Investment Securities - Additional Information (Detail)	12 Months Ended
Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Investment Securities [Line Items]
Number of security positions in the securities held to maturity portfolio in an unrealized loss position \| security	378	152
Fair value of investments held to maturity pledged as collateral	$ 1,300,000,000
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years	7 years 8 months
Number of security positions in the securities available for sale portfolio in an unrealized loss position \| security	545	327
Fair value of securities available for sale pledged as collateral	$ 1,100,000,000
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years	7 years 9 months
Amortized cost	$ 1,796,404,000	$ 1,511,034,000
Available for sale	1,749,544,000	1,493,905,000
Other-than-temporary impairment losses	$ 0	$ 0
Single issuer securities \| Non-Rated
Investment Securities [Line Items]
Number of security positions in the securities held to maturity portfolio in an unrealized loss position \| security	4
Other-than-temporary impaired securities
Investment Securities [Line Items]
Amortized cost	$ 198,800,000
Available for sale	$ 193,100,000
Other-than-temporary impaired securities \| Obligations of states and political subdivisions
Investment Securities [Line Items]
Investment carrying value percentage	40.60%
Investment carrying value	$ 782,700,000

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

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Amount of restricted investment in debt security measured at amortized cost (held-to-maturity).

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