Loans and Allowance for Loan Losses (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 528,625	$ 514,682
Percentage of loans receivable	100.00%	100.00%
Financing Receivable Credit Quality Review Threshold	500
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	121,307	110,395
Percentage of loans receivable	23.00%	21.40%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	186,844	167,586
Percentage of loans receivable	35.40%	32.60%
Commercial real estate | Northern Idaho / Eastern Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable	66.10%
Commercial real estate | Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable	23.20%
Commercial real estate | Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable	14.60%
Commercial real estate | Health care
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable	12.00%
Commercial real estate | Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable	10.10%
Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable	40.10%
Commercial real estate | Finished condominiums
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable	1.50%
Construction and Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	35,100
Percentage of loans receivable	6.60%
Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	85,967	81,316
Percentage of loans receivable	16.30%	15.80%
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	16,544	26,038
Percentage of loans receivable	3.10%	5.10%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	70,600
Percentage of loans receivable	13.30%
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 12,267	$ 11,063
Percentage of loans receivable	2.30%	2.20%