Goodwill and Other Intangible Assets - Schedule of Mortgage Servicing Rights at Carrying Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 137,774	$ 137,774
Accumulated Amortization	(78,721)	(64,608)
Net Carrying Amount	59,053	73,166
Mortgage servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,517	13,612
Valuation Allowance	(195)		$ 0
Accumulated Amortization	(5,994)	(4,806)
Net Carrying Amount	$ 13,328	$ 8,806