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	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Noninterest income:
Gain on OREO, net			$ 0	$ 105
Other	$ 3,778	$ 2,603	5,576	4,647
Total noninterest income	12,152	18,205	23,792	34,508
Service Charges on Deposit Accounts [Member]
Noninterest income:
Revenue from contract with customer	3,809	5,065	8,585	10,206
Trust and Investment Services [Member]
Noninterest income:
Revenue from contract with customer	2,477	2,452	4,897	4,634
Bankcard Services [Member]
Noninterest income:
Revenue from contract with customer	405	1,027	982	1,977
Accounting Standards Update 2014-09 [Member]
Noninterest income:
Gain on OREO, net		24	10	129
Other	3,778	2,603	5,576	4,647
Total noninterest income	10,469	11,171	20,050	21,593
Accounting Standards Update 2014-09 [Member] \| Service Charges on Deposit Accounts [Member]
Noninterest income:
Revenue from contract with customer	3,809	5,065	8,585	10,206
Accounting Standards Update 2014-09 [Member] \| Trust and Investment Services [Member]
Noninterest income:
Revenue from contract with customer	2,477	2,452	4,897	4,634
Accounting Standards Update 2014-09 [Member] \| Bankcard Services [Member]
Noninterest income:
Revenue from contract with customer	405	1,027	982	1,977
Accounting Standards Update 2014-09 Not Adopted [Member]
Noninterest income:
Total noninterest income	$ 1,683	$ 7,034	$ 3,742	$ 12,915

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
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