Low-Income Housing Tax Credits (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) Fund	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Fund
Investments in Affordable Housing Projects [Abstract]
Affordable Housing Program, Number of Investments | Fund	4			4
Amortization Method Qualified Affordable Housing Project Investments	$ 4,112			$ 4,185
Qualified Affordable Housing Project Investments, Commitment	2,961			$ 2,961
Affordable Housing Investment Commitments, Term Expiration Year			2032
Expected Affordable Housing Tax Credits, Amount			$ 405
Affordable Housing Tax Credits and Other Tax Benefits, Amount	$ 126	$ 118