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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 553,222 | $ 563,278
Gross Unrealized Gains | 1,259 | 490
Gross Unrealized Losses | 59,319 | 50,040
Allowance for Credit Losses | 0 |
Fair Value | 495,162 | 513,728
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,060 | 20,070
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2,917 | 2,779
Allowance for Credit Losses | 0 |
Fair Value | 17,143 | 17,291
U.S. Government Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,149 | 4,907
Gross Unrealized Gains | 173 | 228
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 |
Fair Value | 4,322 | 5,135
States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 223,807 | 225,825
Gross Unrealized Gains | 0 | 19
Gross Unrealized Losses | 35,690 | 28,430
Allowance for Credit Losses | 0 |
Fair Value | 188,117 | 197,414
GSE residential MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 62,395 | 63,778
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 5,044 | 4,376
Allowance for Credit Losses | 0 |
Fair Value | 57,351 | 59,402
GSE commercial MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,413 |
Gross Unrealized Gains | 365 |
Gross Unrealized Losses | 0 |
Allowance for Credit Losses | 0 |
Fair Value | 4,778 |
GSE residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 80,693 | 75,446
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 8,656 | 7,068
Allowance for Credit Losses | 0 |
Fair Value | 72,037 | 68,378
Non-agency CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 43,772 | 42,298
Gross Unrealized Gains | 274 | 243
Gross Unrealized Losses | 5,067 | 2,783
Allowance for Credit Losses | 0 |
Fair Value | 38,979 | 39,758
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 113,813 | 130,577
Gross Unrealized Gains | 447 | 0
Gross Unrealized Losses | 1,945 | 4,604
Allowance for Credit Losses | 0 |
Fair Value | 112,315 | 125,973
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 120 | 377
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 |
Fair Value | $ 120 | $ 377

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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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