Loans and Credit Quality - Narrative (Details)		12 Months Ended
	Apr. 01, 2014 USD ($) purchased_loan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans secured by real estate		76.00%
Loans unsecured		3.00%
Loans secured for general commercial uses		21.00%
Net nonaccrual loans		$ 2,125,000	$ 3,496,000
Interest income earned on nonaccrual loans		276,000	218,000	$ 188,000
Interest income earned on nonaccrual loans with no balance		484,000	350,000	250,000
Greater than 90 days still accruing		0	0
Recorded investment in loans considered to be impaired		34,640,000	11,297,000
Impaired loan, average recorded investment		25,997,000	10,533,000	10,900,000
Impaired loan, interest income on accrual method		1,140,000	762,000	461,000
Fair value of purchased credit impaired loans	$ 3,900,000	1,600,000	3,000,000
Loans classified as troubled debt restructuring		13,740,000	7,700,000
Commitment to Lend		0
Write down on TDR		304,000	0
TDR with specific impairment		0	0
TDR that subsequently defaulted, recorded investment		0	0	$ 0
Loans pledged as collateral		0	0
Unfunded loan commitments		$ 0	$ 0
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recovery time for market		18 years
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recovery time for market		24 years
Alaska Pacific Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of purchased credit impaired loans	$ 3,899,000
Purchased impaired loans | purchased_loan	18
Accretable difference on purchased loans	$ 0