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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | $ 16,501 |  |  |  | $ 16,501 | $ 15,992 | $ 18,270
Total loans charged-off |  |  |  |  |  |  |  | 6,099 | 4,129 | 6,250
Total loan recoveries |  |  |  |  |  |  |  | 970 | 1,580 | 2,052
Net loans charged-off (recovered) |  |  |  |  |  |  |  | 5,129 | 2,549 | 4,198
Total provision charged to operating expense | $ 342 | $ 300 | $ 1,906 | $ 614 | $ 978 | $ 1,741 | $ 339 | 3,162 | 3,058 | 1,920
Balance at the end of the period | $ 14,534 |  |  |  | $ 16,501 |  |  | 14,534 | 16,501 | 15,992
Commercial [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 3,437 | 1,802 | 2,532
Total loan recoveries |  |  |  |  |  |  |  | 192 | 773 | 668
Total provision charged to operating expense |  |  |  |  |  |  |  | 2,531 | 2,277 | 756
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 2,208 | 40 | 138
Total loan recoveries |  |  |  |  |  |  |  | 104 | 13 | 65
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 556 | 136 | 937
Total loan recoveries |  |  |  |  |  |  |  | 1 | 210 | 71
Commercial [Member] | Development & Spec Land Loans [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 173 | 182
Total loan recoveries |  |  |  |  |  |  |  | 35 | 55 |
Commercial [Member] | Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 673 | 1,453 | 1,275
Total loan recoveries |  |  |  |  |  |  |  | 52 | 495 | 532
Real Estate [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 288 | 328 | 1,055
Total loan recoveries |  |  |  |  |  |  |  | 69 | 21 | 114
Total provision charged to operating expense |  |  |  |  |  |  |  | 62 | (1,153) | 1,132
Real Estate [Member] | Residential Mortgage [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 288 | 328 | 1,055
Total loan recoveries |  |  |  |  |  |  |  | 69 | 21 | 114
Consumer [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 2,374 | 1,999 | 2,663
Total loan recoveries |  |  |  |  |  |  |  | 709 | 786 | 1,270
Total provision charged to operating expense |  |  |  |  |  |  |  | 569 | 1,934 | 32
Consumer [Member] | Direct Installment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 367 | 250 | 333
Total loan recoveries |  |  |  |  |  |  |  | 106 | 67 | 488
Consumer [Member] | Indirect Installment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 1,081 | 1,233 | 1,178
Total loan recoveries |  |  |  |  |  |  |  | 489 | 560 | 658
Consumer [Member] | Home Equity Loan [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  | 926 | 516 | 1,152
Total loan recoveries |  |  |  |  |  |  |  | $ 114 | $ 159 | $ 124

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- 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=49124121&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=49124121&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=49124121&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=49124121&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 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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