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INVESTMENT SECURITIES AVAILABLE FOR SALE (Schedule of Amortized Cost and Approximate 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]
Amortized Cost	$ 885,626	$ 615,396
Gross Unrealized Gains	6,935	8,768
Gross Unrealized Losses	(17,260)	(1,475)
Fair Value	875,301	622,689
U.S. Government-Sponsored Agencies [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	229,199	84,424
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(7,862)	(655)
Fair Value	221,337	83,771
Mortgage-Backed Securities-Residential [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	598,088	467,915
Gross Unrealized Gains	6,786	8,604
Gross Unrealized Losses	(8,254)	(461)
Fair Value	596,620	476,058
SBA Pool Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	47,372	49,457
Gross Unrealized Gains	15	31
Gross Unrealized Losses	(1,144)	(359)
Fair Value	46,243	49,129
State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	7,967	7,987
Gross Unrealized Gains	86	102
Gross Unrealized Losses	0	0
Fair Value	8,053	8,089
Corporate Bond [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	3,000	3,000
Gross Unrealized Gains	48	29
Gross Unrealized Losses	0	0
Fair Value	$ 3,048	3,029
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		2,613
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		$ 2,613

X

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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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