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Summary of Financial Effects of Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Investment	Sep. 30, 2018 USD ($) Investment	Sep. 30, 2019 USD ($) Investment	Sep. 30, 2018 USD ($) Investment
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment				19
Pre-Modification Recorded Investment				$ 7,814
Post-Modification Recorded Investment				5,286
Trouble debt restructuring, charge-off amount				$ 2,308
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment	28	6	58	18
Pre-Modification Recorded Investment	$ 7,366	$ 1,848	$ 30,910	$ 6,914
Post-Modification Recorded Investment	$ 7,086	$ 1,212	$ 28,179	$ 4,386
Weighted Average Interest Rate, Pre-Modification	2.99%	3.36%	4.48%	3.30%
Weighted Average Interest Rate, Post-Modification	2.82%	3.28%	4.52%	3.18%
Trouble debt restructuring, charge-off amount	$ 280	$ 545	$ 2,731	$ 2,308
Capitalized interest	$ 3		$ 3
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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Number of financing receivables that have been modified by troubled debt restructurings.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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-Topic 310
-SubTopic 10
-Section 50
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-Publisher FASB
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The gross interest income that would have been recorded in the period on troubled debt restructurings, if the loans had been current in accordance with their original terms and had been outstanding throughout the period or since origination, if held for part of the period.

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