Income Taxes - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Other assets	$ 55,399,000	$ 40,666,000
Tax credits related to low income housing partnerships	1,298,000	955,000	896,000
Alaska film tax credits	59,000		398,000
U.S. Federal Statutory Tax Rate	35.00%	35.00%	35.00%
Retained earnings restricted to loss absorption	1,800,000
Unrecognized Tax Benefits	0
Income Tax Examination, Penalties and Interest Expense	0	0	0
Federal and State Authority
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 1,400,000