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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | $ 1,454,043 | $ 1,332,467
Gross unrealized gains |  | 2,806 | 3,658
Gross unrealized losses |  | 51,628 | 39,831
Securities AFS, at estimated fair value |  | 1,405,221 | 1,296,294
HELD TO MATURITY |  |  |
Amortized cost |  | 1,306,898 | 1,307,053
Gross unrealized gains |  | 7,104 | 10,571
Gross unrealized losses |  | 161,816 | 151,462
Estimated Fair Value |  | 1,152,186 | 1,166,162
US Treasury Securities |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 139,205 | 139,706
Gross unrealized gains |  | 0 | 19
Gross unrealized losses |  | 19 | 0
Securities AFS, at estimated fair value |  | 139,186 | 139,725
State and political subdivisions |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 594,449 | 603,913
Gross unrealized gains |  | 126 | 362
Gross unrealized losses |  | 46,030 | 35,530
Securities AFS, at estimated fair value |  | 548,545 | 568,745
HELD TO MATURITY |  |  |
Amortized cost |  | 1,039,958 | 1,039,440
Gross unrealized gains |  | 6,658 | 10,070
Gross unrealized losses |  | 138,034 | 126,233
Estimated Fair Value |  | 908,582 | 923,277
Corporate bonds and other |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 14,587 | 14,569
Gross unrealized gains |  | 37 | 31
Gross unrealized losses |  | 915 | 507
Securities AFS, at estimated fair value |  | 13,709 | 14,093
HELD TO MATURITY |  |  |
Amortized cost |  | 146,884 | 146,712
Gross unrealized gains |  | 437 | 488
Gross unrealized losses |  | 12,847 | 15,738
Estimated Fair Value |  | 134,474 | 131,462
Residential |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 700,572 | 569,039
Gross unrealized gains | [1] | 2,613 | 3,202
Gross unrealized losses | [1] | 4,108 | 3,258
Securities AFS, at estimated fair value | [1] | 699,077 | 568,983
HELD TO MATURITY |  |  |
Amortized cost | [1] | 89,952 | 90,619
Gross unrealized gains | [1] | 9 | 13
Gross unrealized losses | [1] | 8,578 | 7,263
Estimated Fair Value | [1] | 81,383 | 83,369
Commercial |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 5,230 | 5,240
Gross unrealized gains | [1] | 30 | 44
Gross unrealized losses | [1] | 556 | 536
Securities AFS, at estimated fair value | [1] | 4,704 | 4,748
HELD TO MATURITY |  |  |
Amortized cost | [1] | 30,104 | 30,282
Gross unrealized gains | [1] | 0 | 0
Gross unrealized losses | [1] | 2,357 | 2,228
Estimated Fair Value | [1] | $ 27,747 | $ 28,054
[1] | All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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