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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Balance | $ 19,693 | $ 16,330 | $ 16,737
Charge-offs | (6,593) | (4,077) | (4,961)
Recoveries | 532 | 785 | 405
Provision for loan losses | 6,072 | 6,655 | 4,149
Allowance for loan losses, Ending Balance | 19,704 | 19,693 | 16,330
Commercial, industrial, and agricultural |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Balance | 6,160 | 5,428 | 6,035
Charge-offs | (253) | (544) | (601)
Recoveries | 171 | 235 | 89
Provision for loan losses | 1,263 | 1,041 | (95)
Allowance for loan losses, Ending Balance | 7,341 | 6,160 | 5,428
Commercial mortgages |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Balance | 9,007 | 6,753 | 5,605
Charge-offs | (3,337) | (116) | (201)
Recoveries | 30 | 197 | 8
Provision for loan losses | 1,790 | 2,173 | 1,341
Allowance for loan losses, Ending Balance | 7,490 | 9,007 | 6,753
Residential real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Balance | 2,033 | 1,653 | 2,475
Charge-offs | (315) | (466) | (499)
Recoveries | 67 | 78 | 93
Provision for loan losses | 371 | 768 | (416)
Allowance for loan losses, Ending Balance | 2,156 | 2,033 | 1,653
Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Balance | 2,179 | 2,215 | 2,371
Charge-offs | (2,279) | (2,555) | (3,324)
Recoveries | 141 | 161 | 122
Provision for loan losses | 2,336 | 2,358 | 3,046
Allowance for loan losses, Ending Balance | 2,377 | 2,179 | 2,215
Credit cards |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Balance | 120 | 93 | 90
Charge-offs | (90) | (144) | (96)
Recoveries | 33 | 27 | 22
Provision for loan losses | 40 | 144 | 77
Allowance for loan losses, Ending Balance | 103 | 120 | 93
Overdrafts |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Balance | 194 | 188 | 161
Charge-offs | (319) | (252) | (240)
Recoveries | 90 | 87 | 71
Provision for loan losses | 272 | 171 | 196
Allowance for loan losses, Ending Balance | $ 237 | $ 194 | $ 188

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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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- Definition Amount of expense related to loss from loan transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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