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Allowance for Losses on Loans - Additional Information (Details) - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (release) for loan losses	$ (500,000)	$ 0
Charge-offs, net of (recoveries)	1,408,000	3,082,000
Loans receivable, gross	$ 13,020,468,000		$ 12,853,678,000
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.42%		0.42%
Allowance for loan losses	$ 131,165,000	$ 127,155,000	$ 129,257,000	$ 123,073,000
Allowance for credit losses and reserve for unfunded commitments	$ 137,415,000
Allowance for credit losses and reserve for unfunded commitments, percent of gross loans	1.06%
Non-accrual loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 51,450,000		55,686,000
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	11,833,633,000		11,597,492,000
Allowance for loan losses	130,665,000		128,740,000
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	48,525,000		60,680,000
Allowance for loan losses	500,000		517,000
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,250,000		7,250,000
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 62,730,000		$ 70,093,000
Ratio of non-performing assets to total assets	0.39%		0.44%
Non-accrual loans	$ 51,450,000		$ 55,686,000

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A valuation allowance for financing receivables that are expected to be uncollectible.

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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.

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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Amount of expense related to estimated loss from loan and lease transactions.

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Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries

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Loans and Leases Receivable, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process

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Loans and Leases Receivable, Allowance for Credit Losses and Reserve for Unfunded Commitments

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Ratio of Non-Performing Assets to Total Assets

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