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INVESTMENT SECURITIES - Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 57,419 | $ 43,551
Gross Unrealized Gains | 202 | 267
Gross Unrealized Losses | 1,835 | 34
Estimated Fair Value | 55,786 | 43,784
U.S. government agency obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 3,500 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 17 |
Estimated Fair Value | 3,483 |
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 4,600 | 600
Gross Unrealized Gains | 2 | 2
Gross Unrealized Losses | 9 | 0
Estimated Fair Value | 4,593 | 602
Mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 49,319 | 42,951
Gross Unrealized Gains | 200 | 265
Gross Unrealized Losses | 1,809 | 34
Estimated Fair Value | $ 47,710 | $ 43,182

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + Details
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