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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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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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