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Business Combinations - Additional Information (Detail)		3 Months Ended
Business Combinations - Additional Information (Detail)	Jul. 06, 2018 USD ($) Branches shares	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill recognized		$ 220,972,000		$ 220,972,000
PNCI [Member]
Business Acquisition [Line Items]
Receivables gross contractual amount		866,189,000
Receivables fair value		833,381,000
PCI [Member]
Business Acquisition [Line Items]
Receivables gross contractual amount		1,683,000
Receivables fair value		1,302,000
FNBB [Member]
Business Acquisition [Line Items]
Total consideration value	$ 291,132,000
Issue of common stock shares \| shares	7,405,277
Amount paid in exchange for the outstanding options	$ 6,700,000
Number of branches added \| Branches	12
Goodwill recognized	$ 156,661,000
Recognized intangible related to acquisition	27,605,000
FNBB [Member] \| Core Deposit Intangibles [Member]
Business Acquisition [Line Items]
Recognized intangible related to acquisition	$ 27,605,000
Finite lived intangible asset estimated useful life	6 years 2 months 12 days
Acquisition related costs		$ 0	$ 476,000