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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | $ 17,682 | $ 16,674 | $ 17,373 | $ 16,234
Charge-offs | (724) | (830) | (1,486) | (1,480)
Recoveries | 60 | 70 | 188 | 141
Provision (benefit) for loan losses | 486 | 1,501 | 1,429 | 2,520
Allowances for loan losses, Ending Balance | 17,504 | 17,415 | 17,504 | 17,415
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 7,223 | 8,278 | 7,114 | 8,212
Charge-offs | (65) | (319) | (139) | (319)
Recoveries | 12 | 1 | 27 | 1
Provision (benefit) for loan losses | (572) | 136 | (404) | 202
Allowances for loan losses, Ending Balance | 6,598 | 8,096 | 6,598 | 8,096
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 5,296 | 3,704 | 5,310 | 3,536
Charge-offs | 0 | 0 | 0 | (50)
Recoveries | 0 | 10 | 50 | 10
Provision (benefit) for loan losses | 632 | 867 | 568 | 1,085
Allowances for loan losses, Ending Balance | 5,928 | 4,581 | 5,928 | 4,581
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,786 | 2,455 | 2,479 | 2,450
Charge-offs | (90) | (76) | (156) | (198)
Recoveries | 0 | 0 | 1 | 19
Provision (benefit) for loan losses | (84) | 88 | 288 | 196
Allowances for loan losses, Ending Balance | 2,612 | 2,467 | 2,612 | 2,467
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,129 | 1,972 | 2,205 | 1,763
Charge-offs | (477) | (369) | (1,000) | (768)
Recoveries | 26 | 31 | 55 | 53
Provision (benefit) for loan losses | 440 | 362 | 858 | 948
Allowances for loan losses, Ending Balance | 2,118 | 1,996 | 2,118 | 1,996
Credit Cards [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 74 | 68 | 71 | 66
Charge-offs | (44) | (2) | (86) | (23)
Recoveries | 2 | 1 | 5 | 3
Provision (benefit) for loan losses | 66 | 21 | 108 | 42
Allowances for loan losses, Ending Balance | 98 | 88 | 98 | 88
Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 174 | 197 | 194 | 207
Charge-offs | (48) | (64) | (105) | (122)
Recoveries | 20 | 27 | 50 | 55
Provision (benefit) for loan losses | 4 | 27 | 11 | 47
Allowances for loan losses, Ending Balance | $ 150 | $ 187 | $ 150 | $ 187

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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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