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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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