Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - Residential Mortgage [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Amortized Cost:
Balance at beginning of period	$ 39,874	$ 41,598	$ 40,944	$ 42,148
Originations of mortgage servicing rights	1,499	1,463	3,927	4,976
Amortization	(2,064)	(1,829)	(5,562)	(5,892)
Balance at end of period	39,309	41,232	39,309	41,232
Valuation allowance:
Balance at beginning of period	(1,721)	0	0	0
Additions	(1,280)	0	(3,001)	0
Balance at end of period	(3,001)	0	(3,001)	0
Net MSRs at end of period	$ 36,308	$ 41,232	$ 36,308	$ 41,232