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Loans Receivable and Allowance for Credit Losses (Summary of Loan Concentrations by Industry) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 1,815,138,000	$ 1,714,082,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	737,533,000	716,875,000
Commercial Real Estate Loans [Member] | Loans Receivable [Member] | Commercial Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 169,560,000
Percent of Loans Outstanding	9.38%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 339,997,000	330,856,000
Residential Real Estate Loans [Member] | Loans Receivable [Member] | Residential Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 116,554,000
Percent of Loans Outstanding	6.45%
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 346,897,000	307,775,000
Consumer Loans [Member] | Loans Receivable [Member] | Hotels/Motels [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 121,907,000
Percent of Loans Outstanding	6.74%
Consumer Loans [Member] | Loans Receivable [Member] | Dairy Cattle/Milk Product [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 43,253,000
Percent of Loans Outstanding	2.39%
Consumer Loans [Member] | Loans Receivable [Member] | Fuel/Gas Stations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 48,924,000
Percent of Loans Outstanding	2.71%
Consumer Loans [Member] | Loans Receivable [Member] | Government Support [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 30,283,000
Percent of Loans Outstanding	1.68%
Consumer Loans [Member] | Loans Receivable [Member] | Mobile Home Park [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 21,723,000
Percent of Loans Outstanding	1.20%
Consumer Loans [Member] | Loans Receivable [Member] | Wineries [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 20,542,000
Percent of Loans Outstanding	1.14%
Consumer Loans [Member] | Loans Receivable [Member] | Camps [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 23,336,000
Percent of Loans Outstanding	1.29%
Consumer Loans [Member] | Loans Receivable [Member] | Resorts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 38,294,000
Percent of Loans Outstanding	2.12%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 80,311,000	$ 53,020,000
Construction Real Estate Loans [Member] | Loans Receivable [Member] | Builders/Contractors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 36,702,000
Percent of Loans Outstanding	2.03%

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