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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | $ 20,756 | $ 16,546 | $ 19,693 | $ 16,330
Charge-offs | (710) | (764) | (1,436) | (1,695)
Recoveries | 171 | 353 | 329 | 484
Provision for loan losses | 1,905 | 1,134 | 3,536 | 2,150
Allowance for loan losses, Ending Balance | 22,122 | 17,269 | 22,122 | 17,269
Commercial, Industrial, and Agricultural |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 6,282 | 4,785 | 6,160 | 5,428
Charge-offs | 0 | (29) | (31) | (30)
Recoveries | 94 | 119 | 162 | 131
Provision for loan losses | 767 | 688 | 852 | 34
Allowance for loan losses, Ending Balance | 7,143 | 5,563 | 7,143 | 5,563
Commercial mortgages |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 10,020 | 7,357 | 9,007 | 6,753
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 192 | 0 | 194
Provision for loan losses | 595 | 92 | 1,608 | 694
Allowance for loan losses, Ending Balance | 10,615 | 7,641 | 10,615 | 7,641
Residential Real Estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 2,052 | 2,022 | 2,033 | 1,653
Charge-offs | (77) | (130) | (77) | (198)
Recoveries | 9 | 2 | 12 | 73
Provision for loan losses | (84) | (224) | (68) | 142
Allowance for loan losses, Ending Balance | 1,900 | 1,670 | 1,900 | 1,670
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 2,065 | 2,089 | 2,179 | 2,215
Charge-offs | (551) | (531) | (1,141) | (1,266)
Recoveries | 35 | 12 | 84 | 14
Provision for loan losses | 607 | 498 | 1,034 | 1,105
Allowance for loan losses, Ending Balance | 2,156 | 2,068 | 2,156 | 2,068
Credit Cards |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 123 | 105 | 120 | 93
Charge-offs | (26) | (14) | (45) | (72)
Recoveries | 17 | 4 | 24 | 15
Provision for loan losses | (13) | 47 | 2 | 106
Allowance for loan losses, Ending Balance | 101 | 142 | 101 | 142
Overdrafts |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Allowance for loan losses, Beginning Balance | 214 | 188 | 194 | 188
Charge-offs | (56) | (60) | (142) | (129)
Recoveries | 16 | 24 | 47 | 57
Provision for loan losses | 33 | 33 | 108 | 69
Allowance for loan losses, Ending Balance | $ 207 | $ 185 | $ 207 | $ 185

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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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