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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | $ 56,575 | $ 63,351
Collectively evaluated for impairment | 3,465,541 | 3,150,306
Loans acquired with deteriorated credit quality | 20,154 | 6,310
Non-residential real estate owner occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 6,555 | 5,542
Collectively evaluated for impairment | 452,239 | 448,261
Loans acquired with deteriorated credit quality |  |
Non-residential real estate other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 25,934 | 30,136
Collectively evaluated for impairment | 853,571 | 760,103
Loans acquired with deteriorated credit quality |  |
Residential real estate permanent mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 7,477 | 6,561
Collectively evaluated for impairment | 265,727 | 242,195
Loans acquired with deteriorated credit quality |  |
Residential real estate all other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 7,562 | 12,236
Collectively evaluated for impairment | 560,185 | 512,801
Loans acquired with deteriorated credit quality |  |
Non-consumer non-real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 6,657 | 6,329
Collectively evaluated for impairment | 821,382 | 744,272
Loans acquired with deteriorated credit quality |  |
Consumer non-real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 2,082 | 2,301
Collectively evaluated for impairment | 223,880 | 209,019
Loans acquired with deteriorated credit quality |  |
Other loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 308 | 246
Collectively evaluated for impairment | 147,903 | 143,780
Loans acquired with deteriorated credit quality |  |
Acquired loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment |  |
Collectively evaluated for impairment | 140,654 | 89,875
Loans acquired with deteriorated credit quality | $ 20,154 | $ 6,310

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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 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 + 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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