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Loans - Weighted Average Risk Grades for All Commercial Loans by Class (Detail) $ in Thousands | Jun. 30, 2021 USD ($) Grade | Dec. 31, 2020 USD ($) Grade
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income | $ 16,596,326 | $ 17,481,309
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.32 | 6.45
Loans and Leases Receivable, Net of Deferred Income | $ 4,755,345 | $ 4,955,341
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.73 | 6.85
Loans and Leases Receivable, Net of Deferred Income | $ 1,023,202 | $ 1,235,198
Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.28 | 7.34
Loans and Leases Receivable, Net of Deferred Income | $ 5,889,737 | $ 5,796,653
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.17 | 7.22
Loans and Leases Receivable, Net of Deferred Income | $ 1,166,309 | $ 1,223,814
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.26 | 7.32
Loans and Leases Receivable, Net of Deferred Income | $ 7,056,046 | $ 7,020,467
Risk Grade One To Eight [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.04 | 6.13
Loans and Leases Receivable, Net of Deferred Income | $ 4,373,376 | $ 4,506,121
Risk Grade One To Eight [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.03 | 5.99
Loans and Leases Receivable, Net of Deferred Income | $ 859,463 | $ 968,144
Risk Grade One To Eight [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.90 | 6.97
Loans and Leases Receivable, Net of Deferred Income | $ 5,107,543 | $ 5,047,873
Risk Grade One To Eight [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.08 | 6.99
Loans and Leases Receivable, Net of Deferred Income | $ 1,114,567 | $ 1,110,025
Risk Grade One To Eight [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 6.98
Loans and Leases Receivable, Net of Deferred Income |  | $ 6,157,898
Risk Grade Nine [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans and Leases Receivable, Net of Deferred Income | $ 240,055 | $ 256,198
Risk Grade Nine [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans and Leases Receivable, Net of Deferred Income | $ 66,359 | $ 133,547
Risk Grade Nine [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans and Leases Receivable, Net of Deferred Income | $ 373,909 | $ 325,227
Risk Grade Nine [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans and Leases Receivable, Net of Deferred Income | $ 50,075 | $ 72,287
Risk Grade Nine [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 9.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 397,514
Risk Grade Ten [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans and Leases Receivable, Net of Deferred Income | $ 68,734 | $ 125,977
Risk Grade Ten [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans and Leases Receivable, Net of Deferred Income | $ 9,065 | $ 46,427
Risk Grade Ten [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans and Leases Receivable, Net of Deferred Income | $ 253,053 | $ 258,454
Risk Grade Ten [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans and Leases Receivable, Net of Deferred Income | $ 0 | $ 38,962
Risk Grade Ten [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 10.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 297,416
Risk Grade Eleven [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans and Leases Receivable, Net of Deferred Income | $ 57,011 | $ 47,196
Risk Grade Eleven [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans and Leases Receivable, Net of Deferred Income | $ 62,532 | $ 63,912
Risk Grade Eleven [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans and Leases Receivable, Net of Deferred Income | $ 142,052 | $ 149,362
Risk Grade Eleven [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans and Leases Receivable, Net of Deferred Income | $ 0 | $ 856
Risk Grade Eleven [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 11.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 150,218
Risk Grade Twelve [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans and Leases Receivable, Net of Deferred Income | $ 12,343 | $ 14,528
Risk Grade Twelve [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans and Leases Receivable, Net of Deferred Income | $ 11,973 | $ 13,741
Risk Grade Twelve [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans and Leases Receivable, Net of Deferred Income | $ 12,430 | $ 15,224
Risk Grade Twelve [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans and Leases Receivable, Net of Deferred Income | $ 1,467 | $ 1,684
Risk Grade Twelve [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 12.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 16,908
Risk Grade Thirteen [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans and Leases Receivable, Net of Deferred Income | $ 3,826 | $ 5,321
Risk Grade Thirteen [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans and Leases Receivable, Net of Deferred Income | $ 13,810 | $ 9,427
Risk Grade Thirteen [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans and Leases Receivable, Net of Deferred Income | $ 750 | $ 513
Risk Grade Thirteen [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans and Leases Receivable, Net of Deferred Income | $ 200 | $ 0
Risk Grade Thirteen [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade |  | 13.00
Loans and Leases Receivable, Net of Deferred Income |  | $ 513

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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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