Investment Securities, Amortized Cost, Unrealized Gains and Losses and Estimated Fair Values of Investments in Debt and Other Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Investment securities available-for-sale [Abstract]
Amortized cost	$ 636,092	$ 424,981
Unrealized gains	4,798	10,473
Unrealized losses	(8,677)	(374)
Estimated fair value	632,213	435,080
Gross realized gains from sales/calls of available-for-sale securities	322	342
Gross realized losses from sales or calls of available-for-sale securities	543	46
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	86,534	37,910
Unrealized gains	388	982
Unrealized losses	(711)	(1)
Estimated fair value	86,211	38,891
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	104,106	105,506
Unrealized gains	330	1,317
Unrealized losses	(1,826)	(265)
Estimated fair value	102,610	106,558
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	44,842	31,013
Unrealized gains	1,444	1,878
Unrealized losses	(301)	(9)
Estimated fair value	45,985	32,882
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	137,872	71,531
Unrealized gains	665	1,937
Unrealized losses	(2,885)	(8)
Estimated fair value	135,652	73,460
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	262,738	179,021
Unrealized gains	1,971	4,359
Unrealized losses	(2,954)	(91)
Estimated fair value	$ 261,755	$ 183,289