Income Taxes - Narrative (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) state	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Income Tax Examination [Line Items]
Tax credits and other tax benefits from low-income housing tax credit	$ 1,100,000	$ 1,100,000	$ 1,100,000
Amount recognized as a component of income tax expense related low-income housing tax credit	300,000	200,000	200,000
Investments related to low-income housing tax credits	2,300,000		3,200,000
Impairment losses recognized from forfeiture or ineligibility	0	0	0
Future capital commitments related to low-income housing tax credit investments	$ 300,000
Number of states the company files income tax returns in | state	9
Unrecognized tax benefits	$ 1,359,000	1,884,000	1,257,000	$ 1,148,000
Unrecognized tax benefits that would impact effective tax rate	900,000	1,300,000	$ 800,000
Reduction in unrecognized tax benefit that is reasonably possible due to a lapse of statute of limitations	$ 500,000
Duration of unrecognized tax benefits	12 months
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
State valuation allowance		$ 0