Goodwill and Intangible Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2007	Apr. 01, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill recorded	$ 15,017,000	$ 22,334,000
Accumulated amortization for intangible assets	6,800,000	6,700,000
Trade name intangible	950,000	950,000
Goodwill impairment	0
Intangible asset amortization expense	135,000	258,000	$ 289,000
Alaska First
Finite-Lived Intangible Assets [Line Items]
Goodwill recorded				$ 1,800,000
CDI recorded				$ 1,300,000
Alaska Pacific Bank
Finite-Lived Intangible Assets [Line Items]
CDI recorded					$ 623,000
RML
Finite-Lived Intangible Assets [Line Items]
Goodwill recorded	7,500,000
Trade name intangible	950,000
Core Deposits | Alaska First
Finite-Lived Intangible Assets [Line Items]
Estimated useful life, years				10 years
Accumulated amortization for intangible assets	1,300,000	1,300,000	1,200,000
Core Deposits | Alaska Pacific Bank
Finite-Lived Intangible Assets [Line Items]
Estimated useful life, years				10 years
Accumulated amortization for intangible assets	$ 283,000	$ 190,000	$ 85,000