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SECURITIES - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Available-for-sale Securities |  |
Available-for-sale securities, amortized cost | $ 429,883 | $ 334,552
Available-for-sale securities, gross unrealized holding gains | 10,393 | 14,849
Available-for-sale securities, gross unrealized holding losses | (2,419) | (69)
Available-for-sale debt securities, fair value | 437,857 | 349,332
Obligations of the U.S. Treasury |  |
Available-for-sale Securities |  |
Available-for-sale securities, amortized cost | 25,088 | 12,184
Available-for-sale securities, gross unrealized holding gains | 60 | 0
Available-for-sale securities, gross unrealized holding losses | (80) | (2)
Available-for-sale debt securities, fair value | 25,068 | 12,182
Obligations of U.S. Government agencies |  |
Available-for-sale Securities |  |
Available-for-sale securities, amortized cost | 23,935 | 25,349
Available-for-sale securities, gross unrealized holding gains | 666 | 1,003
Available-for-sale securities, gross unrealized holding losses | (289) | (8)
Available-for-sale debt securities, fair value | 24,312 | 26,344
Obligations Of States And Political Subdivisions Tax Exempt |  |
Available-for-sale Securities |  |
Available-for-sale securities, amortized cost | 135,362 | 116,427
Available-for-sale securities, gross unrealized holding gains | 4,390 | 6,000
Available-for-sale securities, gross unrealized holding losses | (508) | (26)
Available-for-sale debt securities, fair value | 139,244 | 122,401
Obligations Of States And Political Subdivisions Taxable |  |
Available-for-sale Securities |  |
Available-for-sale securities, amortized cost | 69,426 | 45,230
Available-for-sale securities, gross unrealized holding gains | 1,516 | 2,246
Available-for-sale securities, gross unrealized holding losses | (449) | (24)
Available-for-sale debt securities, fair value | 70,493 | 47,452
Residential Passthrough Securities |  |
Available-for-sale Securities |  |
Available-for-sale securities, amortized cost | 59,920 | 36,853
Available-for-sale securities, gross unrealized holding gains | 978 | 1,323
Available-for-sale securities, gross unrealized holding losses | (269) | 0
Available-for-sale debt securities, fair value | 60,629 | 38,176
Residential Collateralized Mortgage Obligations |  |
Available-for-sale Securities |  |
Available-for-sale securities, amortized cost | 43,811 | 56,048
Available-for-sale securities, gross unrealized holding gains | 820 | 1,428
Available-for-sale securities, gross unrealized holding losses | (38) | (9)
Available-for-sale debt securities, fair value | 44,593 | 57,467
Commercial Mortgage Backed Securities |  |
Available-for-sale Securities |  |
Available-for-sale securities, amortized cost | 72,341 | 42,461
Available-for-sale securities, gross unrealized holding gains | 1,963 | 2,849
Available-for-sale securities, gross unrealized holding losses | (786) | 0
Available-for-sale debt securities, fair value | $ 73,518 | $ 45,310

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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=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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