SECURITIES, Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available for sale [Abstract]
Amortized cost	$ 768,612	$ 775,999
Gross unrealized gains	14,346	27,875
Gross unrealized losses	(5,750)	(787)
Fair value	777,208	803,087
U.S. Government and Agencies [Member]
Available for sale [Abstract]
Amortized cost	0	4,750
Gross unrealized gains	0	3
Gross unrealized losses	0	0
Fair value	0	4,753
State and Municipal [Member]
Available for sale [Abstract]
Amortized cost	263,102	261,023
Gross unrealized gains	6,506	11,704
Gross unrealized losses	(821)	(120)
Fair value	268,787	272,607
Mortgage-backed Securities [Member]
Available for sale [Abstract]
Amortized cost	355,867	359,542
Gross unrealized gains	6,172	14,014
Gross unrealized losses	(4,388)	(194)
Fair value	357,651	373,362
Collateralized Mortgage Obligations [Member]
Available for sale [Abstract]
Amortized cost	107,077	107,175
Gross unrealized gains	0	0
Gross unrealized losses	(449)	(460)
Fair value	106,628	106,715
Asset-backed and Other Amortizing Securities [Member]
Available for sale [Abstract]
Amortized cost	30,566	31,509
Gross unrealized gains	1,347	2,063
Gross unrealized losses	0	0
Fair value	31,913	33,572
Other Securities [Member]
Available for sale [Abstract]
Amortized cost	12,000	12,000
Gross unrealized gains	321	91
Gross unrealized losses	(92)	(13)
Fair value	$ 12,229	$ 12,078

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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