Loan Servicing Rights (Activity for Capitalized LSRs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Activity for Capitalized LSRs
Balance at beginning of period	$ 26,982
Amortization	(10,046)	$ (8,444)	$ (3,345)
Balance at end of period	40,211	26,982
Loan Servicing Rights
Activity for Capitalized LSRs
Balance at beginning of period	11,122	12,217	3,423
Acquired through acquisitions	0	1,284	9,235
Additions	3,303	1,476	1,075
Amortization	(4,187)	(4,055)	(1,316)
Change in valuation allowance	(8)	200	(200)
Balance at end of period	$ 10,230	$ 11,122	$ 12,217