Loans and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 20,396,853	$ 19,787,876
Loan losses, allowance	222,465	94,777
Loans and Leases Receivable, Net Amount	20,174,388	19,693,099
Commercial real estate- owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,650,170	2,669,766
Commercial real estate- Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,070,572	5,039,452
Consumer real estate – mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,106,465	3,068,625
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,520,937	2,430,483
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,752,317	6,290,296
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 296,392	$ 289,254

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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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