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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Credit Risk Profile, Segregated by Class [Abstract]
Total loans	$ 5,038,312		$ 5,038,312		$ 5,002,879
Current-period Gross writeoffs	34	$ 91	195	$ 139
Commercial [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Total loans	282,441		282,441		273,515
Current-period Gross writeoffs	0	0	0	0
Commercial [Member] | Commercial Real Estate [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	18,930		18,930		61,148
2023/2022	55,657		55,657		82,339
2022/2021	78,890		78,890		23,940
2021/2020	23,379		23,379		16,695
2020/2019	15,693		15,693		19,835
Prior	58,735		58,735		42,634
Revolving Loans Amortized Cost Basis	3,743		3,743		5,664
Revolving Loan Converted to Term	0		0		0
Total loans	255,027		255,027		252,255
2024/2023			0		0
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			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] | Commercial Real Estate [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	18,930		18,930		61,148
2023/2022	55,657		55,657		82,339
2022/2021	77,623		77,623		23,940
2021/2020	23,379		23,379		16,653
2020/2019	15,662		15,662		19,835
Prior	57,407		57,407		41,153
Revolving Loans Amortized Cost Basis	3,743		3,743		5,664
Revolving Loan Converted to Term	0		0		0
Total loans	252,401		252,401		250,732
Commercial [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0		0
2023/2022	0		0		0
2022/2021	1,267		1,267		0
2021/2020	0		0		42
2020/2019	31		31		0
Prior	530		530		225
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	1,828		1,828		267
Commercial [Member] | Commercial Real Estate [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0		0
2023/2022	0		0		0
2022/2021	0		0		0
2021/2020	0		0		0
2020/2019	0		0		0
Prior	759		759		1,256
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	759		759		1,256
Commercial [Member] | Commercial Real Estate [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0
2023/2022	0		0
2022/2021	0		0
2021/2020	0		0
2020/2019	0		0
Prior	39		39
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total loans	39		39
Commercial [Member] | Other [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	2,061		2,061		7,873
2023/2022	9,052		9,052		2,164
2022/2021	1,989		1,989		2,261
2021/2020	1,662		1,662		1,386
2020/2019	1,178		1,178		321
Prior	2,569		2,569		2,739
Revolving Loans Amortized Cost Basis	8,903		8,903		4,516
Revolving Loan Converted to Term	0		0		0
Total loans	27,414		27,414		21,260
2024/2023			0		0
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			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]
2024/2023	2,061		2,061		7,873
2023/2022	9,052		9,052		2,164
2022/2021	1,989		1,989		1,933
2021/2020	1,348		1,348		1,386
2020/2019	1,178		1,178		321
Prior	2,569		2,569		2,641
Revolving Loans Amortized Cost Basis	8,581		8,581		4,482
Revolving Loan Converted to Term	0		0		0
Total loans	26,778		26,778		20,800
Commercial [Member] | Other [Member] | Special Mention [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0		0
2023/2022	0		0		0
2022/2021	0		0		0
2021/2020	0		0		0
2020/2019	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	37		37		34
Revolving Loan Converted to Term	0		0		0
Total loans	37		37		34
Commercial [Member] | Other [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0		0
2023/2022	0		0		0
2022/2021	0		0		328
2021/2020	0		0		0
2020/2019	0		0		0
Prior	0		0		98
Revolving Loans Amortized Cost Basis	285		285		0
Revolving Loan Converted to Term	0		0		0
Total loans	285		285		426
Commercial [Member] | Other [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0
2023/2022	0		0
2022/2021	0		0
2021/2020	314		314
2020/2019	0		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total loans	314		314
Real Estate Mortgage - 1 to 4 Family [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Total loans	4,740,703		4,740,703		4,712,478
Current-period Gross writeoffs	17	22	134	22
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	136,689		136,689		418,955
2023/2022	416,581		416,581		566,827
2022/2021	552,013		552,013		878,398
2021/2020	849,059		849,059		733,080
2020/2019	708,993		708,993		343,678
Prior	1,649,276		1,649,276		1,366,167
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	4,312,611		4,312,611		4,307,105
2024/2023			0		0
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			0		27
Prior			18		336
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			18		363
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	136,689		136,689		418,891
2023/2022	416,517		416,517		566,617
2022/2021	551,803		551,803		878,015
2021/2020	848,523		848,523		732,851
2020/2019	708,915		708,915		342,559
Prior	1,635,650		1,635,650		1,354,867
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	4,298,097		4,298,097		4,293,800
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0		64
2023/2022	64		64		210
2022/2021	210		210		383
2021/2020	536		536		229
2020/2019	78		78		1,119
Prior	13,626		13,626		11,300
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	14,514		14,514		13,305
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	3,071		3,071		9,660
2023/2022	9,453		9,453		5,963
2022/2021	5,748		5,748		7,770
2021/2020	7,427		7,427		5,668
2020/2019	5,382		5,382		6,542
Prior	26,948		26,948		22,355
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	58,029		58,029		57,958
2024/2023			0		0
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			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]
2024/2023	3,071		3,071		9,660
2023/2022	9,453		9,453		5,963
2022/2021	5,657		5,657		7,770
2021/2020	7,427		7,427		5,668
2020/2019	5,382		5,382		6,542
Prior	26,585		26,585		22,076
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	57,575		57,575		57,679
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0		0
2023/2022	0		0		0
2022/2021	91		91		0
2021/2020	0		0		0
2020/2019	0		0		0
Prior	363		363		279
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	454		454		279
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	2,887		2,887		355
2023/2022	1,211		1,211		641
2022/2021	1,147		1,147		256
2021/2020	695		695		131
2020/2019	299		299		10
Prior	18,018		18,018		18,777
Revolving Loans Amortized Cost Basis	345,806		345,806		327,245
Revolving Loan Converted to Term	0		0		0
Total loans	370,063		370,063		347,415
2024/2023			0		0
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			0		0
Prior			116		8
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			116		8
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	2,887		2,887		355
2023/2022	1,211		1,211		641
2022/2021	1,147		1,147		248
2021/2020	695		695		75
2020/2019	243		243		10
Prior	15,380		15,380		15,964
Revolving Loans Amortized Cost Basis	345,491		345,491		327,059
Revolving Loan Converted to Term	0		0		0
Total loans	367,054		367,054		344,352
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0		0
2023/2022	0		0		0
2022/2021	0		0		8
2021/2020	0		0		56
2020/2019	56		56		0
Prior	2,638		2,638		2,813
Revolving Loans Amortized Cost Basis	315		315		186
Revolving Loan Converted to Term	0		0		0
Total loans	3,009		3,009		3,063
Installment [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	1,586		1,586		8,473
2023/2022	7,019		7,019		4,641
2022/2021	3,720		3,720		1,535
2021/2020	1,121		1,121		360
2020/2019	220		220		261
Prior	561		561		608
Revolving Loans Amortized Cost Basis	941		941		1,008
Revolving Loan Converted to Term	0		0		0
Total loans	15,168		15,168		16,886
2024/2023			0		16
2023/2022			26		67
2022/2021			19		50
2021/2020			0		1
2020/2019			0		21
Prior			16		21
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs	17	$ 69	61	$ 117	176
Installment [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	1,586		1,586		8,473
2023/2022	7,019		7,019		4,592
2022/2021	3,655		3,655		1,484
2021/2020	1,086		1,086		360
2020/2019	219		219		198
Prior	509		509		605
Revolving Loans Amortized Cost Basis	941		941		1,008
Revolving Loan Converted to Term	0		0		0
Total loans	15,015		15,015		16,720
Installment [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2024/2023	0		0		0
2023/2022	0		0		49
2022/2021	65		65		51
2021/2020	35		35		0
2020/2019	1		1		63
Prior	52		52		3
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	$ 153		$ 153		$ 166