Loans Receivable and Allowance for Credit Losses (Summary of Loan Concentrations by Industry) (Details) - USD ($)	6 Months Ended
Jun. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 1,791,044,000	$ 1,714,082,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	736,969,000	716,875,000
Commercial Real Estate Loans [Member] \| Loans Receivable [Member] \| Commercial Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 162,674,000
Percent of Loans Outstanding	9.12%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 332,631,000	330,856,000
Residential Real Estate Loans [Member] \| Loans Receivable [Member] \| Residential Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 117,244,000
Percent of Loans Outstanding	6.57%
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 335,040,000	307,775,000
Consumer Loans [Member] \| Loans Receivable [Member] \| Hotels/Motels [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 118,552,000
Percent of Loans Outstanding	6.65%
Consumer Loans [Member] \| Loans Receivable [Member] \| Dairy Cattle/Milk Product [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 43,369,000
Percent of Loans Outstanding	2.43%
Consumer Loans [Member] \| Loans Receivable [Member] \| Fuel/Gas Stations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 48,528,000
Percent of Loans Outstanding	2.72%
Consumer Loans [Member] \| Loans Receivable [Member] \| Government Support [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 22,656,000
Percent of Loans Outstanding	1.27%
Consumer Loans [Member] \| Loans Receivable [Member] \| Mobile Home Park [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 20,221,000
Percent of Loans Outstanding	1.13%
Consumer Loans [Member] \| Loans Receivable [Member] \| Wineries [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 22,448,000
Percent of Loans Outstanding	1.26%
Consumer Loans [Member] \| Loans Receivable [Member] \| Camps [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 23,635,000
Percent of Loans Outstanding	1.33%
Consumer Loans [Member] \| Loans Receivable [Member] \| Resorts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 35,589,000
Percent of Loans Outstanding	2.00%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 68,013,000	$ 53,020,000
Construction Real Estate Loans [Member] \| Loans Receivable [Member] \| Builders/Contractors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Loans	$ 37,375,000
Percent of Loans Outstanding	2.10%

Accounts, Notes, Loans and Financing Receivable [Line Items]