Goodwill and Intangible Assets Mortgage Servicing Rights (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ (3,215,000)	$ (2,153,000)	$ (1,909,000)
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 1,558,000	1,558,000	0
Capitalization Of Mortgage Servicing Rights		7,000	0
Amortization of intangible assets		(308,000)	(141,000)	(98,000)
Finite-Lived Intangible Assets, Net	$ 844,000	$ 2,101,000	$ 844,000	$ 985,000