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SECURITIES - Summary of Available For Sale and Held to Maturity Securities (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | $ 1,204,415,000 | $ 1,226,319,000
Gross Unrealized Gain | 107,000 | 183,000
Gross Unrealized Losses | (190,041,000) | (174,774,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 1,014,481,000 | 1,051,728,000
U.S. government sponsored agencies |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 144,693,000 | 146,692,000
Gross Unrealized Gain | 0 | 0
Gross Unrealized Losses | (28,241,000) | (27,213,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 116,452,000 | 119,479,000
Mortgage-backed securities: residential |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 511,037,000 | 522,275,000
Gross Unrealized Gain | 86,000 | 118,000
Gross Unrealized Losses | (79,105,000) | (74,551,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 432,018,000 | 447,842,000
State and municipal securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 548,685,000 | 557,352,000
Gross Unrealized Gain | 21,000 | 65,000
Gross Unrealized Losses | (82,695,000) | (73,010,000)
Allowance for Credit Losses | 0 | 0
Fair Value | $ 466,011,000 | $ 484,407,000

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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