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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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- Definition 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 + Details
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- Definition 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 + Details
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