Fair Value Measurements (Details 6) - Non-recurring $ in Thousands	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Level 3
Valuation Methodology
Assets measured at fair value	$ 23,464	$ 18,554
Carrying Value | Level 3 | Collateral based measurements | Impaired loans
Valuation Methodology
Assets measured at fair value	12,118	7,306
Carrying Value | Level 3 | Discounted cash flows | Mortgage servicing rights
Valuation Methodology
Assets measured at fair value	4,107	4,283
Carrying Value | Level 3 | Appraisals trade publications and auction values | Repossessions
Valuation Methodology
Assets measured at fair value	6,610	6,666
Carrying Value | Level 3 | Appraisals | Other real estate
Valuation Methodology
Assets measured at fair value	629	299
Fair Value
Valuation Methodology
Assets measured at fair value	23,464	18,554
Fair Value | Level 3 | Collateral based measurements | Impaired loans
Valuation Methodology
Assets measured at fair value	12,118	7,306
Fair Value | Level 3 | Discounted cash flows | Mortgage servicing rights
Valuation Methodology
Assets measured at fair value	5,722	7,238
Fair Value | Level 3 | Appraisals trade publications and auction values | Repossessions
Valuation Methodology
Assets measured at fair value	7,044	6,991
Fair Value | Level 3 | Appraisals | Other real estate
Valuation Methodology
Assets measured at fair value	$ 674	$ 305
Discount for lack of marketability and current conditions | Level 3 | Collateral based measurements | Impaired loans | Minimum
Unobservable Inputs
Impaired loans unobservable inputs (as a percent)	0.0000	0.2000
Discount for lack of marketability and current conditions | Level 3 | Collateral based measurements | Impaired loans | Maximum
Unobservable Inputs
Impaired loans unobservable inputs (as a percent)	1.0000	0.3500
Constant prepayment rate (CPR) | Level 3 | Discounted cash flows | Mortgage servicing rights | Minimum
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.1150	0.0720
Constant prepayment rate (CPR) | Level 3 | Discounted cash flows | Mortgage servicing rights | Maximum
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.2360	0.2480
Discount rate | Level 3 | Discounted cash flows | Mortgage servicing rights | Minimum
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.0910	0.1030
Discount rate | Level 3 | Discounted cash flows | Mortgage servicing rights | Maximum
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.1200	0.1310
Discount for lack of marketability | Level 3 | Appraisals trade publications and auction values | Repossessions | Minimum
Unobservable Inputs
Repossessions unobservable inputs (as a percent)	0.02	0.04
Discount for lack of marketability | Level 3 | Appraisals trade publications and auction values | Repossessions | Maximum
Unobservable Inputs
Repossessions unobservable inputs (as a percent)	0.18	0.06
Discount for lack of marketability | Level 3 | Appraisals | Other real estate | Minimum
Unobservable Inputs
Other real estate unobservable inputs (as a percent)	0.00	0.00
Discount for lack of marketability | Level 3 | Appraisals | Other real estate | Maximum
Unobservable Inputs
Other real estate unobservable inputs (as a percent)	0.09	0.10