Mortgage Banking - Changes in the Reserve for Mortgage Loan Servicing Putback Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of changes in the reserve for mortgage loan [Abstract]
Balance at beginning of period	$ 1,685	$ 1,170	$ 1,050
Provision for putback expenses	420	315	600
(Losses) Gains	(975)	200	(480)
Balance at end of period	$ 1,130	$ 1,685	$ 1,170