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Loans - Nonaccrual loans (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020
Loans
Total loans on nonaccrual status	$ 85,118,000	$ 95,188,000
Greater than 90 Days Accruing	559,000
Non-accrual with no allowance	12,358,000
Loans	$ 23,682,677,000	24,206,825,000
Number of months generally required to return to accruing status	6 months
Increase in overall collateral dependent loans	$ 3,200,000
Loans individually evaluated for impairment			$ 1,000,000.0	$ 500,000
Other income producing property
Loans
Total loans on nonaccrual status	5,118,000	7,543,000
Non-accrual with no allowance	309,000
Commercial loans | Construction and land development
Loans
Total loans on nonaccrual status	2,063,000	2,421,000
Non-accrual with no allowance	89,000
Commercial loans | Commercial non-owner occupied
Loans
Total loans on nonaccrual status	11,877,000	5,470,000
Non-accrual with no allowance	17,000
Commercial loans | Commercial owner occupied real estate loan
Loans
Total loans on nonaccrual status	22,516,000	26,059,000
Greater than 90 Days Accruing	92,000
Non-accrual with no allowance	11,687,000
Commercial loans | Commercial and industrial
Loans
Total loans on nonaccrual status	6,039,000	9,218,000
Greater than 90 Days Accruing	467,000
Non-accrual with no allowance	206,000
Consumer | Consumer Owner Occupied Loans
Loans
Total loans on nonaccrual status	23,520,000	28,477,000
Consumer | Home equity loans
Loans
Total loans on nonaccrual status	9,574,000	9,926,000
Non-accrual with no allowance	50,000
Consumer | Consumer
Loans
Total loans on nonaccrual status	$ 4,411,000	$ 6,074,000

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Amount of unpaid principal balance of financing receivables for which there is no related allowance for credit losses.

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The balance of financing receivables that were individually evaluated for impairment.

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Amount of financing receivable 90 days or more past due and still accruing.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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