Fair Value Measurements - Quantitative Information (Details) - Level 3	Jun. 30, 2020	Dec. 31, 2019
Recurring | Mortgage Servicing Rights | Discounted Cash Flow | Minimum | Prepayment speed assumption
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Mortgage servicing rights, unobservable input(s)	1.52	1.32
Recurring | Mortgage Servicing Rights | Discounted Cash Flow | Minimum | Discount rate
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Mortgage servicing rights, unobservable input(s)	0.10	0.125
Recurring | Mortgage Servicing Rights | Discounted Cash Flow | Maximum | Prepayment speed assumption
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Mortgage servicing rights, unobservable input(s)	2.38	4.85
Recurring | Mortgage Servicing Rights | Discounted Cash Flow | Maximum | Discount rate
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Mortgage servicing rights, unobservable input(s)	0.12	0.135
Recurring | Mortgage Servicing Rights | Discounted Cash Flow | Weighted Average | Prepayment speed assumption
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Mortgage servicing rights, unobservable input(s)	2.16	1.87
Recurring | Mortgage Servicing Rights | Discounted Cash Flow | Weighted Average | Discount rate
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Mortgage servicing rights, unobservable input(s)	0.101	0.125
Nonrecurring | OREO | Market Approach | Minimum | Adjustment for differences between comparable sales
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
OREO, unobservable input(s)	0	0
Nonrecurring | OREO | Market Approach | Maximum | Adjustment for differences between comparable sales
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
OREO, unobservable input(s)	0	0
Nonrecurring | OREO | Market Approach | Weighted Average | Adjustment for differences between comparable sales
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
OREO, unobservable input(s)	0	0
Nonrecurring | Impaired loans | Market Approach | Minimum | Adjustment for differences between comparable sales
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Impaired loans, unobservable input(s)	0	0
Nonrecurring | Impaired loans | Market Approach | Maximum | Adjustment for differences between comparable sales
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Impaired loans, unobservable input(s)	1	1
Nonrecurring | Impaired loans | Market Approach | Weighted Average | Adjustment for differences between comparable sales
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Impaired loans, unobservable input(s)	0.08	0.06