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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, January 1, 2016 | $ 16,330 | $ 16,737
Charge-offs | (931) | (1,343)
Recoveries | 131 | 148
Provision (benefit) for loan losses | 1,016 | 1,196
Allowance for loan losses, March 31, 2016 | 16,546 | 16,738
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, January 1, 2016 | 5,428 | 6,035
Charge-offs | (1) | (271)
Recoveries | 12 | 8
Provision (benefit) for loan losses | (654) | (145)
Allowance for loan losses, March 31, 2016 | 4,785 | 5,627
Commercial Mortgages [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, January 1, 2016 | 6,753 | 5,605
Charge-offs | 0 | 0
Recoveries | 2 | 5
Provision (benefit) for loan losses | 602 | 434
Allowance for loan losses, March 31, 2016 | 7,357 | 6,044
Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, January 1, 2016 | 1,653 | 2,475
Charge-offs | (68) | (25)
Recoveries | 71 | 59
Provision (benefit) for loan losses | 366 | 65
Allowance for loan losses, March 31, 2016 | 2,022 | 2,574
Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, January 1, 2016 | 2,215 | 2,371
Charge-offs | (735) | (987)
Recoveries | 2 | 44
Provision (benefit) for loan losses | 607 | 846
Allowance for loan losses, March 31, 2016 | 2,089 | 2,274
Credit Cards [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, January 1, 2016 | 93 | 90
Charge-offs | (58) | (9)
Recoveries | 11 | 12
Provision (benefit) for loan losses | 59 | (12)
Allowance for loan losses, March 31, 2016 | 105 | 81
Overdrafts [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses, January 1, 2016 | 188 | 161
Charge-offs | (69) | (51)
Recoveries | 33 | 20
Provision (benefit) for loan losses | 36 | 8
Allowance for loan losses, March 31, 2016 | $ 188 | $ 138

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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