Low Income Housing Tax Credit Partnerships (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Affordable Housing Tax Credit Investments and Related Unfunded Commitments [Abstract]
Net affordable housing tax credit investments	$ 66,600,000		$ 68,500,000
Affordable Housing Tax Credit Investments, Unfunded Commitment [Abstract]
2015	12,426,000
2016	13,865,000
2017	471,000
2018	15,000
2019	75,000
Thereafter	68,000
Total Unfunded Commitments	26,920,000
Affordable Housing Tax Credits and Other Tax Benefits, Recognized [Abstract]
Effective yield method, tax credits and other tax benefits recognized	3,389,000	2,711,000
Effective yield method, amortization expense in provision for income taxes	$ 1,893,000	$ 1,402,000