Fair Value Measurements - (Details 3) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	$ 3,389	$ 4,101
OREO	6,167	6,741
Mortgage servicing rights		26,302
Total	9,556	37,144
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
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
Level 3
Impaired loans measured at fair value on a nonrecurring basis
Impaired loans	3,389	4,101
OREO	6,167	6,741
Mortgage servicing rights		26,302
Total	$ 9,556	$ 37,144