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Loans Receivable and Allowance for Credit Losses (Loan Concentrations by Industry) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 1,621,680,000	$ 1,603,877,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	691,755,000	675,156,000
Commercial Real Estate Loans [Member] | Loans Receivable [Member] | Commercial Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 148,899,000
Percent of Loans Outstanding	9.18%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 313,531,000	316,546,000
Residential Real Estate Loans [Member] | Loans Receivable [Member] | Residential Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 113,474,000
Percent of Loans Outstanding	7.00%
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 271,231,000	264,321,000
Consumer Loans [Member] | Loans Receivable [Member] | Hotels/Motels [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 92,138,000
Percent of Loans Outstanding	5.68%
Consumer Loans [Member] | Loans Receivable [Member] | Dairy Cattle/Milk Product [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 47,430,000
Percent of Loans Outstanding	2.93%
Consumer Loans [Member] | Loans Receivable [Member] | Fuel/Gas Stations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 46,552,000
Percent of Loans Outstanding	2.87%
Consumer Loans [Member] | Loans Receivable [Member] | Government Support [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 26,914,000
Percent of Loans Outstanding	1.66%
Consumer Loans [Member] | Loans Receivable [Member] | Mobile Home Park [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 27,861,000
Percent of Loans Outstanding	1.72%
Consumer Loans [Member] | Loans Receivable [Member] | Wineries [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 23,863,000
Percent of Loans Outstanding	1.47%
Consumer Loans [Member] | Loans Receivable [Member] | Camps [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 25,647,000
Percent of Loans Outstanding	1.58%
Consumer Loans [Member] | Loans Receivable [Member] | Resorts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 20,154,000
Percent of Loans Outstanding	1.24%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 47,409,000	$ 51,453,000
Construction Real Estate Loans [Member] | Loans Receivable [Member] | Builders/Contractors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 39,878,000
Percent of Loans Outstanding	2.46%

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