Revenue Recognition - Summary of Non Interest Income, Segregated by Revenue Streams in-Scope and Out-of-Scope of Topic 606 (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Noninterest income:
Gain on OREO, net	$ 3,546	$ 6	$ (20)
Other	6,588	9,632	4,277
Total noninterest income	43,481	42,118	35,552
Service Charges on Deposit Accounts [Member]
Noninterest income:
Revenue from contract with customer	17,070	15,809	15,066
Trust and Investment Services [Member]
Noninterest income:
Revenue from contract with customer	8,774	9,845	9,595
Bankcard Services [Member]
Noninterest income:
Revenue from contract with customer	3,485	3,406	2,921
Accounting Standards Update 2014-09 [Member]
Noninterest income:
Gain on OREO, net	3,546	6	(20)
Other	6,588	4,888	3,457
Total noninterest income	39,463	33,954	31,019
Accounting Standards Update 2014-09 [Member] \| Service Charges on Deposit Accounts [Member]
Noninterest income:
Revenue from contract with customer	17,070	15,809	15,066
Accounting Standards Update 2014-09 [Member] \| Trust and Investment Services [Member]
Noninterest income:
Revenue from contract with customer	8,774	9,845	9,595
Accounting Standards Update 2014-09 [Member] \| Bankcard Services [Member]
Noninterest income:
Revenue from contract with customer	3,485	3,406	2,921
Accounting Standards Update 2014-09 Not Adopted [Member]
Noninterest income:
Total noninterest income	$ 4,018	$ 8,164	$ 4,533

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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-Name Accounting Standards Codification
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-SubTopic 220
-Section S99
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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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