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Accounting for Investments in Qualified Affordable Housing Projects - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Jan. 01, 2012
Accounting Changes and Error Corrections [Abstract] |  |  |  |  |  |  |
Cumulative effect of retrospective application of accounting principle |  |  |  |  |  |  | $ 1,100,000
Decrease in net income |  |  | $ 44,000 |  |  |  |
Impairment of investments |  |  |  | $ 0 | $ 0 | $ 0 |
Investment in low income housing | $ 19,500,000 |  |  | 19,500,000 |  | 21,300,000 |
Unfunded commitments on low income housing | 7,800,000 |  |  | 7,800,000 |  | $ 11,900,000 |
Income tax expense | 592,000 | $ 592,000 |  | 1,700,000 | 1,000,000 |  |
Tax credit and other benefit received from tax expenses | $ 839,000 | $ 821,000 |  | $ 2,500,000 | $ 1,400,000 |  |

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- Definition Investments in qualified affordable housing projects. + References No definition available. + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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