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Loans Receivable and Allowance for Loan Losses - Number of Loans Modified and Their Pre-Modification and Post-Modification Investment Balances (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 Contract | Sep. 30, 2013 Contract | Sep. 30, 2014 Contract | Sep. 30, 2013 Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 5 | 4 | 19 | 5
Pre-Modification Recorded Investment | $ 321 | $ 3,607 | $ 1,844 | $ 4,131
Post-Modification Recorded Investment | 299 | 3,607 | 1,755 | 4,131
Commercial Real Estate [Member] | Owner-Occupied [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 0 | 2 | 0 | 2
Pre-Modification Recorded Investment | 0 | 150 | 0 | 150
Post-Modification Recorded Investment | 0 | 150 | 0 | 150
Commercial Real Estate [Member] | Non-Owner Occupied [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 0 | 2 | 0 | 2
Pre-Modification Recorded Investment | 0 | 3,457 | 0 | 3,457
Post-Modification Recorded Investment | 0 | 3,457 | 0 | 3,457
Acquisition and Development [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts |  |  | 0 | 1
Pre-Modification Recorded Investment |  |  | 0 | 524
Post-Modification Recorded Investment |  |  | 0 | 524
Residential Mortgage [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 4 | 0 | 18 | 0
Pre-Modification Recorded Investment | 285 | 0 | 1,808 | 0
Post-Modification Recorded Investment | 285 | 0 | 1,741 | 0
Installment and Other Loans [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 1 | 0 | 1 | 0
Pre-Modification Recorded Investment | 36 | 0 | 36 | 0
Post-Modification Recorded Investment | $ 14 | $ 0 | $ 14 | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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