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Securities - Additional Information (Detail)	Apr. 01, 2014 USD ($) Security	Sep. 30, 2015 USD ($)
Amortized Cost and Fair Value Debt Securities [Abstract]
Unrealized loss, other than temporary securities		$ 0
Number of securities | Security	319
Aggregate fair value of securities	$ 167,100,000
Gain/Loss from net unrealized holdings, Net of tax	1,300,000
Unrealized gain or loss, Held to maturity	$ 0

X

- Definition

Amortized Cost and Fair Value Debt Securities [Abstract]

+ References

No definition available.

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- Definition

Available for sale securities transfers to held to maturity fair value.

+ References

No definition available.

+ Details

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X

- Definition

Number of available for sale securities transfers to held to maturity.

+ References

No definition available.

+ Details

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X

- Definition

Total of accumulated other comprehensive loss related to that portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 220



-SubTopic 10



-Section 45



-Paragraph 14A



-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

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- Definition

The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 9



-Subparagraph (d)



-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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- Definition

This item represents the unrealized gain (loss) related to held-to-maturity securities transferred to another category of investments in debt and equity securities (trading or available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 10



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563

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