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Loans Receivable and Allowance for Loan Losses - Average Recorded Investment in Impaired Loans and Related Interest Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 Contract | Sep. 30, 2013 | Sep. 30, 2014 Contract | Sep. 30, 2013 | Dec. 31, 2013 Contract
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable Modified Balance End Of Period Number Of Contract | 25 |  | 25 |  | 12
Financing Receivable Modified Balance End Of Period | $ 4,153 |  | $ 4,153 |  | $ 7,535
Average Impaired Balance | 20,497 | 20,923 | 21,718 | 20,044 |
Interest Income Recognized | 72 | 187 | 216 | 365 |
Commercial Real Estate [Member] | Owner-Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 3,681 | 4,249 | 3,965 | 3,270 |
Interest Income Recognized | 1 | 41 | 9 | 99 |
Commercial Real Estate [Member] | Non-Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 7,361 | 3,980 | 7,205 | 3,605 |
Interest Income Recognized | 46 | 50 | 137 | 86 |
Commercial Real Estate [Member] | Multi - Family [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 98 | 168 | 234 | 89 |
Interest Income Recognized | 0 | 16 | 0 | 16 |
Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 1,905 | 5,108 | 2,603 | 4,875 |
Interest Income Recognized | 0 | 45 | 2 | 60 |
Acquisition and Development [Member] | 1-4 Family Residential Construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 0 | 345 | 0 | 602 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Acquisition and Development [Member] | Commercial and Land Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 1,286 | 2,613 | 1,787 | 2,967 |
Interest Income Recognized | 9 | 0 | 20 | 2 |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 1,263 | 1,875 | 1,676 | 1,724 |
Interest Income Recognized | 0 | 0 | 2 | 65 |
Residential Mortgage [Member] | First Lien [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 4,772 | 2,421 | 4,068 | 2,528 |
Interest Income Recognized | 15 | 29 | 45 | 31 |
Residential Mortgage [Member] | Home Equity - Term [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 72 | 47 | 90 | 47 |
Interest Income Recognized | 0 | 2 | 0 | 2 |
Residential Mortgage [Member] | Home Equity - Lines of Credit [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 49 | 116 | 85 | 336 |
Interest Income Recognized | 0 | 4 | 0 | 4 |
Installment and Other Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Impaired Balance | 10 | 1 | 5 | 1 |
Interest Income Recognized | 1 | 0 | 1 | 0 |
Nonaccruing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable Modified Balance End Of Period Number Of Contract | 15 |  | 15 |  | 6
Financing Receivable Modified Balance End Of Period | 2,418 |  | 2,418 |  | 1,547
Nonaccruing [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable Modified Balance End Of Period Number Of Contract | 1 |  | 1 |  | 1
Financing Receivable Modified Balance End Of Period | 49 |  | 49 |  | 71
Nonaccruing [Member] | Commercial Real Estate [Member] | Non-Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable Modified Balance End Of Period Number Of Contract | 1 |  | 1 |  | 1
Financing Receivable Modified Balance End Of Period | 686 |  | 686 |  | 694
Nonaccruing [Member] | Commercial Real Estate [Member] | Non-Owner Occupied Residential [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable Modified Balance End Of Period Number Of Contract | 0 |  | 0 |  | 1
Financing Receivable Modified Balance End Of Period | 0 |  | 0 |  | 193
Nonaccruing [Member] | Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable Modified Balance End Of Period Number Of Contract | 0 |  | 0 |  | 2
Financing Receivable Modified Balance End Of Period | 0 |  | 0 |  | 310
Nonaccruing [Member] | Residential Mortgage [Member] | First Lien [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable Modified Balance End Of Period Number Of Contract | 12 |  | 12 |  | 1
Financing Receivable Modified Balance End Of Period | 1,669 |  | 1,669 |  | 279
Nonaccruing [Member] | Residential Mortgage [Member] | Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable Modified Balance End Of Period Number Of Contract | 1 |  | 1 |  | 0
Financing Receivable Modified Balance End Of Period | $ 14 |  | $ 14 |  | $ 0

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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