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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | $ 16,737 | $ 17,373
Charge-offs | (1,343) | (762)
Recoveries | 148 | 128
Provision (benefit) for loan losses | 1,196 | 943
Allowances for loan losses, Ending Balance | 16,738 | 17,682
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 6,035 | 7,114
Charge-offs | (271) | (74)
Recoveries | 8 | 15
Provision (benefit) for loan losses | (145) | 168
Allowances for loan losses, Ending Balance | 5,627 | 7,223
Commercial Mortgages [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 5,605 | 5,310
Charge-offs | 0 | 0
Recoveries | 5 | 50
Provision (benefit) for loan losses | 434 | (64)
Allowances for loan losses, Ending Balance | 6,044 | 5,296
Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 2,475 | 2,479
Charge-offs | (25) | (66)
Recoveries | 59 | 1
Provision (benefit) for loan losses | 65 | 372
Allowances for loan losses, Ending Balance | 2,574 | 2,786
Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 2,371 | 2,205
Charge-offs | (987) | (523)
Recoveries | 44 | 29
Provision (benefit) for loan losses | 846 | 418
Allowances for loan losses, Ending Balance | 2,274 | 2,129
Credit Cards [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 90 | 71
Charge-offs | (9) | (42)
Recoveries | 12 | 3
Provision (benefit) for loan losses | (12) | 42
Allowances for loan losses, Ending Balance | 81 | 74
Overdrafts [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowances for loan losses, Beginning Balance | 161 | 194
Charge-offs | (51) | (57)
Recoveries | 20 | 30
Provision (benefit) for loan losses | 8 | 7
Allowances for loan losses, Ending Balance | $ 138 | $ 174

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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=49124121&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=49124121&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=49124121&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=56944662&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=49124121&loc=SL6953423-111524 + Details
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