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Loans - Nonaccrual loans (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Loans
Total loans on nonaccrual status		$ 95,188,000	$ 33,141,000
Greater than 90 Days Accruing		11,651,000
Non-accrual with no allowance		11,253,000
Addition of loans formerly accounted for as credit impaired loans		21,000,000.0
Loans		$ 24,206,825,000	11,313,113,000
Number of months generally required to return to accruing status		6 months
Decrease in overall collateral dependent loans			(14,900,000)
Loans individually evaluated for impairment	$ 1,000,000.0			$ 500,000
CSFL
Loans
Increase in overall collateral dependent loans	$ 17,600,000
Acquired credit impaired loans | CSFL
Loans
Loans		$ 69,300,000
Commercial loans | Construction and land development
Loans
Total loans on nonaccrual status		2,421,000	1,193,000
Non-accrual with no allowance		533,000
Commercial loans | Commercial non-owner occupied
Loans
Total loans on nonaccrual status		4,596,000	1,154,000
Greater than 90 Days Accruing		471,000
Commercial loans | Commercial non-owner occupied real estate
Loans
Total loans on nonaccrual status		26,059,000	4,385,000
Non-accrual with no allowance		9,351,000
Commercial loans | Commercial and industrial
Loans
Total loans on nonaccrual status		9,218,000	6,913,000
Greater than 90 Days Accruing		10,864,000
Non-accrual with no allowance		585,000
Commercial loans | Other income producing property
Loans
Total loans on nonaccrual status		6,130,000	1,947,000
Greater than 90 Days Accruing		278,000
Non-accrual with no allowance		349,000
Consumer | Consumer Owner Occupied Loans
Loans
Total loans on nonaccrual status		30,746,000	9,718,000
Greater than 90 Days Accruing		34,000
Non-accrual with no allowance		383,000
Consumer | Home equity loans
Loans
Total loans on nonaccrual status		9,944,000	4,640,000
Non-accrual with no allowance		52,000
Consumer | Consumer
Loans
Total loans on nonaccrual status		6,074,000	$ 3,191,000
Greater than 90 Days Accruing		$ 4,000

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