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SECURITIES - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
AVAILABLE FOR SALE: |  |  |
Amortized cost |  | $ 1,332,467 | $ 1,387,874
Gross unrealized gain |  | 3,658 | 1,282
Gross unrealized loss |  | 39,831 | 90,142
Securities available for sale, at estimated fair value |  | 1,296,294 | 1,299,014
HELD TO MATURITY: |  |  |
Amortized Cost |  | 1,307,053 | 1,326,729
Gross unrealized gains |  | 10,571 | 4,565
Gross unrealized losses |  | 151,462 | 182,138
Estimated fair value |  | 1,166,162 | 1,149,156
US Treasury Securities |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost |  | 139,706 |
Gross unrealized gain |  | 19 |
Gross unrealized loss |  | 0 |
Securities available for sale, at estimated fair value |  | 139,725 |
State and Political Subdivisions |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost |  | 603,913 | 1,039,453
Gross unrealized gain |  | 362 | 956
Gross unrealized loss |  | 35,530 | 75,557
Securities available for sale, at estimated fair value |  | 568,745 | 964,852
HELD TO MATURITY: |  |  |
Amortized Cost |  | 1,039,440 | 1,037,556
Gross unrealized gains |  | 10,070 | 3,969
Gross unrealized losses |  | 126,233 | 163,283
Estimated fair value |  | 923,277 | 878,242
Corporate bonds and other |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost |  | 14,569 | 8,692
Gross unrealized gain |  | 31 | 26
Gross unrealized loss |  | 507 | 14
Securities available for sale, at estimated fair value |  | 14,093 | 8,704
HELD TO MATURITY: |  |  |
Amortized Cost |  | 146,712 | 152,552
Gross unrealized gains |  | 488 | 575
Gross unrealized losses |  | 15,738 | 7,993
Estimated fair value |  | 131,462 | 145,134
Residential |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost | [1] | 569,039 | 328,400
Gross unrealized gain | [1] | 3,202 | 250
Gross unrealized loss | [1] | 3,258 | 13,623
Securities available for sale, at estimated fair value | [1] | 568,983 | 315,027
HELD TO MATURITY: |  |  |
Amortized Cost | [1] | 90,619 | 93,796
Gross unrealized gains | [1] | 13 | 21
Gross unrealized losses | [1] | 7,263 | 8,343
Estimated fair value | [1] | 83,369 | 85,474
Commercial |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost | [1] | 5,240 | 11,329
Gross unrealized gain | [1] | 44 | 50
Gross unrealized loss | [1] | 536 | 948
Securities available for sale, at estimated fair value | [1] | 4,748 | 10,431
HELD TO MATURITY: |  |  |
Amortized Cost | [1] | 30,282 | 42,825
Gross unrealized gains | [1] | 0 | 0
Gross unrealized losses | [1] | 2,228 | 2,519
Estimated fair value | [1] | $ 28,054 | $ 40,306
[1] | All MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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