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Summary of Financial Effects of Troubled Debt Restructurings (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($) Investment	Mar. 31, 2018 USD ($) Investment
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment		7
Pre-Modification Recorded Investment		$ 4,066,000
Post-Modification Recorded Investment		2,654,000
Trouble debt restructuring, charge-off amount		$ 1,318,000
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment	15	6
Pre-Modification Recorded Investment	$ 4,194	$ 3,166,000
Post-Modification Recorded Investment	$ 3,088,000	$ 1,754,000
Weighted Average Interest Rate, Pre-Modification	3.26%	3.28%
Weighted Average Interest Rate, Post-Modification	2.98%	3.21%
Trouble debt restructuring, charge-off amount	$ 1,106,000	$ 1,318,000
Acquisition, development, and construction
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment		1
Pre-Modification Recorded Investment		$ 900,000
Post-Modification Recorded Investment		$ 900,000
Weighted Average Interest Rate, Pre-Modification		4.50%
Weighted Average Interest Rate, Post-Modification		4.50%

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Number of financing receivables that have been modified by troubled debt restructurings.

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