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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 552,155 | $ 549,089
Gross Unrealized Gains | 1,197 | 1,317
Gross Unrealized Losses | 38,443 | 36,887
Allowance for Credit Losses | 0 | 0
Fair Value | 514,909 | 513,519
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,054 | 20,057
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2,385 | 2,217
Allowance for Credit Losses | 0 | 0
Fair Value | 17,669 | 17,840
U.S. Government Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,721 | 3,994
Gross Unrealized Gains | 138 | 157
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 | 0
Fair Value | 3,859 | 4,151
States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 221,121 | 221,624
Gross Unrealized Gains | 15 | 28
Gross Unrealized Losses | 20,268 | 18,530
Allowance for Credit Losses | 0 | 0
Fair Value | 200,868 | 203,122
GSE residential MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 61,468 | 61,669
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 3,512 | 4,037
Allowance for Credit Losses | 0 | 0
Fair Value | 57,956 | 57,632
GSE commercial MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,065 | 4,387
Gross Unrealized Gains | 319 | 356
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 | 0
Fair Value | 4,384 | 4,743
GSE residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 98,182 | 79,284
Gross Unrealized Gains | 0 | 18
Gross Unrealized Losses | 6,738 | 6,200
Allowance for Credit Losses | 0 | 0
Fair Value | 91,444 | 73,102
Non-agency CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 38,208 | 48,162
Gross Unrealized Gains | 238 | 316
Gross Unrealized Losses | 3,736 | 3,809
Allowance for Credit Losses | 0 | 0
Fair Value | 34,710 | 44,669
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 105,216 | 109,786
Gross Unrealized Gains | 487 | 442
Gross Unrealized Losses | 1,804 | 2,094
Allowance for Credit Losses | 0 | 0
Fair Value | 103,899 | 108,134
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 120 | 126
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 | 0
Fair Value | $ 120 | $ 126

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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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