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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
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

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Summary of commercial loans by risk grade.

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