |  | 1,041,998,000 | 1,040,912,000
Gross unrealized gains |  | 185,000 | 4,004,000
Gross unrealized losses |  | 180,070,000 | 152,697,000
Estimated Fair Value |  | 862,113,000 | 892,219,000
Less: Allowance for Credit Losses |  | 26,000 | 0
Net Carrying Amount |  | 1,041,972,000 | 1,040,912,000
Corporate bonds and other |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 17,436,000 | 14,646,000
Gross unrealized gains |  | 187,000 | 263,000
Gross unrealized losses |  | 398,000 | 401,000
Less: Allowance for Credit Losses |  | 0 | 0
Securities AFS, at estimated fair value |  | 17,225,000 | 14,508,000
HELD TO MATURITY |  |  |
Amortized Cost |  | 120,415,000 | 124,095,000
Gross unrealized gains |  | 358,000 | 17,000
Gross unrealized losses |  | 4,472,000 | 6,553,000
Estimated Fair Value |  | 116,301,000 | 117,559,000
Less: Allowance for Credit Losses |  | 29,000 | 0
Net Carrying Amount |  | 120,386,000 | 124,095,000
Residential |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 907,499,000 | 935,639,000
Gross unrealized gains | [1] | 7,999,000 | 835,000
Gross unrealized losses | [1] | 3,433,000 | 10,088,000
Less: Allowance for Credit Losses |  | 0 | 0
Securities AFS, at estimated fair value | [1] | 912,065,000 | 926,386,000
HELD TO MATURITY |  |  |
Amortized Cost | [1] | 81,350,000 | 84,660,000
Gross unrealized gains | [1] | 12,000 | 8,000
Gross unrealized losses | [1] | 6,192,000 | 8,549,000
Estimated Fair Value | [1] | 75,170,000 | 76,119,000
Less: Allowance for Credit Losses |  | 0 | 0
Net Carrying Amount |  | 81,350,000 | 84,660,000
Commercial |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 5,204,000 | 5,238,000
Gross unrealized gains | [1] | 59,000 | 0
Gross unrealized losses | [1] | 418,000 | 526,000
Less: Allowance for Credit Losses |  | 0 | 0
Securities AFS, at estimated fair value | [1] | 4,845,000 | 4,712,000
HELD TO MATURITY |  |  |
Amortized Cost | [1] | 29,198,000 | 29,567,000
Gross unrealized gains | [1] | 0 | 0
Gross unrealized losses | [1] | 1,405,000 | 1,982,000
Estimated Fair Value | [1] | 27,793,000 | 27,585,000
Less: Allowance for Credit Losses |  | 0 | 0
Net Carrying Amount |  | $ 29,198,000 | $ 29,567,000
[1] | All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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