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Loans (Net (Charge-Offs)/Recoveries, Segregated by Class of Loans) (Detail) $ in Thousands | Dec. 31, 2020 USD ($) Grade | Dec. 31, 2019 USD ($) Grade
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 17,481,309 | $ 14,750,332
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.45 | 6.44
Loans, net of unearned discounts | $ 4,955,341 | $ 5,187,466
Commercial Portfolio Segment [Member] | Risk Grade One To Eight [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.13 | 6.17
Loans, net of unearned discounts | $ 4,506,121 | $ 4,788,857
Commercial Portfolio Segment [Member] | Risk Grade Nine [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 9.00
Loans, net of unearned discounts | 256,198 | $ 247,212
Commercial Portfolio Segment [Member] | Risk Grade Ten [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 10.00
Loans, net of unearned discounts | 125,977 | $ 71,472
Commercial Portfolio Segment [Member] | Risk Grade Eleven [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 11.00
Loans, net of unearned discounts | 47,196 | $ 53,887
Commercial Portfolio Segment [Member] | Risk Grade Twelve [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 12.00
Loans, net of unearned discounts | 14,528 | $ 18,189
Commercial Portfolio Segment [Member] | Risk Grade Thirteen [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 13.00
Loans, net of unearned discounts | $ 5,321 | $ 7,849
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.85 | 6.39
Loans, net of unearned discounts | $ 1,235,198 | $ 1,652,882
Commercial and Industrial Total Energy Loans [Member] | Risk Grade One To Eight [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 5.99 | 5.90
Loans, net of unearned discounts | $ 968,144 | $ 1,488,301
Commercial and Industrial Total Energy Loans [Member] | Risk Grade Nine [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 9.00
Loans, net of unearned discounts | 133,547 | $ 32,163
Commercial and Industrial Total Energy Loans [Member] | Risk Grade Ten [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 10.00
Loans, net of unearned discounts | 46,427 | $ 51,898
Commercial and Industrial Total Energy Loans [Member] | Risk Grade Eleven [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 11.00
Loans, net of unearned discounts | 63,912 | $ 14,760
Commercial and Industrial Total Energy Loans [Member] | Risk Grade Twelve [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 12.00
Loans, net of unearned discounts | 13,741 | $ 45,514
Commercial and Industrial Total Energy Loans [Member] | Risk Grade Thirteen [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 13.00
Loans, net of unearned discounts | $ 9,427 | $ 20,246
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.34 | 7.01
Loans, net of unearned discounts | $ 5,796,653 | $ 4,883,580
Commercial Real Estate, Buildings, Land and Other [Member] | Risk Grade One To Eight [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.97 | 6.78
Loans, net of unearned discounts | $ 5,047,873 | $ 4,523,271
Commercial Real Estate, Buildings, Land and Other [Member] | Risk Grade Nine [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 9.00
Loans, net of unearned discounts | 325,227 | $ 163,714
Commercial Real Estate, Buildings, Land and Other [Member] | Risk Grade Ten [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 10.00
Loans, net of unearned discounts | 258,454 | $ 103,626
Commercial Real Estate, Buildings, Land and Other [Member] | Risk Grade Eleven [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 11.00
Loans, net of unearned discounts | 149,362 | $ 84,057
Commercial Real Estate, Buildings, Land and Other [Member] | Risk Grade Twelve [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 12.00
Loans, net of unearned discounts | 15,224 | $ 8,529
Commercial Real Estate, Buildings, Land and Other [Member] | Risk Grade Thirteen [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 13.00
Loans, net of unearned discounts | $ 513 | $ 383
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.22 | 7.31
Loans, net of unearned discounts | $ 1,223,814 | $ 1,312,659
Construction Loans [Member] | Risk Grade One To Eight [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.99 | 7.25
Loans, net of unearned discounts | $ 1,110,025 | $ 1,274,098
Construction Loans [Member] | Risk Grade Nine [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 9.00
Loans, net of unearned discounts | 72,287 | $ 21,509
Construction Loans [Member] | Risk Grade Ten [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 10.00
Loans, net of unearned discounts | 38,962 | $ 15,243
Construction Loans [Member] | Risk Grade Eleven [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 11.00
Loans, net of unearned discounts | 856 | $ 1,144
Construction Loans [Member] | Risk Grade Twelve [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 12.00
Loans, net of unearned discounts | 1,684 | $ 665
Construction Loans [Member] | Risk Grade Thirteen [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 13.00
Loans, net of unearned discounts | $ 0 | $ 0
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.32 | 7.07
Loans, net of unearned discounts | $ 7,020,467 | $ 6,196,239
Commercial Real Estate Portfolio Segment [Member] | Risk Grade One To Eight [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 6.88
Loans, net of unearned discounts |  | $ 5,797,369
Commercial Real Estate Portfolio Segment [Member] | Risk Grade Nine [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 9.00
Loans, net of unearned discounts |  | $ 185,223
Commercial Real Estate Portfolio Segment [Member] | Risk Grade Ten [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 10.00
Loans, net of unearned discounts |  | $ 118,869
Commercial Real Estate Portfolio Segment [Member] | Risk Grade Eleven [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 11.00
Loans, net of unearned discounts |  | $ 85,201
Commercial Real Estate Portfolio Segment [Member] | Risk Grade Twelve [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 12.00
Loans, net of unearned discounts |  | $ 9,194
Commercial Real Estate Portfolio Segment [Member] | Risk Grade Thirteen [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 13.00
Loans, net of unearned discounts |  | $ 383

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 + Details
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