Loans, Recorded Investment in Loan Classes Based on Payment Activity, By Origination Year (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
Total loans	$ 2,239,659		$ 2,248,836
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]
Gross charge-offs	674	$ 7
Residential Real Estate [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	2,298		19,082
2023/2022	19,866		94,105
2022/2021	93,362		48,540
2021/2020	47,755		30,336
2020/2019	29,982		18,923
Prior	115,326		99,213
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term	0		0
Total loans	308,589		310,199
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]
2024/2023	0		0
2023/2022	0		0
2022/2021	0		0
2021/2020	0		0
2020/2019	0		0
Prior	0		1
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term	0		0
Gross charge-offs	0		1
Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	2,298		19,082
2023/2022	19,300		93,706
2022/2021	92,970		47,774
2021/2020	47,003		29,940
2020/2019	29,594		18,923
Prior	113,968		97,813
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term	0		0
Total loans	305,133		307,238
Residential Real Estate [Member] | Nonperforming [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	0		0
2023/2022	566		399
2022/2021	392		766
2021/2020	752		396
2020/2019	388		0
Prior	1,358		1,400
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term	0		0
Total loans	3,456		2,961
Home Equity [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	430		3,877
2023/2022	3,887		3,008
2022/2021	2,828		1,886
2021/2020	1,793		1,954
2020/2019	1,851		2,462
Prior	9,727		7,955
Revolving Loans Amortized Cost Basis	28,311		28,286
Revolving Loans Converted to Term	363		363
Total loans	49,190		49,791
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]
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	0		0
Revolving Loans Converted to Term	0		0
Gross charge-offs	0		0
Home Equity [Member] | Performing [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	430		3,877
2023/2022	3,887		3,008
2022/2021	2,828		1,886
2021/2020	1,793		1,954
2020/2019	1,851		2,462
Prior	9,674		7,883
Revolving Loans Amortized Cost Basis	28,245		28,219
Revolving Loans Converted to Term	363		363
Total loans	49,071		49,652
Home Equity [Member] | Nonperforming [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	0		0
2023/2022	0		0
2022/2021	0		0
2021/2020	0		0
2020/2019	0		0
Prior	53		72
Revolving Loans Amortized Cost Basis	66		67
Revolving Loans Converted to Term	0		0
Total loans	119		139
Consumer [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	1,051		1,803
2023/2022	1,592		1,000
2022/2021	865		539
2021/2020	493		477
2020/2019	427		557
Prior	3,817		3,681
Revolving Loans Amortized Cost Basis	44,853		53,254
Revolving Loans Converted to Term	3		5
Total loans	53,101		61,316
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]
2024/2023	0		0
2023/2022	0		0
2022/2021	18		0
2021/2020	0		0
2020/2019	0		1
Prior	0		341
Revolving Loans Amortized Cost Basis	12		23
Revolving Loans Converted to Term	0		0
Gross charge-offs	30		365
Consumer [Member] | Performing [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	1,051		1,803
2023/2022	1,592		979
2022/2021	855		539
2021/2020	493		477
2020/2019	407		557
Prior	2,986		2,988
Revolving Loans Amortized Cost Basis	44,853		53,254
Revolving Loans Converted to Term	3		5
Total loans	52,240		60,602
Consumer [Member] | Nonperforming [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	0		0
2023/2022	0		21
2022/2021	10		0
2021/2020	0		0
2020/2019	20		0
Prior	831		693
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term	0		0
Total loans	861		714
Mortgage, Home Equity, and Consumer [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	3,779		24,762
2023/2022	25,345		98,113
2022/2021	97,055		50,965
2021/2020	50,041		32,767
2020/2019	32,260		21,942
Prior	128,870		110,849
Revolving Loans Amortized Cost Basis	73,164		81,540
Revolving Loans Converted to Term	366		368
Total loans	410,880		421,306
Mortgage, Home Equity, and Consumer [Member] | Performing [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	3,779		24,762
2023/2022	24,779		97,693
2022/2021	96,653		50,199
2021/2020	49,289		32,371
2020/2019	31,852		21,942
Prior	126,628		108,684
Revolving Loans Amortized Cost Basis	73,098		81,473
Revolving Loans Converted to Term	366		368
Total loans	406,444		417,492
Mortgage, Home Equity, and Consumer [Member] | Nonperforming [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
2024/2023	0		0
2023/2022	566		420
2022/2021	402		766
2021/2020	752		396
2020/2019	408		0
Prior	2,242		2,165
Revolving Loans Amortized Cost Basis	66		67
Revolving Loans Converted to Term	0		0
Total loans	4,436		3,814
Real Estate Loans [Member] | Residential Real Estate [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
Total loans	357,779		359,990
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]
Gross charge-offs	0	$ 0
Real Estate Loans [Member] | Home Equity [Member]
Financing Receivable, Credit Exposures by Internally Assigned Grades, by Origination Year [Abstract]
Total loans	$ 49,190		$ 49,791