INVESTMENT SECURITIES - Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale
Amortized Cost	$ 240,906	$ 142,177
Gross Unrealized Gains	3,097	2,589
Gross Unrealized Losses	257	533
Estimated Fair Value	243,746	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	30,126	33,048
Gross Unrealized Gains	612	387
Gross Unrealized Losses	10	70
Estimated Fair Value	30,728	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	125,439	39,454
Gross Unrealized Gains	1,194	1,537
Gross Unrealized Losses	97	0
Estimated Fair Value	126,536	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	34,689	17,199
Gross Unrealized Gains	703	372
Gross Unrealized Losses	97	109
Estimated Fair Value	35,295	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	35,096	36,039
Gross Unrealized Gains	225	104
Gross Unrealized Losses	49	316
Estimated Fair Value	35,272	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	15,416	16,297
Gross Unrealized Gains	363	189
Gross Unrealized Losses	4	38
Estimated Fair Value	$ 15,775	$ 16,448