INVESTMENT SECURITIES (Schedule of amortized cost and fair value of securities available-for-sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, at fair value	$ 479,988	$ 266,096
Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	483,575	262,749
Gross Unrealized/Unrecognized Gains	2,368	3,596
Gross Unrealized/Unrecognized Losses	(5,955)	(249)
Investment securities available for sale, at fair value	479,988	266,096
Available-for-sale Securities \| Residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	368,776	192,163
Gross Unrealized/Unrecognized Gains	1,540	2,599
Gross Unrealized/Unrecognized Losses	(3,546)	(74)
Investment securities available for sale, at fair value	366,770	194,688
Available-for-sale Securities \| Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	29,895	32,589
Gross Unrealized/Unrecognized Gains	828	997
Gross Unrealized/Unrecognized Losses	(271)	(94)
Investment securities available for sale, at fair value	30,452	33,492
Available-for-sale Securities \| Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,002
Gross Unrealized/Unrecognized Gains	0
Gross Unrealized/Unrecognized Losses	(29)
Investment securities available for sale, at fair value	4,973
Available-for-sale Securities \| U.S. Government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	67,993	37,997
Gross Unrealized/Unrecognized Gains	0	0
Gross Unrealized/Unrecognized Losses	(1,570)	(81)
Investment securities available for sale, at fair value	66,423	$ 37,916
Available-for-sale Securities \| Securities issued by states and political subdivisions in the U.S
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,909
Gross Unrealized/Unrecognized Gains	0
Gross Unrealized/Unrecognized Losses	(539)
Investment securities available for sale, at fair value	$ 11,370

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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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).

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Amortized cost of 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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