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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2014 Minimum [Member] | Sep. 30, 2014 Maximum [Member] | Sep. 30, 2014 Significant Observable Inputs with No Active Market with Identical Characteristics [Member] Non-recurring Basis [Member] Non-Performing Loans Held for Sale [Member] | Dec. 31, 2013 Significant Observable Inputs with No Active Market with Identical Characteristics [Member] Non-recurring Basis [Member] Non-Performing Loans Held for Sale [Member] | Sep. 30, 2014 Significant Observable Inputs with No Active Market with Identical Characteristics [Member] Non-recurring Basis [Member] Small Business Administration Loans Held for Sale [Member] | Dec. 31, 2013 Significant Observable Inputs with No Active Market with Identical Characteristics [Member] Non-recurring Basis [Member] Small Business Administration Loans Held for Sale [Member] | Sep. 30, 2014 Zero Coupon Municipal Bond [Member] | Dec. 31, 2013 Zero Coupon Municipal Bond [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Zero coupon tax credit municipal bond, recorded at estimated fair value |  |  |  |  |  |  |  |  |  |  |  |  | $ 718,000 | $ 748,000
Tax credits to be received |  | 5 months 23 days |  |  |  |  |  |  |  |  |  |  |  |
Loans held for sale | 7,757,000 | 7,757,000 | 3,842,000 | 5,228,000 | 2,553,000 | 8,306,000 |  |  | 0 | 0 | 7,800,000 | 0 |  |
Impaired loans, description |  | Nonaccrual Non-PCI loans with an unpaid principal balance over $100,000 and all performing restructured loans are reviewed individually for the amount of impairment, if any. Nonaccrual Non-PCI loans with an unpaid principal balance of $100,000 or less are evaluated for impairment collectively. |  |  |  |  |  |  |  |  |  |  |  |
Unpaid principal balance of Non-accrual Non-PCI loans reviewed individually for amount of impairment |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Unpaid principal balance of Non-accrual Non-PCI loans reviewed collectively for amount of impairment |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |
Transfers of assets between Level 1 and Level 2 of fair value hierarchy | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment + References No definition available. + Details
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- Definition Tax Credit Carry Forward Period Years + References No definition available. + Details
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- Definition Transfers of assets and liabilities between fair value levels. + References No definition available. + Details
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- Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Describes the policies and procedures for identifying and measuring losses on loans when the present value of expected cash flows discounted at the loan's effective interest rate, or, alternatively, a loan's observable market price or fair value of the underlying collateral is less than the carrying amount of the loan, and sets forth the amount of the loss. Also sets forth material facts pertaining to significant loan modifications in a troubled debt restructuring, describes the method for valuing a loan deemed to be impaired or nonperforming, indicates whether income on impaired or nonperforming loans are being recognized and describes the method for recognizing the income. + 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 (b) -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 35 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=35742846&loc=d3e2555-111518 + Details
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- Definition Amount classified as loans attributable to disposal group held for sale or disposed of. 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=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 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(a)) -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 35 -Paragraph 49 -URI http://asc.fasb.org/extlink&oid=35742846&loc=d3e3084-111518 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6490209&loc=d3e48214-111002 + Details
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