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Business Combinations - Additional Information (Detail) $ in Thousands		12 Months Ended
	Jul. 06, 2018 USD ($) Branches shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 220,872	$ 220,972
PNCI
Business Acquisition [Line Items]
Receivables gross contractual amount	$ 866,189
Receivables fair value	833,381
PCI
Business Acquisition [Line Items]
Receivables gross contractual amount	1,683
Receivables fair value	1,302
FNBB
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 291,132
Issue of common stock shares \| shares	7,405,277
Amount paid in exchange for the outstanding options	$ 6,700
Number of branches added (in branches) \| Branches	12
Goodwill	$ 156,561
Core deposit intangible	$ 27,605
FNBB \| Core Deposit Intangibles
Business Acquisition [Line Items]
Finite lived intangible asset estimated useful life	6 years 2 months 12 days
Acquisition related costs		$ 0	$ 5,227	$ 530