Mortgage Banking Activities, Loans Sold With Recourse (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Residential mortgage loans sold with recourse [Abstract]
Carrying amount of residential mortgage loans sold and subject to recourse	$ 139,000	$ 155,000
Activity in the allowance for losses on loans sold with recourse [Abstract]
Beginning balance	4,649	7,299	$ 9,562
Provision for recourse losses	725	(982)	354
Loans charged off, net	(1,358)	(1,668)	(2,617)
Ending balance	$ 4,016	$ 4,649	7,299
Residential Mortgage Loans Subject to Repurchase Under Standard Representations and Warranties [Abstract]
Number of mortgages purchased under repurchase agreement with US government sponsored entities	18
Purchase price of loans purchased under repurchase agreement with government sponsored entities	$ 3,900
Number of loans sold under standard representation and warranties indemnified	7
Number of loans with unresolved deficiency requests	233	198
Principal balance of loans with unresolved deficiency requests	$ 17,382	$ 15,624
Unpaid principal balance of mortgage loans subject to indemnification under standard representations and warranties	5,803	4,365
Activity in Accruals for Mortgage Losses [Roll Forward]
Beginning balance	3,359	3,220
Provision for losses	27	353
Charge-offs, net	(598)	(214)
Ending balance	$ 2,788	$ 3,359	$ 3,220