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Troubled Debt Restructurings (Details Textual)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) Loans Customer	Mar. 31, 2020 USD ($) Loans	Dec. 31, 2020 USD ($)
Financing Receivable Modifications [Line Items]
Total troubled debt restructurings	$ 3,900,000		$ 4,100,000
Specific reserves to loans			436,000
Commitments to lend additional amounts to borrowers classified as troubled debt restructurings	0		0
Provision for credit losses	425,000	$ 1,100,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Financing Receivable Modifications [Line Items]
Total troubled debt restructurings	$ 199,800,000
Number of business customers facilitated assistance | Customer	1,714
Small Business Administration (SBA), CARES Act, Paycheck Protection Program | First Round of PPP Loan
Financing Receivable Modifications [Line Items]
Payments received from forgiveness of loans	$ 137,200,000
Percentage of payments received from forgiveness of loans	68.70%
Small Business Administration (SBA), CARES Act, Paycheck Protection Program | Second Round of PPP Loan
Financing Receivable Modifications [Line Items]
Payments received from forgiveness of loans	$ 75,100,000
Payment Deferral
Financing Receivable Modifications [Line Items]
Number of months offered, deferrals	3 months
Residential real estate loan
Financing Receivable Modifications [Line Items]
Provision for loan losses			0
Loans default payment past due period	30 days
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans	1
Commercial loans
Financing Receivable Modifications [Line Items]
Provision for loan losses	$ 0
Loans default payment past due period	30 days
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans	1	1
Commercial farmland loans
Financing Receivable Modifications [Line Items]
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans	2	2
Minimum | Payment Deferral
Financing Receivable Modifications [Line Items]
Number of months offered, deferrals	3 months
Maximum | Payment Deferral
Financing Receivable Modifications [Line Items]
Number of months offered, deferrals	9 months
Troubled debt restructurings
Financing Receivable Modifications [Line Items]
Specific reserves to loans	$ 94,000		$ 81,000
Allowance adjustment charge offs	20,000	$ 5,000
Provision for credit losses	$ 20,000	$ 5,000
Contractual Interest Rate Reduction
Financing Receivable Modifications [Line Items]
Reduction of the notes stated interest rate	4.075%
Extended Maturity
Financing Receivable Modifications [Line Items]
Maturity period loans	22 days
Extended Maturity | Minimum
Financing Receivable Modifications [Line Items]
Maturity period loans		168 months
Extended Maturity | Maximum
Financing Receivable Modifications [Line Items]
Maturity period loans		180 months

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