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INVESTMENT SECURITIES - Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale
Amortized Cost	$ 183,776	$ 142,177
Gross Unrealized Gains	2,259	2,589
Gross Unrealized Losses	875	533
Estimated Fair Value	185,160	144,233
U.S. government agency obligations
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale
Amortized Cost	31,474	33,048
Gross Unrealized Gains	303	387
Gross Unrealized Losses	65	70
Estimated Fair Value	31,712	33,365
Obligations of states and political subdivisions
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale
Amortized Cost	140	140
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	140	140
Mortgage-backed securities
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale
Amortized Cost	71,448	39,454
Gross Unrealized Gains	1,009	1,537
Gross Unrealized Losses	401	0
Estimated Fair Value	72,056	40,991
Corporate debt securities
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale
Amortized Cost	27,752	17,199
Gross Unrealized Gains	446	372
Gross Unrealized Losses	285	109
Estimated Fair Value	27,913	17,462
Corporate asset-based securities
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale
Amortized Cost	35,664	36,039
Gross Unrealized Gains	159	104
Gross Unrealized Losses	114	316
Estimated Fair Value	35,709	35,827
Trust preferred securities
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale
Amortized Cost	17,298	16,297
Gross Unrealized Gains	342	189
Gross Unrealized Losses	10	38
Estimated Fair Value	$ 17,630	$ 16,448

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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).

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