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Derivative Financial Instruments - Additional Information (Detail) | Sep. 30, 2018 USD ($) Agreement | Dec. 31, 2017 USD ($)
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Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative assets and liabilities offset in balance sheet | $ 0 |
Total notional amount of the Company's swaps | $ 204,100,000 | $ 198,500,000
Interest-rate Swap Agreements with Customers [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Number of interest-rate swap agreements | Agreement | 76 |

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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