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Fair Value Measurements - Additional Information (Detail) - USD ($) | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held for sale | $ 6,425,000 | $ 12,833,000 | $ 2,874,000 | $ 4,871,000 | $ 4,158,000 | $ 5,451,000
Minimum [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unpaid principal balance of Non-accrual Non-PCI loans reviewed individually for amount of impairment | 100,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unpaid principal balance of Non-accrual Non-PCI loans reviewed collectively for amount of impairment | 100,000 |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Non-recurring Basis [Member] | Non-Performing Loans Held for Sale [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held for sale | 0 |  | 0 |  |  |
Fair Value, Inputs, Level 2 [Member] | Non-recurring Basis [Member] | Small Business Administration Loans Held for Sale [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held for sale | $ 6,400,000 |  | $ 2,900,000 |  |  |

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- Definition Impaired Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment + 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, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + Details
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