Loan Portfolio and Allowance for Credit Losses, Risk Category of Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Credit Risk Profile, Segregated by Class [Abstract]
Total loans	$ 4,886,811		$ 4,886,811		$ 4,733,201
Current-period Gross writeoffs	91	$ 30	139	$ 77
Commercial [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Total loans	251,434		251,434		231,011
Current-period Gross writeoffs	0	4	0	40
Commercial [Member] | Commercial Real Estate [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	30,169		30,169		79,430
2022/2021	82,912		82,912		29,991
2021/2020	25,662		25,662		18,883
2020/2019	17,805		17,805		22,790
2019/2018	20,990		20,990		16,969
Prior	44,839		44,839		33,837
Revolving Loans Amortized Cost Basis	7,171		7,171		8,022
Revolving Loan Converted to Term	0		0		0
Total loans	229,548		229,548		209,922
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			0		0
2019/2018			0		0
Prior			0		40
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			0		40
Commercial [Member] | Commercial Real Estate [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	30,169		30,169		79,430
2022/2021	82,912		82,912		29,991
2021/2020	25,662		25,662		18,708
2020/2019	17,642		17,642		22,790
2019/2018	20,990		20,990		16,598
Prior	43,174		43,174		32,666
Revolving Loans Amortized Cost Basis	7,171		7,171		8,022
Revolving Loan Converted to Term	0		0		0
Total loans	227,720		227,720		208,205
Commercial [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	0		0		0
2022/2021	0		0		0
2021/2020	0		0		62
2020/2019	53		53		0
2019/2018	0		0		243
Prior	234		234		0
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	287		287		305
Commercial [Member] | Commercial Real Estate [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	0		0		0
2022/2021	0		0		0
2021/2020	0		0		113
2020/2019	110		110		0
2019/2018	0		0		128
Prior	1,431		1,431		1,171
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	1,541		1,541		1,412
Commercial [Member] | Other [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	3,062		3,062		2,972
2022/2021	4,085		4,085		3,187
2021/2020	2,725		2,725		2,273
2020/2019	1,783		1,783		590
2019/2018	510		510		674
Prior	2,790		2,790		2,446
Revolving Loans Amortized Cost Basis	6,931		6,931		8,947
Revolving Loan Converted to Term	0		0		0
Total loans	21,886		21,886		21,089
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			0		0
2019/2018			0		0
Prior			0		0
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			0		0
Commercial [Member] | Other [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	3,062		3,062		2,972
2022/2021	4,085		4,085		2,848
2021/2020	2,394		2,394		2,273
2020/2019	1,783		1,783		590
2019/2018	510		510		674
Prior	2,692		2,692		2,348
Revolving Loans Amortized Cost Basis	6,931		6,931		8,908
Revolving Loan Converted to Term	0		0		0
Total loans	21,457		21,457		20,613
Commercial [Member] | Other [Member] | Special Mention [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	0		0		0
2022/2021	0		0		0
2021/2020	0		0		0
2020/2019	0		0		0
2019/2018	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	0		0		39
Revolving Loan Converted to Term	0		0		0
Total loans	0		0		39
Commercial [Member] | Other [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	0		0		0
2022/2021	0		0		339
2021/2020	331		331		0
2020/2019	0		0		0
2019/2018	0		0		0
Prior	98		98		98
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	429		429		437
Real Estate Mortgage - 1 to 4 Family [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Total loans	4,618,981		4,618,981		4,489,883
Current-period Gross writeoffs	22	12	22	12
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	229,280		229,280		557,981
2022/2021	574,375		574,375		934,250
2021/2020	906,150		906,150		784,592
2020/2019	758,511		758,511		368,981
2019/2018	355,786		355,786		258,277
Prior	1,425,596		1,425,596		1,241,349
Revolving Loans Amortized Cost Basis	2,446		2,446		1,472
Revolving Loan Converted to Term	0		0		0
Total loans	4,252,144		4,252,144		4,146,902
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			0		0
2019/2018			0		0
Prior			22		5
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			22		5
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	229,280		229,280		557,981
2022/2021	574,375		574,375		933,754
2021/2020	905,759		905,759		784,511
2020/2019	757,908		757,908		368,137
2019/2018	354,492		354,492		257,926
Prior	1,412,169		1,412,169		1,228,776
Revolving Loans Amortized Cost Basis	2,446		2,446		1,472
Revolving Loan Converted to Term	0		0		0
Total loans	4,236,429		4,236,429		4,132,557
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	0		0		0
2022/2021	0		0		496
2021/2020	391		391		81
2020/2019	603		603		844
2019/2018	1,294		1,294		351
Prior	13,427		13,427		12,573
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	15,715		15,715		14,345
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	5,673		5,673		6,863
2022/2021	6,384		6,384		9,124
2021/2020	8,452		8,452		6,322
2020/2019	6,028		6,028		7,588
2019/2018	7,059		7,059		5,306
Prior	24,265		24,265		21,346
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	57,861		57,861		56,549
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			0		0
2019/2018			0		0
Prior			0		0
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			0		0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	5,673		5,673		6,863
2022/2021	6,384		6,384		9,124
2021/2020	8,452		8,452		6,322
2020/2019	6,028		6,028		7,588
2019/2018	7,059		7,059		5,240
Prior	23,979		23,979		21,217
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	57,575		57,575		56,354
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	0		0		0
2022/2021	0		0		0
2021/2020	0		0		0
2020/2019	0		0		0
2019/2018	0		0		66
Prior	286		286		129
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	286		286		195
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	781		781		1,369
2022/2021	770		770		1,253
2021/2020	409		409		740
2020/2019	529		529		52
2019/2018	42		42		100
Prior	18,982		18,982		20,488
Revolving Loans Amortized Cost Basis	287,463		287,463		262,430
Revolving Loan Converted to Term	0		0		0
Total loans	308,976		308,976		286,432
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			0		0
2019/2018			0		0
Prior			0		19
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			0		19
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	781		781		1,369
2022/2021	770		770		1,246
2021/2020	409		409		740
2020/2019	529		529		52
2019/2018	42		42		100
Prior	16,861		16,861		18,377
Revolving Loans Amortized Cost Basis	287,155		287,155		262,244
Revolving Loan Converted to Term	0		0		0
Total loans	306,547		306,547		284,128
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	0		0		0
2022/2021	0		0		7
2021/2020	0		0		0
2020/2019	0		0		0
2019/2018	0		0		0
Prior	2,121		2,121		2,111
Revolving Loans Amortized Cost Basis	308		308		186
Revolving Loan Converted to Term	0		0		0
Total loans	2,429		2,429		2,304
Installment [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	5,971		5,971		6,405
2022/2021	5,683		5,683		2,512
2021/2020	1,936		1,936		805
2020/2019	550		550		774
2019/2018	477		477		374
Prior	747		747		309
Revolving Loans Amortized Cost Basis	1,032		1,032		1,128
Revolving Loan Converted to Term	0		0		0
Total loans	16,396		16,396		12,307
2023/2022			0		1
2022/2021			57		47
2021/2020			37		22
2020/2019			6		7
2019/2018			0		2
Prior			17		9
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs	69	$ 14	117	$ 25	88
Installment [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	5,970		5,970		6,385
2022/2021	5,683		5,683		2,495
2021/2020	1,888		1,888		805
2020/2019	550		550		709
2019/2018	404		404		374
Prior	745		745		308
Revolving Loans Amortized Cost Basis	1,032		1,032		1,125
Revolving Loan Converted to Term	0		0		0
Total loans	16,272		16,272		12,201
Installment [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2023/2022	1		1		20
2022/2021	0		0		17
2021/2020	48		48		0
2020/2019	0		0		65
2019/2018	73		73		0
Prior	2		2		1
Revolving Loans Amortized Cost Basis	0		0		3
Revolving Loan Converted to Term	0		0		0
Total loans	$ 124		$ 124		$ 106