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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 548,305 | $ 466,806
Gross Unrealized Gains | 2,035 | 9,487
Gross Unrealized Losses | 20,610 | 3,855
Fair Value | 529,730 | 472,438
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,081 | 20,084
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,543 | 382
Fair Value | 18,538 | 19,702
States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 244,922 | 185,437
Gross Unrealized Gains | 1,984 | 8,606
Gross Unrealized Losses | 9,346 | 673
Fair Value | 237,560 | 193,370
GSE residential MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 61,239 | 41,260
Gross Unrealized Gains | 0 | 44
Gross Unrealized Losses | 2,010 | 578
Fair Value | 59,229 | 40,726
GSE residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 74,023 | 66,430
Gross Unrealized Gains | 48 | 436
Gross Unrealized Losses | 3,044 | 944
Fair Value | 71,027 | 65,922
Non-agency CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 29,832 | 30,676
Gross Unrealized Gains | 3 | 0
Gross Unrealized Losses | 2,832 | 978
Fair Value | 27,003 | 29,698
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 117,805 | 122,520
Gross Unrealized Gains | 0 | 401
Gross Unrealized Losses | 1,835 | 300
Fair Value | 115,970 | 122,621
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 403 | 399
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 403 | $ 399

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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