Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	$ 35,449	$ 42,913	$ 35,273	$ 49,006
Loans charged-off	(686)	(940)	(1,720)	(2,262)
Recoveries of loans charged-off	449	437	1,505	1,525
Net loans (charged-off) recovered	(237)	(503)	(215)	(737)
Provision for (reversal of) loan losses	1,294	(4,388)	1,448	(10,247)
Balance at end of period	36,506	38,022	36,506	38,022
Construction Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	3,399	8,018	3,787	6,490
Loans charged-off	0	0	0	0
Recoveries of loans charged-off	0	1	1	2
Net loans (charged-off) recovered	0	1	1	2
Provision for (reversal of) loan losses	136	(3,036)	(253)	(1,509)
Balance at end of period	3,535	4,983	3,535	4,983
1-4 Family Residential Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,024	2,520	1,866	2,270
Loans charged-off	(66)	(35)	(66)	(136)
Recoveries of loans charged-off	4	4	96	71
Net loans (charged-off) recovered	(62)	(31)	30	(65)
Provision for (reversal of) loan losses	44	(543)	110	(259)
Balance at end of period	2,006	1,946	2,006	1,946
Commercial Real Estate Loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	27,221	28,930	26,980	35,709
Loans charged-off	0	0	0	0
Recoveries of loans charged-off	0	12	81	13
Net loans (charged-off) recovered	0	12	81	13
Provision for (reversal of) loan losses	1,273	(684)	1,433	(7,464)
Balance at end of period	28,494	28,258	28,494	28,258
Commercial loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	2,558	3,097	2,397	4,107
Loans charged-off	(192)	(508)	(369)	(943)
Recoveries of loans charged-off	139	74	469	535
Net loans (charged-off) recovered	(53)	(434)	100	(408)
Provision for (reversal of) loan losses	(272)	(103)	(264)	(1,139)
Balance at end of period	2,233	2,560	2,233	2,560
Municipal loans
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	46	47	47	46
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	(2)	(1)	(3)	0
Balance at end of period	44	46	44	46
Loans to individuals
Allowances for Loan Losses [Roll Forward]
Balance at beginning of period	201	301	196	384
Loans charged-off	(428)	(397)	(1,285)	(1,183)
Recoveries of loans charged-off	306	346	858	904
Net loans (charged-off) recovered	(122)	(51)	(427)	(279)
Provision for (reversal of) loan losses	115	(21)	425	124
Balance at end of period	$ 194	$ 229	$ 194	$ 229