Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	$ 36,332	$ 35,524	$ 36,515	$ 35,273
Loans charged-off	(737)	(479)	(1,370)	(1,034)
Recoveries of loans charged-off	430	516	792	1,056
Net loans (charged-off) recovered	(307)	37	(578)	22
Provision for (reversal of) loan losses	278	(112)	366	154
Balance at end of period	36,303	35,449	36,303	35,449
Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	3,152	3,604	3,164	3,787
Loans charged-off	(63)	0	(63)	0
Recoveries of loans charged-off	0	1	1	1
Net loans (charged-off) recovered	(63)	1	(62)	1
Provision for (reversal of) loan losses	306	(206)	293	(389)
Balance at end of period	3,395	3,399	3,395	3,399
1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,314	1,982	2,173	1,866
Loans charged-off	(22)	0	(71)	0
Recoveries of loans charged-off	41	53	46	92
Net loans (charged-off) recovered	19	53	(25)	92
Provision for (reversal of) loan losses	327	(11)	512	66
Balance at end of period	2,660	2,024	2,660	2,024
Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	28,721	27,225	28,701	26,980
Loans charged-off	0	0	0	0
Recoveries of loans charged-off	1	34	1	81
Net loans (charged-off) recovered	1	34	1	81
Provision for (reversal of) loan losses	(710)	(38)	(690)	160
Balance at end of period	28,012	27,221	28,012	27,221
Commercial loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	1,901	2,454	2,235	2,397
Loans charged-off	(260)	(46)	(369)	(177)
Recoveries of loans charged-off	143	114	203	330
Net loans (charged-off) recovered	(117)	68	(166)	153
Provision for (reversal of) loan losses	233	36	(52)	8
Balance at end of period	2,017	2,558	2,017	2,558
Municipal loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	44	48	45	47
Loans charged-off	0	0	0	0
Recoveries of loans charged-off	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Provision for (reversal of) loan losses	(7)	(2)	(8)	(1)
Balance at end of period	37	46	37	46
Loans to individuals
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	200	211	197	196
Loans charged-off	(392)	(433)	(867)	(857)
Recoveries of loans charged-off	245	314	541	552
Net loans (charged-off) recovered	(147)	(119)	(326)	(305)
Provision for (reversal of) loan losses	129	109	311	310
Balance at end of period	$ 182	$ 201	$ 182	$ 201