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SECURITIES - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
AVAILABLE FOR SALE: |  |  |
Amortized cost |  | $ 1,587,416 | $ 1,332,467
Gross unrealized gain |  | 1,210 | 3,658
Gross unrealized loss |  | 54,732 | 39,831
Securities available for sale, at estimated fair value |  | 1,533,894 | 1,296,294
HELD TO MATURITY: |  |  |
Amortized Cost |  | 1,279,234 | 1,307,053
Gross unrealized gains |  | 4,029 | 10,571
Gross unrealized losses |  | 169,781 | 151,462
Estimated fair value |  | 1,113,482 | 1,166,162
US Treasury Securities |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost |  | 173,880 | 139,706
Gross unrealized gain |  | 76 | 19
Gross unrealized loss |  | 0 | 0
Securities available for sale, at estimated fair value |  | 173,956 | 139,725
State and Political Subdivisions |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost |  | 458,013 | 603,913
Gross unrealized gain |  | 36 | 362
Gross unrealized loss |  | 43,717 | 35,530
Securities available for sale, at estimated fair value |  | 414,332 | 568,745
HELD TO MATURITY: |  |  |
Amortized Cost |  | 1,040,912 | 1,039,440
Gross unrealized gains |  | 4,004 | 10,070
Gross unrealized losses |  | 152,697 | 126,233
Estimated fair value |  | 892,219 | 923,277
Corporate bonds and other |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost |  | 14,646 | 14,569
Gross unrealized gain |  | 263 | 31
Gross unrealized loss |  | 401 | 507
Securities available for sale, at estimated fair value |  | 14,508 | 14,093
HELD TO MATURITY: |  |  |
Amortized Cost |  | 124,095 | 146,712
Gross unrealized gains |  | 17 | 488
Gross unrealized losses |  | 6,553 | 15,738
Estimated fair value |  | 117,559 | 131,462
Residential |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost | [1] | 935,639 | 569,039
Gross unrealized gain | [1] | 835 | 3,202
Gross unrealized loss | [1] | 10,088 | 3,258
Securities available for sale, at estimated fair value | [1] | 926,386 | 568,983
HELD TO MATURITY: |  |  |
Amortized Cost | [1] | 84,660 | 90,619
Gross unrealized gains | [1] | 8 | 13
Gross unrealized losses | [1] | 8,549 | 7,263
Estimated fair value | [1] | 76,119 | 83,369
Commercial |  |  |
AVAILABLE FOR SALE: |  |  |
Amortized cost | [1] | 5,238 | 5,240
Gross unrealized gain | [1] | 0 | 44
Gross unrealized loss | [1] | 526 | 536
Securities available for sale, at estimated fair value | [1] | 4,712 | 4,748
HELD TO MATURITY: |  |  |
Amortized Cost | [1] | 29,567 | 30,282
Gross unrealized gains | [1] | 0 | 0
Gross unrealized losses | [1] | 1,982 | 2,228
Estimated fair value | [1] | $ 27,585 | $ 28,054
[1] | All MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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