Fair Value Measurements (Details 6) - Non-recurring $ in Thousands	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Level 3
Valuation Methodology
Assets measured at fair value	$ 32,185	$ 21,837
Carrying Value | Level 3 | Collateral based measurements | Impaired loans
Valuation Methodology
Assets measured at fair value	22,002	8,492
Carrying Value | Level 3 | Discounted cash flows | Mortgage servicing rights
Valuation Methodology
Assets measured at fair value	3,748	4,200
Carrying Value | Level 3 | Appraisals trade publications and auction values | Repossessions
Valuation Methodology
Assets measured at fair value	6,132	8,623
Carrying Value | Level 3 | Appraisals | Other real estate
Valuation Methodology
Assets measured at fair value	303	522
Fair Value
Valuation Methodology
Assets measured at fair value	32,185	21,837
Fair Value | Level 3 | Collateral based measurements | Impaired loans
Valuation Methodology
Assets measured at fair value	22,002	8,492
Fair Value | Level 3 | Discounted cash flows | Mortgage servicing rights
Valuation Methodology
Assets measured at fair value	4,023	5,986
Fair Value | Level 3 | Appraisals trade publications and auction values | Repossessions
Valuation Methodology
Assets measured at fair value	6,474	9,211
Fair Value | Level 3 | Appraisals | Other real estate
Valuation Methodology
Assets measured at fair value	$ 324	$ 564
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)	0.10	0
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)	0.50	0.90
Discount for lack of marketability and current conditions | Level 3 | Collateral based measurements | Impaired loans | Weighted Average
Unobservable Inputs
Impaired loans unobservable inputs (as a percent)	0.18
Constant prepayment rate (CPR) | Level 3 | Discounted cash flows | Mortgage servicing rights | Minimum
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.144	0.102
Constant prepayment rate (CPR) | Level 3 | Discounted cash flows | Mortgage servicing rights | Maximum
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.251	0.281
Constant prepayment rate (CPR) | Level 3 | Discounted cash flows | Mortgage servicing rights | Weighted Average
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.199
Discount rate | Level 3 | Discounted cash flows | Mortgage servicing rights | Minimum
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.086	0.093
Discount rate | Level 3 | Discounted cash flows | Mortgage servicing rights | Maximum
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.115	0.121
Discount rate | Level 3 | Discounted cash flows | Mortgage servicing rights | Weighted Average
Unobservable Inputs
Mortgage servicing rights unobservable inputs (as a percent)	0.089
Discount for lack of marketability | Level 3 | Appraisals trade publications and auction values | Repossessions | Minimum
Unobservable Inputs
Repossessions unobservable inputs (as a percent)	0.03	0.03
Discount for lack of marketability | Level 3 | Appraisals trade publications and auction values | Repossessions | Maximum
Unobservable Inputs
Repossessions unobservable inputs (as a percent)	0.19	0.25
Discount for lack of marketability | Level 3 | Appraisals trade publications and auction values | Repossessions | Weighted Average
Unobservable Inputs
Repossessions unobservable inputs (as a percent)	0.05
Discount for lack of marketability | Level 3 | Appraisals | Other real estate | Minimum
Unobservable Inputs
Other real estate unobservable inputs (as a percent)	0	0
Discount for lack of marketability | Level 3 | Appraisals | Other real estate | Maximum
Unobservable Inputs
Other real estate unobservable inputs (as a percent)	0.06	0.11
Discount for lack of marketability | Level 3 | Appraisals | Other real estate | Weighted Average
Unobservable Inputs
Other real estate unobservable inputs (as a percent)	0.06