Business Combinations - Summary of Fair Value Adjustments (Details) - USD ($) $ in Thousands	Dec. 01, 2014	Apr. 01, 2014	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill			$ (22,334)	$ (22,334)
Alaska Pacific Bank
Business Acquisition [Line Items]
Cost basis net assets		$ 14,733
Cash payment made		(6,423)
Common stock issued		(7,446)
Net loans		(1,137)
Premises and equipment		547
Other intangible assets		623
Mortgage servicing rights		(119)
Deposits		(844)
Other		236
Bargain purchase gain		$ 170
Residential Mortgage Holding Company
Business Acquisition [Line Items]
Cost basis net assets	$ 11,915
Cash payment made	(18,240)
Net loans	(360)
Other intangible assets	950
Other	(311)
Cash surrender value of life insurance paid	(3,896)
Liability for future earn out payments	(7,318)		$ (10,300)
Rate lock derivative asset	960
Investment in Homestate Mortgage, LLC	1,490
Goodwill	$ (14,810)