Fair Value Measurements (Details 3) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	$ 4,101	$ 6,508
OREO	6,741	12,839
Mortgage servicing rights	26,302
Total	37,144	19,347
Quoted Prices In Active Markets for Identical Assets (Level 1)
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	0	0
OREO	0	0
Mortgage servicing rights	0
Total	0	0
Significant Other Observable Inputs (Level 2)
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	0	0
OREO	0	0
Mortgage servicing rights	0
Total	0	0
Significant Unobservable Inputs (Level 3)
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	4,101	6,508
OREO	6,741	12,839
Mortgage servicing rights	26,302
Total	$ 37,144	$ 19,347