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Allowance for Losses on Loans - Additional Information (Details) - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (release) for credit losses	$ 3,000,000	$ (3,750,000)
Financing Receivable, Allowance for Credit Loss, Recovery, Including Off-Balance Sheet, Credit Loss, Liability	1,734,000	2,579,000
Allowance for credit losses on loans	170,189,000	147,513,000	$ 166,955,000	$ 149,284,000
SBA Payroll Protection Program loans	14,786,826,000		14,467,722,000
Gross loans	$ 13,051,199,000		$ 12,959,272,000
% based on $, past due	0.52%		0.24%
Non-accrual loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans			$ 29,056,000
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 66,542,000		$ 37,695,000
Ratio of non-performing assets to total assets	0.35%		0.20%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	$ 119,207,000	89,581,000	$ 109,923,000	89,335,000
SBA Payroll Protection Program loans	8,702,524,000		8,163,029,000
Gross loans	$ 7,341,847,000		$ 7,044,426,000
% based on $, past due	0.46%		0.04%
Commercial loans | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	$ 44,317,000	$ 33,676,000	$ 38,665,000	$ 32,235,000
SBA Payroll Protection Program loans	2,256,627,000		2,132,160,000
Gross loans	$ 2,243,465,000		$ 2,115,513,000
% based on $, past due	0.05%		0.04%
Commercial loans | Commercial and Industrial [Member] | SBA Payroll Protection Program, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	$ 0		$ 0
SBA Payroll Protection Program loans	$ 646,887,000		$ 762,004,000

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