Mortgage Banking - Changes in the Reserve for Mortgage Loan Servicing Putback Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of changes in the reserve for mortgage loan [Abstract]
Balance at beginning of period	$ 1,170	$ 1,050	$ 7,800
Provision for putback expenses	315	600	1,561
Gains (Losses)	200	(480)	(4,756)
FNMA resolution	0	0	(3,555)
Balance at end of period	$ 1,685	$ 1,170	$ 1,050