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Allowance for Losses on Loans - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (release) for credit losses	$ 9,000,000	$ 1,500,000	$ 15,000,000	$ 1,500,000
Net charge-offs	10,351,000	(595,000)	15,739,000	(3,179,000)
Allowance for credit losses on loans	178,069,000	170,979,000	178,069,000	170,979,000	$ 177,420,000	$ 172,808,000	$ 171,384,000	$ 171,300,000
Net loans	17,384,188,000		17,384,188,000			16,113,564,000
Gross loans	$ 17,562,257,000		$ 17,562,257,000			$ 16,286,372,000
% based on $, past due	0.31%		0.31%			0.17%
Financial Asset Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 55,276,000		$ 55,276,000			$ 34,534,000
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 67,000,000		$ 67,000,000			$ 44,554,000
Ratio of non-performing assets to total assets	0.30%		0.30%			0.21%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	$ 138,185,000	130,859,000	$ 138,185,000	130,859,000	137,665,000	$ 133,476,000	129,440,000	125,375,000
Gross loans	$ 10,488,716,000		$ 10,488,716,000			$ 9,728,501,000
% based on $, past due	0.32%		0.32%			0.08%
Commercial loans | Financial Asset Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 38,724,000		$ 38,724,000			$ 16,296,000
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	61,915,000	54,924,000	61,915,000	54,924,000	$ 63,301,000	57,210,000	$ 53,903,000	$ 45,957,000
Gross loans	$ 2,490,740,000		$ 2,490,740,000			$ 2,343,403,000
% based on $, past due	1.31%		1.31%			0.28%
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans		0		0
Net loans		$ 54,185,000		$ 54,185,000
Commercial loans | Commercial & industrial | Financial Asset Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 31,686,000		$ 31,686,000			$ 5,693,000

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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-Topic 326
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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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