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Allowance for Losses on Loans - Additional Information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) charge-off | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Sep. 30, 2014 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Sep. 30, 2013 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provision for (reversal of) loan losses | $ (1,932,000) | $ (3,000,000) | $ (11,381,000) | $ (11,936,000) |  |  |  |
Number of charge-offs experienced | charge-off |  | 2 |  |  |  |  |  |
Reversal in allowance |  |  |  | 2,399,000 |  |  |  |
Adjustments, net |  |  |  |  | $ 2,910,000 |  |  |
Allowance | 2,366,000 |  | 2,366,000 |  |  |  |  |
Loans receivable, gross | 9,256,701,000 |  | 9,256,701,000 |  | 8,669,717,000 |  |  |
Nonaccrual of interest | 65,308,000 |  | 65,308,000 |  | 87,431,000 |  |  |
Acquired loans subject to general allowance | 33,573,000 |  | 33,573,000 |  |  |  |  |
Charge-offs, net of (recoveries) | 313,000 | $ (2,219,000) |  |  |  |  |  |
Allowance for probable losses | 105,611,000 | $ 114,150,000 | 105,611,000 | 114,150,000 | 112,347,000 | $ 108,323,000 | $ 114,931,000 | $ 116,741,000
Unfunded Loan Commitment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provision for (reversal of) loan losses |  |  |  | $ 467,000 |  |  |  |
Loans Collectively Evaluated for Impairment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 8,478,557,000 |  | 8,478,557,000 |  | 8,316,874,000 |  |  |
Allowance for probable losses | 105,611,000 |  | 105,611,000 |  | 112,287,000 |  |  |
Loans Individually Evaluated for Impairment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 88,008,000 |  | 88,008,000 |  | 134,736,000 |  |  |
Allowance for probable losses | 0 |  | 0 |  | 60,000 |  |  |
Nonperforming Financing Receivable [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | $ 128,883,000 |  | $ 128,883,000 |  | $ 147,311,000 |  |  |
Total grade as a % of total net loans | 0.90% |  | 0.90% |  | 1.00% |  |  |
Nonaccrual of interest | $ 65,308,000 |  | $ 65,308,000 |  | $ 87,431,000 |  |  |

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
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