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Loans - Restructured in Troubled Debt (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Loans | Dec. 31, 2017 USD ($) Loans
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 19 | 19
Loan Balance | $ 17,360 | $ 17,303
Specific Reserve | $ 6,446 | $ 5,689
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 10 | 10
Loan Balance | $ 5,150 | $ 5,213
Specific Reserve | $ 278 | $ 245
Commercial Mortgages [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 9 | 9
Loan Balance | $ 12,210 | $ 12,090
Specific Reserve | $ 6,168 | $ 5,444
Residential Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 0 | 0
Loan Balance | $ 0 | $ 0
Specific Reserve | $ 0 | $ 0
Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 0 | 0
Loan Balance | $ 0 | $ 0
Specific Reserve | $ 0 | $ 0
Credit Cards [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 0 | 0
Loan Balance | $ 0 | $ 0
Specific Reserve | $ 0 | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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