Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	$ 6,323,901
Unfunded Commitments	2,408,618
Total exposure	8,732,519	$ 8,236,327
Loans	22,424,501	19,787,876
Loans and Leases Receivable, Allowance	(285,050)	(94,777)
Loans and Leases Receivable, Net Amount	22,139,451	19,693,099
Commercial Real Estate Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,802,227	2,669,766
Commercial real estate non owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,203,384	5,039,452
Construction and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,901,746	2,430,483
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,038,457	6,290,296
Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	379,515	289,254
Lessors of Nonresidential Buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	3,558,320
Unfunded Commitments	884,392
Total exposure	4,442,712	4,578,116
Lessors of Residential Buildings and Dwellings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	1,340,937
Unfunded Commitments	785,309
Total exposure	2,126,246	1,599,837
New housing for-sale builders
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	474,932
Unfunded Commitments	649,370
Total exposure	1,124,302	1,090,603
Hotels and motels
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	949,712
Unfunded Commitments	89,547
Total exposure	$ 1,039,259	$ 967,771

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Represents the amount of financing receivables principal balance outstanding.

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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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