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Summary of Financial Effects of Troubled Debt Restructurings (Detail) | 3 Months Ended
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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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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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