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Securities - Summarizes Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 499,413
Gross Unrealized Gains	6,873
Gross Unrealized Losses	(373)
Estimated Fair Value, Total	505,913
U.S. Federal agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	422,298
Gross Unrealized Gains	2,558
Gross Unrealized Losses	(176)
Estimated Fair Value, Total	424,680
Mortgage backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,417
Gross Unrealized Gains	614
Gross Unrealized Losses
Estimated Fair Value, Total	16,031	24,709
States and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	50,604
Gross Unrealized Gains	1,386
Gross Unrealized Losses	(61)
Estimated Fair Value, Total	51,929	60,538
Other securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,094
Gross Unrealized Gains	2,315
Gross Unrealized Losses	(136)
Estimated Fair Value, Total	$ 13,273	$ 10,487

X

- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

+ References

No definition available.

+ Details

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X

- Definition

Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

No definition available.

+ Details

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X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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