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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Credit Risk Profile, Segregated by Class [Abstract]
Total loans	$ 5,156,701		$ 5,156,701		$ 5,098,058
Current-period Gross writeoffs	133	$ 34	259	$ 195
Commercial [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Total loans	314,273		314,273		286,857
Current-period Gross writeoffs	0	0	4	0
Commercial [Member] | Commercial Real Estate [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	30,673		30,673		47,687
2024/2023	48,801		48,801		54,877
2023/2022	51,978		51,978		74,339
2022/2021	72,163		72,163		22,215
2021/2020	21,751		21,751		15,036
Prior	61,561		61,561		50,977
Revolving Loans Amortized Cost Basis	5,644		5,644		2,169
Revolving Loan Converted to Term	0		0		0
Total loans	292,571		292,571		267,300
2024/2023			0		0
2023/2022			0		0
2022/2021			0		10
2021/2020			0		431
2020/2019			4		0
Prior			0		0
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			4		441
Commercial [Member] | Commercial Real Estate [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	30,673		30,673		47,687
2024/2023	48,801		48,801		54,877
2023/2022	51,978		51,978		73,094
2022/2021	70,571		70,571		22,215
2021/2020	21,751		21,751		15,014
Prior	60,711		60,711		50,052
Revolving Loans Amortized Cost Basis	5,644		5,644		2,169
Revolving Loan Converted to Term	0		0		0
Total loans	290,129		290,129		265,108
Commercial [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0		0
2024/2023	0		0		0
2023/2022	0		0		242
2022/2021	240		240		0
2021/2020	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	240		240		242
Commercial [Member] | Commercial Real Estate [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0		0
2024/2023	0		0		0
2023/2022	0		0		1,003
2022/2021	1,352		1,352		0
2021/2020	0		0		22
Prior	811		811		887
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	2,163		2,163		1,912
Commercial [Member] | Commercial Real Estate [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0		0
2024/2023	0		0		0
2023/2022	0		0		0
2022/2021	0		0		0
2021/2020	0		0		0
Prior	39		39		38
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	39		39		38
Commercial [Member] | Other [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	1,563		1,563		1,855
2024/2023	1,971		1,971		7,417
2023/2022	6,897		6,897		1,796
2022/2021	1,352		1,352		429
2021/2020	264		264		184
Prior	1,854		1,854		2,242
Revolving Loans Amortized Cost Basis	7,801		7,801		5,634
Revolving Loan Converted to Term	0		0		0
Total loans	21,702		21,702		19,557
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]
2025/2024	1,563		1,563		1,842
2024/2023	1,959		1,959		7,417
2023/2022	6,897		6,897		1,796
2022/2021	1,352		1,352		407
2021/2020	260		260		184
Prior	1,854		1,854		2,108
Revolving Loans Amortized Cost Basis	7,764		7,764		5,634
Revolving Loan Converted to Term	0		0		0
Total loans	21,649		21,649		19,388
Commercial [Member] | Other [Member] | Special Mention [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0		0
2024/2023	0		0		0
2023/2022	0		0		0
2022/2021	0		0		0
2021/2020	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	0		0		0
Commercial [Member] | Other [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0		13
2024/2023	12		12		0
2023/2022	0		0		0
2022/2021	0		0		22
2021/2020	4		4		0
Prior	0		0		134
Revolving Loans Amortized Cost Basis	37		37		0
Revolving Loan Converted to Term	0		0		0
Total loans	53		53		169
Commercial [Member] | Other [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0
2024/2023	0		0
2023/2022	0		0
2022/2021	0		0
2021/2020	0		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Revolving Loan Converted to Term	0		0
Total loans	0		0
Real Estate Mortgage - 1 to 4 Family [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Total loans	4,829,750		4,829,750		4,797,563
Current-period Gross writeoffs	17	17	99	134
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	143,583		143,583		313,944
2024/2023	319,376		319,376		399,709
2023/2022	385,441		385,441		536,093
2022/2021	519,430		519,430		822,674
2021/2020	792,665		792,665		682,083
Prior	2,174,846		2,174,846		1,576,122
Revolving Loans Amortized Cost Basis	1,368		1,368		938
Revolving Loan Converted to Term	0		0		0
Total loans	4,336,709		4,336,709		4,331,563
2024/2023			0		194
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			0		0
Prior			99		18
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			99		212
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	143,583		143,583		313,944
2024/2023	319,376		319,376		398,722
2023/2022	384,888		384,888		535,702
2022/2021	519,248		519,248		821,804
2021/2020	791,544		791,544		681,840
Prior	2,162,585		2,162,585		1,563,659
Revolving Loans Amortized Cost Basis	1,368		1,368		938
Revolving Loan Converted to Term	0		0		0
Total loans	4,322,592		4,322,592		4,316,609
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0		0
2024/2023	0		0		987
2023/2022	553		553		391
2022/2021	182		182		870
2021/2020	1,121		1,121		243
Prior	12,261		12,261		12,463
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	14,117		14,117		14,954
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	5,775		5,775		6,621
2024/2023	5,827		5,827		8,586
2023/2022	7,989		7,989		5,509
2022/2021	5,038		5,038		6,490
2021/2020	6,059		6,059		5,066
Prior	26,920		26,920		24,467
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	57,608		57,608		56,739
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]
2025/2024	5,775		5,775		6,621
2024/2023	5,827		5,827		8,586
2023/2022	7,989		7,989		5,354
2022/2021	4,972		4,972		6,490
2021/2020	6,059		6,059		5,066
Prior	26,578		26,578		24,096
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	57,200		57,200		56,213
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0		0
2024/2023	0		0		0
2023/2022	0		0		155
2022/2021	66		66		0
2021/2020	0		0		0
Prior	342		342		371
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	408		408		526
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	1,211		1,211		4,793
2024/2023	3,800		3,800		1,558
2023/2022	1,520		1,520		1,180
2022/2021	1,841		1,841		887
2021/2020	1,870		1,870		46
Prior	19,192		19,192		17,127
Revolving Loans Amortized Cost Basis	405,999		405,999		383,670
Revolving Loan Converted to Term	0		0		0
Total loans	435,433		435,433		409,261
2024/2023			0		0
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
2020/2019			0		0
Prior			0		116
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs			0		116
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	1,211		1,211		4,793
2024/2023	3,800		3,800		1,558
2023/2022	1,520		1,520		1,110
2022/2021	1,771		1,771		887
2021/2020	1,870		1,870		46
Prior	16,808		16,808		14,595
Revolving Loans Amortized Cost Basis	405,798		405,798		383,425
Revolving Loan Converted to Term	0		0		0
Total loans	432,778		432,778		406,414
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0		0
2024/2023	0		0		0
2023/2022	0		0		70
2022/2021	70		70		0
2021/2020	0		0		0
Prior	2,384		2,384		2,532
Revolving Loans Amortized Cost Basis	201		201		245
Revolving Loan Converted to Term	0		0		0
Total loans	2,655		2,655		2,847
Installment [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	1,780		1,780		2,862
2024/2023	2,501		2,501		5,518
2023/2022	4,219		4,219		2,843
2022/2021	2,198		2,198		724
2021/2020	440		440		123
Prior	609		609		540
Revolving Loans Amortized Cost Basis	931		931		1,028
Revolving Loan Converted to Term	0		0		0
Total loans	12,678		12,678		13,638
2024/2023			0		0
2023/2022			76		53
2022/2021			7		47
2021/2020			15		35
2020/2019			20		4
Prior			38		31
Revolving Loans Amortized Cost Basis Writeoffs			0		0
Revolving Loan Converted to Term Writeoffs			0		0
Current-period Gross writeoffs	116	$ 17	156	$ 61	170
Installment [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	1,780		1,780		2,846
2024/2023	2,501		2,501		5,513
2023/2022	4,215		4,215		2,788
2022/2021	2,164		2,164		705
2021/2020	433		433		123
Prior	608		608		505
Revolving Loans Amortized Cost Basis	931		931		1,028
Revolving Loan Converted to Term	0		0		0
Total loans	12,632		12,632		13,508
Installment [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2025/2024	0		0		16
2024/2023	0		0		5
2023/2022	4		4		55
2022/2021	34		34		19
2021/2020	7		7		0
Prior	1		1		35
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	$ 46		$ 46		$ 130