Goodwill and Other Intangible Assets - Activity In Valuation Allowance For Mortgage Servicing Rights (Details) - Mortgage Servicing Rights [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance, beginning of period	$ 0	$ 0	$ 0	$ 0
Additions	(21)	0	(21)	0
Valuation allowance, end of period	$ (21)	$ 0	$ (21)	$ 0