Goodwill and Intangible Assets Mortgage Servicing Rights (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ (2,153,000)	$ (1,909,000)	$ (891,000)
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 1,069,000	0	1,069,000
Capitalization Of Mortgage Servicing Rights		0	14,000
Amortization of intangible assets		(141,000)	(98,000)	$ 0
Finite-Lived Intangible Assets, Net	$ 985,000	$ 844,000	$ 985,000