Fair Value Measurements - Quantitative Information (Details) - Level 3	Mar. 31, 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)	1.51	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)	2.48	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)	2.09	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 | Adjusted for difference 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 | Adjusted for difference 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 | Adjusted for difference 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 | Adjusted for difference 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 | Adjusted for difference 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 | Adjusted for difference between comparable sales
Valuation Technique, Unobservable Input, and Qualitative Information about Unobservable Inputs [Abstract]
Impaired loans, unobservable input(s)	0.08	0.06