Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Taxes receivable	$ 878,000	$ 1,220,000
Operating Loss Carryforwards [Line Items]
Other assets	51,774,000	57,762,000
Tax credits related to low income housing partnerships	$ 2,446,000	1,298,000	$ 955,000
Alaska film tax credits		$ 59,000
U.S. tax rate	35.00%	35.00%	35.00%
Retained earnings restricted to loss absorption	$ 1,800,000
Unrecognized tax benefits	0
Penalties and interest expense	0	$ 0	$ 0
Federal and State Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 178,000	$ 1,400,000