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Loans and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 23,058,461	$ 22,424,501
Loan losses, allowance	268,635	285,050
Loans and Leases Receivable, Net Amount	22,789,826	22,139,451
Commercial real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,954,519	2,802,227
Commercial real estate - Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,219,207	5,203,384
Consumer real estate – mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,540,439	3,099,172
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,096,961	2,901,746
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	7,788,153	8,038,457
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 459,182	$ 379,515

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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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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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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