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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | $ 16,546 | $ 16,738 | $ 16,330 | $ 16,737
Charge-offs | (764) | (1,065) | (1,695) | (2,408)
Recoveries | 353 | 95 | 484 | 243
Provision (benefit) for loan losses | 1,134 | 220 | 2,150 | 1,416
Allowance for loan losses, Ending Balance | 17,269 | 15,988 | 17,269 | 15,988
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 4,785 | 5,627 | 5,428 | 6,035
Charge-offs | (29) | (162) | (30) | (433)
Recoveries | 119 | 39 | 131 | 47
Provision (benefit) for loan losses | 688 | (286) | 34 | (431)
Allowance for loan losses, Ending Balance | 5,563 | 5,218 | 5,563 | 5,218
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 7,357 | 6,044 | 6,753 | 5,605
Charge-offs | 0 | (20) | 0 | (20)
Recoveries | 192 | 0 | 194 | 5
Provision (benefit) for loan losses | 92 | 183 | 694 | 617
Allowance for loan losses, Ending Balance | 7,641 | 6,207 | 7,641 | 6,207
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 2,022 | 2,574 | 1,653 | 2,475
Charge-offs | (130) | (124) | (198) | (149)
Recoveries | 2 | 3 | 73 | 62
Provision (benefit) for loan losses | (224) | (154) | 142 | (89)
Allowance for loan losses, Ending Balance | 1,670 | 2,299 | 1,670 | 2,299
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 2,089 | 2,274 | 2,215 | 2,371
Charge-offs | (531) | (701) | (1,266) | (1,688)
Recoveries | 12 | 30 | 14 | 74
Provision (benefit) for loan losses | 498 | 463 | 1,105 | 1,309
Allowance for loan losses, Ending Balance | 2,068 | 2,066 | 2,068 | 2,066
Credit Cards [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 105 | 81 | 93 | 90
Charge-offs | (14) | (28) | (72) | (37)
Recoveries | 4 | 3 | 15 | 15
Provision (benefit) for loan losses | 47 | (6) | 106 | (18)
Allowance for loan losses, Ending Balance | 142 | 50 | 142 | 50
Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 188 | 138 | 188 | 161
Charge-offs | (60) | (30) | (129) | (81)
Recoveries | 24 | 20 | 57 | 40
Provision (benefit) for loan losses | 33 | 20 | 69 | 28
Allowance for loan losses, Ending Balance | $ 185 | $ 148 | $ 185 | $ 148

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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=84173941&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=84173941&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=84173941&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=98514028&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=84173941&loc=SL6953423-111524 + Details
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