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Fair Value (Additional Information) (Details) - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, carrying amount	[1]			$ 7,229,000
Valuation allowance for impaired loans				3,371,000
Other real estate carried at fair value less cost to sell		$ 0		0
Other real estate, adjustments to carrying value less costs to charged to earnings		0		0
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		875,787,000		854,825,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		3,482,000		4,021,000
Loans Held-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains/(losses) from changes in fair value included in earnings		5,000	$ 134,000
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		326,864,000		324,300,000
Gains/(losses) included in earnings attributable to other changes in fair value		(16,000)	$ (9,000)
Obligations of State and Political Subdivisions | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		3,482,000		4,021,000
Collateral-dependent loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, carrying amount		19,005,000		5,574,000
Valuation allowance for impaired loans		8,876,000		2,971,000
Collateral-dependent loans | Impaired Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Increase (decrease) in allowance for loan losses		$ 1,849,000		$ (1,149,000)
[1] Total recorded investment in loans includes $13,929 in accrued interest.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of increase (decrease) in allowance for credit loss on financing receivable.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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