Loan Servicing Rights (Activity for Capitalized LSRs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Activity for Capitalized LSRs
Balance at beginning of period	$ 34,271
Amortization	(5,716)	$ (6,090)	$ (10,046)
Balance at end of period	$ 28,556	34,271
Loan Servicing Rights
Activity for Capitalized LSRs
Balance at beginning of period		$ 10,230	11,122
Additions			3,303
Amortization			(4,187)
Change in valuation allowance			(8)
Balance at end of period			$ 10,230