Mortgage Banking - Changes in the Reserve for Mortgage Loan Servicing Putback Expense (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Schedule of changes in the reserve for mortgage loan [Abstract]
Balance at beginning of period	$ 1,685	$ 1,170
Provision for putback expenses	315	210
(Losses) gains	(944)	211
Balance at end of period	$ 1,056	$ 1,591