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
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Investment securities available-for-sale [Abstract]
Amortized cost	$ 677,051		$ 636,092
Unrealized gains	583		4,798
Unrealized losses	(32,479)		(8,677)
Estimated fair value	645,155		632,213
Proceeds from sales of available-for-sale securities	0	$ 3,643
Gross realized gains from sales/calls of available-for-sale securities	0	25
Gross realized losses from sales/calls of available-for-sale securities	0	$ 35
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	108,594		86,534
Unrealized gains	126		388
Unrealized losses	(3,189)		(711)
Estimated fair value	105,531		86,211
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	110,716		104,106
Unrealized gains	39		330
Unrealized losses	(5,453)		(1,826)
Estimated fair value	105,302		102,610
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	45,636		44,842
Unrealized gains	285		1,444
Unrealized losses	(2,800)		(301)
Estimated fair value	43,121		45,985
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	129,553		137,872
Unrealized gains	22		665
Unrealized losses	(8,999)		(2,885)
Estimated fair value	120,576		135,652
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	282,552		262,738
Unrealized gains	111		1,971
Unrealized losses	(12,038)		(2,954)
Estimated fair value	$ 270,625		$ 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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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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Amount 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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Amount of realized gain 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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