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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | $ 14,837 |  |  |  | $ 14,534 | $ 14,837 | $ 14,534 | $ 16,501
Total loans charged-off |  |  |  |  |  |  |  |  | 2,253 | 2,660 | 6,099
Total loan recoveries |  |  |  |  |  |  |  |  | 1,340 | 1,121 | 970
Net loans charged-off |  |  |  |  |  |  |  |  | 913 | 1,539 | 5,129
Total provision charged to operating expense | $ 1,100 | $ 710 | $ 330 | $ 330 | $ 623 | $ 455 | $ 232 | $ 532 | 2,470 | 1,842 | 3,162
Balance at the end of the period | $ 16,394 |  |  |  | $ 14,837 |  |  |  | 16,394 | 14,837 | 14,534
Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 377 | 758 | 3,437
Total loan recoveries |  |  |  |  |  |  |  |  | 268 | 210 | 192
Total provision charged to operating expense |  |  |  |  |  |  |  |  | 2,164 | (68) | 2,531
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 68 | 181 | 2,208
Total loan recoveries |  |  |  |  |  |  |  |  | 9 | 31 | 104
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 20 | 471 | 556
Total loan recoveries |  |  |  |  |  |  |  |  | 32 | 55 | 1
Commercial [Member] | Residential Development [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loan recoveries |  |  |  |  |  |  |  |  | 8 | 8 |
Commercial [Member] | Development & Spec Land Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 1 |  |
Total loan recoveries |  |  |  |  |  |  |  |  |  |  | 35
Commercial [Member] | Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 288 | 106 | 673
Total loan recoveries |  |  |  |  |  |  |  |  | 219 | 116 | 52
Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 89 | 213 | 288
Total loan recoveries |  |  |  |  |  |  |  |  | 44 | 97 | 69
Total provision charged to operating expense |  |  |  |  |  |  |  |  | (81) | (23) | 62
Real Estate [Member] | Residential Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 89 | 213 | 288
Total loan recoveries |  |  |  |  |  |  |  |  | 44 | 97 | 69
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 1,787 | 1,689 | 2,374
Total loan recoveries |  |  |  |  |  |  |  |  | 1,028 | 814 | 709
Total provision charged to operating expense |  |  |  |  |  |  |  |  | 387 | 1,933 | 569
Consumer [Member] | Direct Installment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 389 | 329 | 367
Total loan recoveries |  |  |  |  |  |  |  |  | 531 | 81 | 106
Consumer [Member] | Indirect Installment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 1,193 | 1,051 | 1,081
Total loan recoveries |  |  |  |  |  |  |  |  | 497 | 529 | 489
Consumer [Member] | Home Equity Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | $ 205 | 309 | 926
Total loan recoveries |  |  |  |  |  |  |  |  |  | $ 204 | $ 114

X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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 loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after recoveries, of loans and leases that have been written-off. + References No definition available. + 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 allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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