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Loans Receivable and Allowance for Credit Losses (Loan Concentrations by Industry) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 1,641,531,000	$ 1,603,877,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	685,212,000	675,156,000
Commercial Real Estate Loans [Member] | Loans Receivable [Member] | Commercial Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 146,099,000
Percent of Loans Outstanding	8.90%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 317,507,000	316,546,000
Residential Real Estate Loans [Member] | Loans Receivable [Member] | Residential Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 112,764,000
Percent of Loans Outstanding	6.87%
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 289,880,000	264,321,000
Consumer Loans [Member] | Loans Receivable [Member] | Hotels/Motels [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 97,296,000
Percent of Loans Outstanding	5.93%
Consumer Loans [Member] | Loans Receivable [Member] | Dairy Cattle/Milk Product [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 45,835,000
Percent of Loans Outstanding	2.79%
Consumer Loans [Member] | Loans Receivable [Member] | Fuel/Gas Stations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 50,325,000
Percent of Loans Outstanding	3.07%
Consumer Loans [Member] | Loans Receivable [Member] | Government Support [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 25,232,000
Percent of Loans Outstanding	1.54%
Consumer Loans [Member] | Loans Receivable [Member] | Mobile Home Park [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 27,275,000
Percent of Loans Outstanding	1.66%
Consumer Loans [Member] | Loans Receivable [Member] | Wineries [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 23,961,000
Percent of Loans Outstanding	1.46%
Consumer Loans [Member] | Loans Receivable [Member] | Camps [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 24,625,000
Percent of Loans Outstanding	1.50%
Consumer Loans [Member] | Loans Receivable [Member] | Resorts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 19,892,000
Percent of Loans Outstanding	1.21%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 48,030,000	$ 51,453,000
Construction Real Estate Loans [Member] | Loans Receivable [Member] | Builders/Contractors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 35,755,000
Percent of Loans Outstanding	2.18%

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