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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 912,760 | $ 864,920
Gross Unrealized Gains | 7,767 | 1,766
Gross Unrealized Losses | 30,170 | 36,975
Allowance for Credit Losses | 0 | 0
Fair Value | 890,357 | 829,711
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,033 | 20,043
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,230 | 1,980
Allowance for Credit Losses | 0 | 0
Fair Value | 18,803 | 18,063
U.S. Government Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,966 | 2,953
Gross Unrealized Gains | 55 | 100
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 | 0
Fair Value | 2,021 | 3,053
States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 219,331 | 220,418
Gross Unrealized Gains | 243 | 10
Gross Unrealized Losses | 19,461 | 20,400
Allowance for Credit Losses | 0 | 0
Fair Value | 200,113 | 200,028
GSE residential MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 174,647 | 155,793
Gross Unrealized Gains | 2,697 | 52
Gross Unrealized Losses | 2,216 | 4,297
Allowance for Credit Losses | 0 | 0
Fair Value | 175,128 | 151,548
GSE commercial MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,514 | 8,570
Gross Unrealized Gains | 102 | 243
Gross Unrealized Losses | 17 | 21
Allowance for Credit Losses | 0 | 0
Fair Value | 6,599 | 8,792
GSE residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 359,294 | 331,016
Gross Unrealized Gains | 4,045 | 485
Gross Unrealized Losses | 5,153 | 6,809
Allowance for Credit Losses | 0 | 0
Fair Value | 358,186 | 324,692
Non-agency CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 48,105 | 35,548
Gross Unrealized Gains | 156 | 202
Gross Unrealized Losses | 1,136 | 2,466
Allowance for Credit Losses | 0 | 0
Fair Value | 47,125 | 33,284
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 80,705 | 88,450
Gross Unrealized Gains | 419 | 655
Gross Unrealized Losses | 957 | 1,002
Allowance for Credit Losses | 0 | 0
Fair Value | 80,167 | 88,103
Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,944 | 1,935
Gross Unrealized Gains | 50 | 19
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 | 0
Fair Value | 1,994 | 1,954
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 221 | 194
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 | 0
Fair Value | $ 221 | $ 194

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