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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | $ 22,122 | $ 17,269 | $ 19,693 | $ 16,330
Charge-offs | (813) | (977) | (2,249) | (2,672)
Recoveries | 106 | 157 | 435 | 641
Provision for loan losses | 1,095 | 1,400 | 4,631 | 3,550
Allowance for loan losses, Ending Balance | 22,510 | 17,849 | 22,510 | 17,849
Commercial, Industrial, and Agricultural |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 7,143 | 5,563 | 6,160 | 5,428
Charge-offs | (30) | (20) | (61) | (50)
Recoveries | 3 | 36 | 165 | 167
Provision for loan losses | (536) | (223) | 316 | (189)
Allowance for loan losses, Ending Balance | 6,580 | 5,356 | 6,580 | 5,356
Commercial mortgages |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 10,615 | 7,641 | 9,007 | 6,753
Charge-offs | 0 | (22) | 0 | (22)
Recoveries | 0 | 3 | 0 | 197
Provision for loan losses | 682 | 472 | 2,290 | 1,166
Allowance for loan losses, Ending Balance | 11,297 | 8,094 | 11,297 | 8,094
Residential Real Estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 1,900 | 1,670 | 2,033 | 1,653
Charge-offs | (212) | (130) | (289) | (328)
Recoveries | 55 | 0 | 67 | 73
Provision for loan losses | 235 | 468 | 167 | 610
Allowance for loan losses, Ending Balance | 1,978 | 2,008 | 1,978 | 2,008
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 2,156 | 2,068 | 2,179 | 2,215
Charge-offs | (469) | (703) | (1,610) | (1,969)
Recoveries | 28 | 96 | 112 | 110
Provision for loan losses | 608 | 627 | 1,642 | 1,732
Allowance for loan losses, Ending Balance | 2,323 | 2,088 | 2,323 | 2,088
Credit Cards |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 101 | 142 | 120 | 93
Charge-offs | (8) | (39) | (53) | (111)
Recoveries | 3 | 8 | 27 | 23
Provision for loan losses | 11 | 0 | 13 | 106
Allowance for loan losses, Ending Balance | 107 | 111 | 107 | 111
Overdrafts |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 207 | 185 | 194 | 188
Charge-offs | (94) | (63) | (236) | (192)
Recoveries | 17 | 14 | 64 | 71
Provision for loan losses | 95 | 56 | 203 | 125
Allowance for loan losses, Ending Balance | $ 225 | $ 192 | $ 225 | $ 192

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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