Loan Portfolio and Allowance for Credit Losses - Risk Category of Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loans	$ 311,491		$ 311,491		$ 286,857
Total loans	0	$ 65	4	$ 65
Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loans	4,868,048		4,868,048		4,797,563
Total loans	0	194	99	328
Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	2,449		2,449		2,862
2024/2023	2,244		2,244		5,518
2023/2022	3,738		3,738		2,843
2022/2021	1,903		1,903		724
2021/2020	358		358		123
Prior	691		691		540
Revolving Loans Amortized Cost Basis	848		848		1,028
Revolving Loan Converted to Term	0		0		0
Total loans	12,231		12,231		13,638
2025/2024			8		0
2024/2023			76		53
2023/2022			7		47
2022/2021			20		35
2021/2020			27		4
Prior			40		31
Revolving Loans Amortized Cost Basis			0		0
Revolving Loan Converted to Term			0		0
Total loans	22	$ 59	178	$ 120	170
Commercial Real Estate [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	41,080		41,080		47,687
2024/2023	48,348		48,348		54,877
2023/2022	50,976		50,976		74,339
2022/2021	68,251		68,251		22,215
2021/2020	21,514		21,514		15,036
Prior	58,648		58,648		50,977
Revolving Loans Amortized Cost Basis	5,238		5,238		2,169
Revolving Loan Converted to Term	0		0		0
Total loans	294,055		294,055		267,300
2025/2024			0		0
2024/2023			0		0
2023/2022			0		10
2022/2021			0		431
2021/2020			4		0
Prior			0		0
Revolving Loans Amortized Cost Basis			0		0
Revolving Loan Converted to Term			0		0
Total loans			4		441
Other [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	1,819		1,819		1,855
2024/2023	1,617		1,617		7,417
2023/2022	6,663		6,663		1,796
2022/2021	1,281		1,281		429
2021/2020	199		199		184
Prior	1,751		1,751		2,242
Revolving Loans Amortized Cost Basis	4,106		4,106		5,634
Revolving Loan Converted to Term	0		0		0
Total loans	17,436		17,436		19,557
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
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	249,750		249,750		313,944
2024/2023	317,621		317,621		399,709
2023/2022	379,158		379,158		536,093
2022/2021	508,152		508,152		822,674
2021/2020	773,288		773,288		682,083
Prior	2,127,668		2,127,668		1,576,122
Revolving Loans Amortized Cost Basis	3,168		3,168		938
Revolving Loan Converted to Term	0		0		0
Total loans	4,358,805		4,358,805		4,331,563
2025/2024			0		194
2024/2023			0		0
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
Prior			99		18
Revolving Loans Amortized Cost Basis			0		0
Revolving Loan Converted to Term			0		0
Total loans			99		212
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	12,938		12,938		6,621
2024/2023	5,774		5,774		8,586
2023/2022	7,672		7,672		5,509
2022/2021	4,525		4,525		6,490
2021/2020	5,697		5,697		5,066
Prior	25,343		25,343		24,467
Revolving Loans Amortized Cost Basis	59		59		0
Revolving Loan Converted to Term	0		0		0
Total loans	62,008		62,008		56,739
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
Home Equity Line of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	905		905		4,793
2024/2023	2,427		2,427		1,558
2023/2022	1,437		1,437		1,180
2022/2021	1,216		1,216		887
2021/2020	1,036		1,036		46
Prior	16,296		16,296		17,127
Revolving Loans Amortized Cost Basis	423,918		423,918		383,670
Revolving Loan Converted to Term	0		0		0
Total loans	447,235		447,235		409,261
2025/2024			0		0
2024/2023			0		0
2023/2022			0		0
2022/2021			0		0
2021/2020			0		0
Prior			0		116
Revolving Loans Amortized Cost Basis			0		0
Revolving Loan Converted to Term			0		0
Total loans			0		116
Performing [Member] | Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	2,449		2,449		2,846
2024/2023	2,236		2,236		5,513
2023/2022	3,729		3,729		2,788
2022/2021	1,877		1,877		705
2021/2020	358		358		123
Prior	691		691		505
Revolving Loans Amortized Cost Basis	848		848		1,028
Revolving Loan Converted to Term	0		0		0
Total loans	12,188		12,188		13,508
Performing [Member] | First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	249,750		249,750		313,944
2024/2023	317,621		317,621		398,722
2023/2022	378,605		378,605		535,702
2022/2021	506,947		506,947		821,804
2021/2020	771,900		771,900		681,840
Prior	2,115,577		2,115,577		1,563,659
Revolving Loans Amortized Cost Basis	3,168		3,168		938
Revolving Loan Converted to Term	0		0		0
Total loans	4,343,568		4,343,568		4,316,609
Performing [Member] | Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	12,938		12,938		6,621
2024/2023	5,774		5,774		8,586
2023/2022	7,672		7,672		5,354
2022/2021	4,459		4,459		6,490
2021/2020	5,697		5,697		5,066
Prior	24,985		24,985		24,096
Revolving Loans Amortized Cost Basis	59		59		0
Revolving Loan Converted to Term	0		0		0
Total loans	61,584		61,584		56,213
Performing [Member] | Home Equity Line of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	905		905		4,793
2024/2023	2,427		2,427		1,558
2023/2022	1,437		1,437		1,110
2022/2021	1,216		1,216		887
2021/2020	1,036		1,036		46
Prior	15,373		15,373		14,595
Revolving Loans Amortized Cost Basis	422,360		422,360		383,425
Revolving Loan Converted to Term	0		0		0
Total loans	444,754		444,754		406,414
Nonperforming [Member] | Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	0		0		16
2024/2023	8		8		5
2023/2022	9		9		55
2022/2021	26		26		19
2021/2020	0		0		0
Prior	0		0		35
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	43		43		130
Nonperforming [Member] | First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	0		0		0
2024/2023	0		0		987
2023/2022	553		553		391
2022/2021	1,205		1,205		870
2021/2020	1,388		1,388		243
Prior	12,091		12,091		12,463
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	15,237		15,237		14,954
Nonperforming [Member] | Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [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	358		358		371
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	424		424		526
Nonperforming [Member] | Home Equity Line of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	0		0		0
2024/2023	0		0		0
2023/2022	0		0		70
2022/2021	0		0		0
2021/2020	0		0		0
Prior	923		923		2,532
Revolving Loans Amortized Cost Basis	1,558		1,558		245
Revolving Loan Converted to Term	0		0		0
Total loans	2,481		2,481		2,847
Pass [Member] | Commercial Real Estate [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	41,080		41,080		47,687
2024/2023	47,458		47,458		54,877
2023/2022	50,976		50,976		73,094
2022/2021	67,021		67,021		22,215
2021/2020	21,514		21,514		15,014
Prior	57,855		57,855		50,052
Revolving Loans Amortized Cost Basis	5,238		5,238		2,169
Revolving Loan Converted to Term	0		0		0
Total loans	291,142		291,142		265,108
Pass [Member] | Other [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	1,819		1,819		1,842
2024/2023	1,606		1,606		7,417
2023/2022	6,663		6,663		1,796
2022/2021	1,281		1,281		407
2021/2020	197		197		184
Prior	1,751		1,751		2,108
Revolving Loans Amortized Cost Basis	4,067		4,067		5,634
Revolving Loan Converted to Term	0		0		0
Total loans	17,384		17,384		19,388
Special Mention [Member] | Commercial Real Estate [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	0		0		0
2024/2023	0		0		0
2023/2022	0		0		242
2022/2021	238		238		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	238		238		242
Special Mention [Member] | Other [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [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
Substandard [Member] | Commercial Real Estate [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	0		0		0
2024/2023	890		890		0
2023/2022	0		0		1,003
2022/2021	992		992		0
2021/2020	0		0		22
Prior	793		793		887
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	2,675		2,675		1,912
Substandard [Member] | Other [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
2025/2024	0		0		13
2024/2023	11		11		0
2023/2022	0		0		0
2022/2021	0		0		22
2021/2020	2		2		0
Prior	0		0		134
Revolving Loans Amortized Cost Basis	39		39		0
Revolving Loan Converted to Term	0		0		0
Total loans	52		52		169
Doubtful [Member] | Commercial Real Estate [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [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		38
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loan Converted to Term	0		0		0
Total loans	0		0		$ 38
Doubtful [Member] | Other [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [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