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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | $ 17,269 | $ 15,988 | $ 16,330 | $ 16,737
Charge-offs | (977) | (993) | (2,672) | (3,401)
Recoveries | 157 | 86 | 641 | 329
Provision (benefit) for loan losses | 1,400 | 622 | 3,550 | 2,038
Allowance for loan losses, Ending Balance | 17,849 | 15,703 | 17,849 | 15,703
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 5,563 | 5,218 | 5,428 | 6,035
Charge-offs | (20) | (86) | (50) | (519)
Recoveries | 36 | 37 | 167 | 84
Provision (benefit) for loan losses | (223) | (24) | (189) | (455)
Allowance for loan losses, Ending Balance | 5,356 | 5,145 | 5,356 | 5,145
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 7,641 | 6,207 | 6,753 | 5,605
Charge-offs | (22) | 0 | (22) | (20)
Recoveries | 3 | 2 | 197 | 7
Provision (benefit) for loan losses | 472 | 27 | 1,166 | 644
Allowance for loan losses, Ending Balance | 8,094 | 6,236 | 8,094 | 6,236
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 1,670 | 2,299 | 1,653 | 2,475
Charge-offs | (130) | (95) | (328) | (244)
Recoveries | 0 | 10 | 73 | 72
Provision (benefit) for loan losses | 468 | (65) | 610 | (154)
Allowance for loan losses, Ending Balance | 2,008 | 2,149 | 2,008 | 2,149
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 2,068 | 2,066 | 2,215 | 2,371
Charge-offs | (703) | (709) | (1,969) | (2,397)
Recoveries | 96 | 20 | 110 | 94
Provision (benefit) for loan losses | 627 | 545 | 1,732 | 1,854
Allowance for loan losses, Ending Balance | 2,088 | 1,922 | 2,088 | 1,922
Credit Cards [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 142 | 50 | 93 | 90
Charge-offs | (39) | (17) | (111) | (54)
Recoveries | 8 | 3 | 23 | 18
Provision (benefit) for loan losses | 0 | 36 | 106 | 18
Allowance for loan losses, Ending Balance | 111 | 72 | 111 | 72
Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses, Beginning Balance | 185 | 148 | 188 | 161
Charge-offs | (63) | (86) | (192) | (167)
Recoveries | 14 | 14 | 71 | 54
Provision (benefit) for loan losses | 56 | 103 | 125 | 131
Allowance for loan losses, Ending Balance | $ 192 | $ 179 | $ 192 | $ 179

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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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