Revenue Recognition - Summary of Non Interest Income, Segregated by Revenue Streams in-Scope and Out-of-Scope of Topic 606 (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Noninterest income:
Gain on OREO, net			$ 105	$ 3,540
Other	$ 2,297	$ 1,824	6,944	4,393
Total noninterest income	11,894	10,112	46,402	32,723
Service Charges on Deposit Accounts [Member]
Noninterest income:
Revenue from contract with customer	4,833	4,295	15,039	12,431
Trust and Investment Services [Member]
Noninterest income:
Revenue from contract with customer	2,330	2,182	6,964	6,738
Bankcard Services [Member]
Noninterest income:
Revenue from contract with customer	637	875	2,614	2,637
Accounting Standards Update 2014-09 [Member]
Noninterest income:
Gain on OREO, net	0	0	129	3,540
Other	2,292	1,824	6,939	4,393
Total noninterest income	10,092	9,176	31,685	29,739
Accounting Standards Update 2014-09 [Member] \| Service Charges on Deposit Accounts [Member]
Noninterest income:
Revenue from contract with customer	4,833	4,295	15,039	12,431
Accounting Standards Update 2014-09 [Member] \| Trust and Investment Services [Member]
Noninterest income:
Revenue from contract with customer	2,330	2,182	6,964	6,738
Accounting Standards Update 2014-09 [Member] \| Bankcard Services [Member]
Noninterest income:
Revenue from contract with customer	637	875	2,614	2,637
Accounting Standards Update 2014-09 Not Adopted [Member]
Noninterest income:
Total noninterest income	$ 1,802	$ 936	$ 14,717	$ 2,984

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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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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-Publisher FASB
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