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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | $ 16,738 | $ 17,682 | $ 16,737 | $ 17,373
Charge-offs | (1,065) | (724) | (2,408) | (1,486)
Recoveries | 95 | 60 | 243 | 188
Provision (benefit) for loan losses | 220 | 486 | 1,416 | 1,429
Allowances for loan losses, Ending Balance | 15,988 | 17,504 | 15,988 | 17,504
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 5,627 | 7,223 | 6,035 | 7,114
Charge-offs | (162) | (65) | (433) | (139)
Recoveries | 39 | 12 | 47 | 27
Provision (benefit) for loan losses | (286) | (572) | (431) | (404)
Allowances for loan losses, Ending Balance | 5,218 | 6,598 | 5,218 | 6,598
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 6,044 | 5,296 | 5,605 | 5,310
Charge-offs | (20) | 0 | (20) | 0
Recoveries | 0 | 0 | 5 | 50
Provision (benefit) for loan losses | 183 | 632 | 617 | 568
Allowances for loan losses, Ending Balance | 6,207 | 5,928 | 6,207 | 5,928
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,574 | 2,786 | 2,475 | 2,479
Charge-offs | (124) | (90) | (149) | (156)
Recoveries | 3 | 0 | 62 | 1
Provision (benefit) for loan losses | (154) | (84) | (89) | 288
Allowances for loan losses, Ending Balance | 2,299 | 2,612 | 2,299 | 2,612
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,274 | 2,129 | 2,371 | 2,205
Charge-offs | (701) | (477) | (1,688) | (1,000)
Recoveries | 30 | 26 | 74 | 55
Provision (benefit) for loan losses | 463 | 440 | 1,309 | 858
Allowances for loan losses, Ending Balance | 2,066 | 2,118 | 2,066 | 2,118
Credit Cards [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 81 | 74 | 90 | 71
Charge-offs | (28) | (44) | (37) | (86)
Recoveries | 3 | 2 | 15 | 5
Provision (benefit) for loan losses | (6) | 66 | (18) | 108
Allowances for loan losses, Ending Balance | 50 | 98 | 50 | 98
Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 138 | 174 | 161 | 194
Charge-offs | (30) | (48) | (81) | (105)
Recoveries | 20 | 20 | 40 | 50
Provision (benefit) for loan losses | 20 | 4 | 28 | 11
Allowances for loan losses, Ending Balance | $ 148 | $ 150 | $ 148 | $ 150

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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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