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Loans Receivable and Allowance for Credit Losses (Loan Concentrations by Industry) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 1,771,682,000	$ 1,714,082,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	731,156,000	716,875,000
Commercial Real Estate Loans [Member] | Loans Receivable [Member] | Commercial Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 162,498,000
Percent of Loans Outstanding	9.21%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 330,288,000	330,856,000
Residential Real Estate Loans [Member] | Loans Receivable [Member] | Residential Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 117,528,000
Percent of Loans Outstanding	6.66%
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 327,683,000	307,775,000
Consumer Loans [Member] | Loans Receivable [Member] | Hotels/Motels [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 107,206,000
Percent of Loans Outstanding	6.08%
Consumer Loans [Member] | Loans Receivable [Member] | Dairy Cattle/Milk Product [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 43,993,000
Percent of Loans Outstanding	2.49%
Consumer Loans [Member] | Loans Receivable [Member] | Fuel/Gas Stations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 49,366,000
Percent of Loans Outstanding	2.80%
Consumer Loans [Member] | Loans Receivable [Member] | Government Support [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 25,898,000
Percent of Loans Outstanding	1.47%
Consumer Loans [Member] | Loans Receivable [Member] | Mobile Home Park [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 22,296,000
Percent of Loans Outstanding	1.26%
Consumer Loans [Member] | Loans Receivable [Member] | Wineries [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 23,313,000
Percent of Loans Outstanding	1.32%
Consumer Loans [Member] | Loans Receivable [Member] | Camps [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 23,943,000
Percent of Loans Outstanding	1.36%
Consumer Loans [Member] | Loans Receivable [Member] | Resorts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 34,512,000
Percent of Loans Outstanding	1.96%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 58,226,000	$ 53,020,000
Construction Real Estate Loans [Member] | Loans Receivable [Member] | Builders/Contractors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 38,627,000
Percent of Loans Outstanding	2.19%

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