Fair Value (Additional Information) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, allowance allocation recorded	$ 12,989,000	$ 12,674,000	$ 11,960,000	$ 11,566,000
Chargeoffs to impaired loans	174,000	28,000
Valuation allowance related to mortgage servicing rights	17,000	0
Write downs recorded in other real estate owned	0	0
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, allowance allocation recorded	317,000	161,000
Chargeoffs to impaired loans	$ 108,000	$ 298,000
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional adjustment	0.05%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional adjustment	0.75%