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Loans and the Allowance for Credit Losses - Summary of Commercial Loans by Risk Grade (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Summary of commercial loans by risk grade |  |
Commercial loans | $ 7,702,435 | $ 7,607,333
Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 5,012,977 | 5,036,201
Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 78,880 | 51,710
Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 95,071 | 31,244
Commercial Real Estate - Land and Construction [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 510,404 | 528,072
Commercial Real Estate - Land and Construction [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 503,021 | 523,707
Commercial Real Estate - Land and Construction [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 5,742 | 2,297
Commercial Real Estate - Land and Construction [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 1,641 | 2,068
Commercial Real Estate - Improved Property [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 3,344,249 | 3,325,623
Commercial Real Estate - Improved Property [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 3,217,475 | 3,267,304
Commercial Real Estate - Improved Property [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 54,441 | 35,566
Commercial Real Estate - Improved Property [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 72,333 | 22,753
Commercial and Industrial [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 1,332,275 | 1,265,460
Commercial and Industrial [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 1,292,481 | 1,245,190
Commercial and Industrial [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 18,697 | 13,847
Commercial and Industrial [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | 21,097 | 6,423
Commercial Portfolio Segment [Member] |  |
Summary of commercial loans by risk grade |  |
Commercial loans | $ 5,186,928 | $ 5,119,155

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- Definition 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. + 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=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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