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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 18,900,365,000		$ 16,299,332,000
Ratio of loan type to all loans	100.00%		100.00%
Allowance for credit losses on loans	$ 170,979,000	$ 171,384,000	$ 171,300,000	$ 170,784,000	$ 172,653,000	$ 166,955,000
Loans in process	3,083,573,000		2,232,836,000
Net deferred fees, costs and discounts	80,648,000		61,626,000
Total loan contra accounts	3,335,200,000		2,465,762,000
Net loans	15,565,165,000		13,833,570,000
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 11,886,654,000		$ 10,160,647,000
Ratio of loan type to all loans	62.90%		62.30%
Allowance for credit losses on loans	$ 130,859,000	129,440,000	$ 125,375,000	123,519,000	125,444,000	109,923,000
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,494,594,000		$ 2,291,477,000
Ratio of loan type to all loans	13.20%		14.00%
Allowance for credit losses on loans	$ 12,574,000	14,463,000	$ 16,949,000	17,668,000	17,776,000	13,853,000
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,899,057,000		$ 2,443,845,000
Ratio of loan type to all loans	15.30%		15.00%
Allowance for credit losses on loans	$ 25,300,000	24,682,000	$ 23,437,000	23,885,000	26,822,000	22,516,000
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,351,030,000		$ 2,314,654,000
Ratio of loan type to all loans	12.40%		14.20%
Allowance for credit losses on loans	$ 54,924,000	53,903,000	$ 45,957,000	45,538,000	47,794,000	38,665,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	55,000,000		312,000,000
Allowance for credit losses on loans	0		0
Net loans	54,185,000		305,162,000
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 3,896,740,000		$ 2,888,214,000
Ratio of loan type to all loans	20.60%		17.70%
Allowance for credit losses on loans	$ 25,834,000	22,707,000	$ 25,585,000	24,823,000	22,549,000	24,156,000
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 245,233,000		$ 222,457,000
Ratio of loan type to all loans	1.30%		1.40%
Allowance for credit losses on loans	$ 12,227,000	13,685,000	$ 13,447,000	11,605,000	10,503,000	10,733,000
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 7,013,711,000		$ 6,138,685,000
Ratio of loan type to all loans	37.10%		37.70%
Allowance for credit losses on loans	$ 40,120,000	41,944,000	$ 45,925,000	47,265,000	47,209,000	57,032,000
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 943,858,000		$ 783,221,000
Ratio of loan type to all loans	5.00%		4.80%
Allowance for credit losses on loans	$ 3,354,000	3,129,000	$ 4,907,000	3,522,000	3,248,000	3,555,000
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 5,652,897,000		$ 4,951,627,000
Ratio of loan type to all loans	29.90%		30.40%
Allowance for credit losses on loans	$ 26,217,000	28,992,000	$ 30,978,000	34,190,000	35,108,000	45,186,000
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 158,485,000		$ 149,956,000
Ratio of loan type to all loans	0.80%		0.90%
Allowance for credit losses on loans	$ 5,220,000	5,105,000	$ 4,939,000	3,711,000	3,292,000	2,729,000
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 185,427,000		$ 165,989,000
Ratio of loan type to all loans	1.00%		1.00%
Allowance for credit losses on loans	$ 2,632,000	2,475,000	$ 2,390,000	2,213,000	2,226,000	2,571,000
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 73,044,000		$ 87,892,000
Ratio of loan type to all loans	0.40%		0.50%
Allowance for credit losses on loans	$ 2,697,000	$ 2,243,000	$ 2,711,000	$ 3,629,000	$ 3,335,000	$ 2,991,000

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

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Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

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Amount of undisbursed portion of financing receivable balance. Excludes financing receivable covered under loss sharing agreement.

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