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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 845,869 | $ 549,089 |
Gross Unrealized Gains | 9,513 | 1,317 |
Gross Unrealized Losses | 28,554 | 36,887 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | 826,828 | 513,519 |
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 20,047 | 20,057 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 1,674 | 2,217 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | 18,373 | 17,840 | $ 19,900
U.S. Government Agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 3,249 | 3,994 |
Gross Unrealized Gains | 123 | 157 |
Gross Unrealized Losses | 0 | 0 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | 3,372 | 4,151 |
States and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 220,909 | 221,624 |
Gross Unrealized Gains | 301 | 28 |
Gross Unrealized Losses | 15,110 | 18,530 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | 206,100 | 203,122 |
GSE residential MBSs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 149,806 | 61,669 |
Gross Unrealized Gains | 3,378 | 0 |
Gross Unrealized Losses | 2,823 | 4,037 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | 150,361 | 57,632 |
GSE commercial MBSs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 9,164 | 4,387 |
Gross Unrealized Gains | 461 | 356 |
Gross Unrealized Losses | 1 | 0 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | 9,624 | 4,743 |
GSE residential CMOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 314,857 | 79,284 |
Gross Unrealized Gains | 4,349 | 18 |
Gross Unrealized Losses | 5,081 | 6,200 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | 314,125 | 73,102 |
Non-agency CMOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 33,698 | 48,162 |
Gross Unrealized Gains | 306 | 316 |
Gross Unrealized Losses | 2,772 | 3,809 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | 31,232 | 44,669 |
Asset-backed |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 92,009 | 109,786 |
Gross Unrealized Gains | 552 | 442 |
Gross Unrealized Losses | 1,093 | 2,094 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | 91,468 | 108,134 |
Corporate debt |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,932 |  |
Gross Unrealized Gains | 43 |  |
Gross Unrealized Losses | 0 |  |
Allowance for Credit Losses | 0 |  |
Fair Value | 1,975 |  |
Other |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 198 | 126 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Allowance for Credit Losses | 0 | 0 |
Fair Value | $ 198 | $ 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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