Mortgage Banking - Changes in the Reserve for Mortgage Loan Servicing Putback Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of changes in the reserve for mortgage loan [Abstract]
Balance at beginning of period	$ 1,685	$ 1,170
Provision for putback expenses	105	0
Gains (losses)	(5)	0
Balance at end of period	$ 1,785	$ 1,170