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Summary of Financial Effects of Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) Investment	Jun. 30, 2018 USD ($) Investment	Jun. 30, 2019 USD ($) Investment	Jun. 30, 2018 USD ($) Investment
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment	15	6		13
Pre-Modification Recorded Investment				$ 6,680
Post-Modification Recorded Investment				4,074
Trouble debt restructuring, charge-off amount				$ 2,476
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment			30	12
Pre-Modification Recorded Investment	$ 19,350	$ 2,613	$ 23,544	$ 5,780
Post-Modification Recorded Investment	$ 18,004	$ 1,420	$ 21,092	$ 3,174
Weighted Average Interest Rate, Pre-Modification	5.31%	3.27%	4.95%	3.27%
Weighted Average Interest Rate, Post-Modification	5.45%	3.05%	5.09%	3.14%
Trouble debt restructuring, charge-off amount	$ 1,346	$ 1,158	$ 2,452	$ 2,476
Acquisition, development, and construction
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment				1
Pre-Modification Recorded Investment				$ 900
Post-Modification Recorded Investment				$ 900
Weighted Average Interest Rate, Pre-Modification				4.50%
Weighted Average Interest Rate, Post-Modification				4.50%

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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