Loans and Allowance for Loan Losses (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 73,836,000	$ 61,605,000
Financing Receivable, Nonaccrual, No Allowance	36,537,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	2,362,000	1,615,000
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	176,000	$ 469,000
Loans	22,424,501,000	19,787,876,000
Currently performing impaired loans	51,700,000	35,800,000
Financing Receivable, Modifications, Accruing As Of Restructured Date	$ 2,500,000	$ 4,900,000
Percentage of credit exposure to risk based capital	25.00%
Construction and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of credit exposure to risk based capital	89.00%	83.60%
Commercial real estate non owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of credit exposure to risk based capital	264.00%	268.30%
Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,800,000,000
Commercial Real Estate Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	10,231,000	$ 11,654,000
Financing Receivable, Nonaccrual, No Allowance	5,985,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Loans	2,802,227,000	2,669,766,000
Commercial real estate non owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	5,219,000	7,173,000
Financing Receivable, Nonaccrual, No Allowance	1,522,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Loans	5,203,384,000	5,039,452,000
Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	22,191,000	24,667,000
Financing Receivable, Nonaccrual, No Allowance	0
Financing Receivable, 90 Days or More Past Due, Still Accruing	273,000	168,000
Construction and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,953,000	2,278,000
Financing Receivable, Nonaccrual, No Allowance	0
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Loans	2,901,746,000	2,430,483,000
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	34,238,000	15,685,000
Financing Receivable, Nonaccrual, No Allowance	29,030,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	1,785,000	946,000
Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	4,000	148,000
Financing Receivable, Nonaccrual, No Allowance	0
Financing Receivable, 90 Days or More Past Due, Still Accruing	304,000	501,000
Loans	$ 379,515,000	$ 289,254,000

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Financing Receivable, Modifications, Accruing As Of Restructured Date

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Refers to percentage of credit exposure (loans outstanding plus unfunded lines of credit) to total risk based capital to borrowers in certain industries.

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Amount of financing receivable on nonaccrual status with no allowance for credit loss.

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

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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Amount before allowance and after 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.

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