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Allowance for Losses on Loans - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (release) for credit losses	$ 0	$ 8,200,000	$ 3,000,000	$ 4,450,000
Net (charge-offs) recoveries	2,464,000	1,788,000	4,198,000	4,367,000
Allowance for credit losses on loans	172,653,000	157,101,000	172,653,000	157,101,000	$ 170,189,000	$ 166,955,000	$ 147,513,000	$ 149,284,000
Loans receivable, net of allowance for loan losses	13,035,423,000		13,035,423,000			12,792,317,000
Gross PPP loans	15,265,588,000		15,265,588,000			14,467,722,000
Gross loans	$ 13,208,075,000		$ 13,208,075,000			$ 12,959,272,000
% based on $, past due	0.29%		0.29%			0.24%
Financial Asset Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 39,955,000		$ 39,955,000			$ 29,056,000
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 48,943,000		$ 48,943,000			$ 37,695,000
Ratio of non-performing assets to total assets	0.25%		0.25%			0.20%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	$ 125,444,000	98,704,000	$ 125,444,000	98,704,000	119,207,000	$ 109,923,000	89,581,000	89,335,000
Gross PPP loans	9,387,560,000		9,387,560,000			8,163,029,000
Gross loans	$ 7,726,098,000		$ 7,726,098,000			$ 7,044,426,000
% based on $, past due	0.14%		0.14%			0.04%
Commercial loans | Financial Asset Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 13,821,000		$ 13,821,000			$ 5,769,000
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	47,794,000	$ 38,576,000	47,794,000	$ 38,576,000	$ 44,317,000	38,665,000	$ 33,676,000	$ 32,235,000
Gross PPP loans	2,471,823,000		2,471,823,000			2,132,160,000
Gross loans	$ 2,452,585,000		$ 2,452,585,000			$ 2,115,513,000
% based on $, past due	0.08%		0.08%			0.04%
Commercial loans | Commercial & industrial | Financial Asset Originated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 832,000		$ 832,000			$ 329,000
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			0
Loans receivable, net of allowance for loan losses	695,752,000		695,752,000			745,081,000
Gross PPP loans	$ 711,405,000		$ 711,405,000			$ 762,004,000

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