INVESTMENT SECURITIES, Amortized Cost, Unrealized Gains and Losses and Estimated Fair Values of Investments in Debt and Other Securities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Investment securities available-for-sale [Abstract]
Amortized cost	$ 684,593		$ 684,593		$ 636,092
Unrealized gains	109		109		4,798
Unrealized losses	(46,937)		(46,937)		(8,677)
Estimated fair value	637,765		637,765		632,213
Proceeds from sales of available-for-sale securities	6,349	$ 15,804	6,349	$ 19,447
Gross realized gains from sales of available-for-sale securities	0	297	0	322
Gross realized losses from sales of available-for-sale securities	152	$ 488	152	$ 523
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	117,097		117,097		86,534
Unrealized gains	7		7		388
Unrealized losses	(4,171)		(4,171)		(711)
Estimated fair value	112,933		112,933		86,211
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	113,506		113,506		104,106
Unrealized gains	1		1		330
Unrealized losses	(7,170)		(7,170)		(1,826)
Estimated fair value	106,337		106,337		102,610
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	53,053		53,053		44,842
Unrealized gains	89		89		1,444
Unrealized losses	(4,807)		(4,807)		(301)
Estimated fair value	48,335		48,335		45,985
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	122,389		122,389		137,872
Unrealized gains	1		1		665
Unrealized losses	(13,585)		(13,585)		(2,885)
Estimated fair value	108,805		108,805		135,652
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	278,548		278,548		262,738
Unrealized gains	11		11		1,971
Unrealized losses	(17,204)		(17,204)		(2,954)
Estimated fair value	$ 261,355		$ 261,355		$ 261,755

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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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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