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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Financial Receivables Impaired Or Restructured [Line Items]
Individually evaluated for impairment	$ 59,775	$ 68,015
Collectively evaluated for impairment	3,292,350	3,039,138
Loans Loans acquired with deteriorated credit quality	6,813	8,943
Non-residential real estate owner occupied [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Individually evaluated for impairment	6,005	12,142
Collectively evaluated for impairment	453,341	469,558
Non-residential real estate other [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Individually evaluated for impairment	28,072	25,053
Collectively evaluated for impairment	849,430	642,817
Residential real estate permanent mortgage [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Individually evaluated for impairment	6,609	6,406
Collectively evaluated for impairment	249,609	238,260
Residential real estate all other [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Individually evaluated for impairment	10,674	12,858
Collectively evaluated for impairment	540,476	480,274
Non-consumer non-real estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Individually evaluated for impairment	5,675	8,976
Collectively evaluated for impairment	772,803	724,930
Consumer non-real estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Individually evaluated for impairment	2,448	2,316
Collectively evaluated for impairment	222,045	205,427
Other loans [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Individually evaluated for impairment	292	264
Collectively evaluated for impairment	138,575	150,218
Acquired loans [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Individually evaluated for impairment
Collectively evaluated for impairment	66,071	127,654
Loans Loans acquired with deteriorated credit quality	$ 6,813	$ 8,943

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The balance of financing receivables that were acquired with deteriorated credit quality.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

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The balance of financing receivables that were collectively evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

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The balance of financing receivables that were individually evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

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