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Allowance for Losses on Loans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (release) for loan losses	$ 750	$ (950)	$ 250	$ (950)
Charge-offs, net of (recoveries)	1,171	1,371	2,579	4,453
Loans receivable, gross	$ 13,240,402		$ 13,240,402			$ 12,853,678
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.40%		0.40%			0.42%
Allowance for loan losses	$ 133,086	$ 127,576	$ 133,086	$ 127,576	$ 131,165	$ 129,257	$ 127,155	$ 123,073
Allowance for credit losses and reserve for unfunded commitments	$ 139,336		$ 139,336
Allowance for credit losses and reserve for unfunded commitments, percent of gross loans	1.05%		1.05%
Non-accrual loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 48,941		$ 48,941			55,686
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	12,027,366		12,027,366			11,597,492
Allowance for loan losses	132,710		132,710			128,740
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	50,249		50,249			60,680
Allowance for loan losses	376		376			517
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,250		6,250			7,250
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 59,572		$ 59,572			$ 70,093
Ratio of non-performing assets to total assets	0.36%		0.36%			0.44%
Non-accrual loans	$ 48,941		$ 48,941			$ 55,686

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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, 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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