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Allowance for Loan Losses - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision (release) for credit losses	$ 500,000	$ 21,750,000	$ (1,650,000)
Recoveries, net of charge-offs	6,345,000	3,271,000
Allowance for loan losses	171,300,000	166,955,000	131,534,000
SBA PPP loans	13,833,570,000	12,792,317,000
Loans Subject to Quantitative Evaluation
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses	120,357,000
Loans Subject to Management Qualitative Evaluation
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses	50,943,000
Non-Performing Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	$ 43,625,000	$ 37,695,000
Ratio of non-performing assets to total assets	0.22%	0.20%
Financial Asset Originated
Financing Receivable, Allowance for Credit Loss [Line Items]
Non-accrual	$ 31,749,000	$ 29,056,000
Commercial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses	125,375,000	109,923,000	93,470,000
Commercial loans | Financial Asset Originated
Financing Receivable, Allowance for Credit Loss [Line Items]
Non-accrual	11,723,000	5,769,000
Commercial loans | Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses	45,957,000	38,665,000	$ 31,450,000
Commercial loans | Commercial & industrial | Financial Asset Originated
Financing Receivable, Allowance for Credit Loss [Line Items]
Non-accrual	365,000	$ 329,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for loan losses	0
SBA PPP loans	$ 305,162,000

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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