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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 437,852 | $ 460,999
Gross Unrealized Gains | 9,531 | 12,054
Gross Unrealized Losses | 2,365 | 6,588
Fair Value | 445,018 | 466,465
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,087 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 256 |
Fair Value | 19,831 |
States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 174,239 | 104,704
Gross Unrealized Gains | 8,072 | 9,091
Gross Unrealized Losses | 790 | 1,125
Fair Value | 181,521 | 112,670
GSE residential MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,552 | 4,197
Gross Unrealized Gains | 80 | 96
Gross Unrealized Losses | 114 | 0
Fair Value | 20,518 | 4,293
GSE residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 69,922 | 56,856
Gross Unrealized Gains | 921 | 2,226
Gross Unrealized Losses | 656 | 1,071
Fair Value | 70,187 | 58,011
Non-agency CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 25,929 | 16,505
Gross Unrealized Gains | 1 | 413
Gross Unrealized Losses | 273 | 0
Fair Value | 25,657 | 16,918
Private label commercial CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 63,941
Gross Unrealized Gains |  | 57
Gross Unrealized Losses |  | 1,762
Fair Value |  | 62,236
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 126,726 | 214,425
Gross Unrealized Gains | 457 | 171
Gross Unrealized Losses | 276 | 2,630
Fair Value | 126,907 | 211,966
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 397 | 371
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 397 | $ 371

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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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