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Allowance for Losses on Loans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provision (release) for loan losses | $ (950) | $ (1,600) | $ (950) | $ (1,600) |  |  |  |
Charge-offs, net of (recoveries) | (1,371) | (5,216) | (4,453) | (10,512) |  |  |  |
Loans receivable, gross | $ 12,540,254 |  | $ 12,540,254 |  |  | $ 12,201,387 |  |
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.40% |  | 0.40% |  |  | 0.40% |  |
Allowance for loan losses | $ 127,576 | $ 121,922 | $ 127,576 | $ 121,922 | $ 127,155 | $ 123,073 | $ 118,456 | $ 113,494
Allowance for credit losses and reserve for unfunded commitments | $ 134,326 |  | $ 134,326 |  |  |  |  |
Allowance for credit losses and reserve for unfunded commitments, percent of gross loans | 1.07% |  | 1.07% |  |  |  |  |
Non-Accrual loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans | $ 53,808 |  | $ 53,808 |  |  | 49,580 |  |
Loans Collectively Evaluated for Impairment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 11,265,547 |  | 11,265,547 |  |  | 11,000,212 |  |
Allowance for loan losses | 126,922 |  | 126,922 |  |  | 122,947 |  |
Loans Individually Evaluated for Impairment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 115,429 |  | 115,429 |  |  | 28,553 |  |
Allowance for loan losses | 654 |  | 654 |  |  | 126 |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | 6,750 |  | 6,750 |  |  | 7,750 |  |
Non-Performing Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | $ 69,712 |  | $ 69,712 |  |  | $ 70,238 |  |
Ratio of non-performing assets to total assets | 0.45% |  | 0.45% |  |  | 0.46% |  |
Nonaccrual loans | $ 53,808 |  | $ 53,808 |  |  | $ 49,580 |  |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + 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=84173941&loc=d3e5111-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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