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Allowance for Losses on Loans - Additional Information (Details) - USD ($)	3 Months Ended				9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (release) for credit losses	$ 10,800,000			$ 0	$ 15,250,000	$ 250,000
Net (charge-offs) recoveries	(1,702,000)	$ 1,788,000	$ 2,579,000	936,000	2,665,000	3,515,000
Allowance for credit losses on loans	165,349,000	157,101,000	147,513,000	134,022,000	165,349,000	134,022,000	$ 131,534,000	$ 133,086,000	$ 129,257,000
SBA Payroll Protection Program loans	14,301,358,000				14,301,358,000		13,312,388,000
Gross loans	$ 12,898,775,000				$ 12,898,775,000		$ 13,312,388,000
% based on $, past due	0.32%				0.32%		0.29%
Non-accrual loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans							$ 33,731,000
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 44,630,000				$ 44,630,000		$ 43,826,000
Ratio of non-performing assets to total assets	0.25%				0.25%		0.27%
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	$ 106,408,000	98,704,000	89,581,000	94,803,000	$ 106,408,000	94,803,000	$ 93,470,000	93,546,000	88,178,000
SBA Payroll Protection Program loans	7,900,191,000				7,900,191,000		6,564,698,000
Gross loans	$ 6,836,049,000				$ 6,836,049,000		$ 6,564,698,000
% based on $, past due	0.15%				0.15%		0.12%
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans	$ 42,179,000	$ 38,576,000	$ 33,676,000	$ 31,071,000	$ 42,179,000	$ 31,071,000	$ 31,450,000	$ 30,574,000	$ 28,702,000
SBA Payroll Protection Program loans	2,158,000,000				2,158,000,000		1,268,695,000
Gross loans	$ 2,138,462,000				$ 2,138,462,000		$ 1,268,695,000
% based on $, past due	0.17%				0.17%		0.07%
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
SBA Payroll Protection Program loans	$ 758,955,000				$ 758,955,000

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