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Accounting for Investments in Qualified Affordable Housing Projects - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2012 | Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
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 |  | $ 20,100,000 |  |  | 20,100,000 |  | 21,300,000
Unfunded commitments on low income housing |  | 8,500,000 |  |  | 8,500,000 |  | $ 11,900,000
Income tax expense |  | 586,000 | $ 276,000 |  | 1,200,000 | 447,000 |
Tax credit and other benefit received from tax expenses |  | $ 832,000 | $ 423,000 |  | $ 1,600,000 | $ 665,000 |

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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=31042434&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 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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