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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 14,786,826,000	$ 14,467,722,000
Ratio of loan type to all loans	100.00%	100.00%
Allowance for credit losses on loans	$ 170,189,000	$ 166,955,000	$ 147,513,000	$ 149,284,000
Loans in process	1,679,972,000	1,456,072,000
Net deferred fees, costs and discounts	55,655,000	52,378,000
Total loan contra accounts	1,905,816,000	1,675,405,000
Net loans	12,881,010,000	12,792,317,000
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 8,702,524,000	$ 8,163,029,000
Ratio of loan type to all loans	58.90%	56.30%
Allowance for credit losses on loans	$ 119,207,000	$ 109,923,000	89,581,000	89,335,000
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 1,610,796,000	$ 1,538,762,000
Ratio of loan type to all loans	10.90%	10.60%
Allowance for credit losses on loans	$ 14,363,000	$ 13,853,000	10,506,000	10,404,000
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 1,954,154,000	$ 1,895,086,000
Ratio of loan type to all loans	13.20%	13.10%
Allowance for credit losses on loans	$ 23,496,000	$ 22,516,000	13,067,000	13,024,000
Commercial loans | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,256,627,000	$ 2,132,160,000
Ratio of loan type to all loans	15.30%	14.70%
Allowance for credit losses on loans	$ 44,317,000	$ 38,665,000	33,676,000	32,235,000
Commercial loans | Commercial and Industrial [Member] | SBA Payroll Protection Program, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	646,887,000	762,004,000
Allowance for credit losses on loans	0	0
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,687,708,000	$ 2,403,276,000
Ratio of loan type to all loans	18.20%	16.60%
Allowance for credit losses on loans	$ 26,365,000	$ 24,156,000	21,919,000	22,768,000
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 193,239,000	$ 193,745,000
Ratio of loan type to all loans	1.30%	1.30%
Allowance for credit losses on loans	$ 10,666,000	$ 10,733,000	10,413,000	10,904,000
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 6,084,302,000	$ 6,304,693,000
Ratio of loan type to all loans	41.10%	43.70%
Allowance for credit losses on loans	$ 50,982,000	$ 57,032,000	57,932,000	59,949,000
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 659,364,000	$ 674,879,000
Ratio of loan type to all loans	4.50%	4.70%
Allowance for credit losses on loans	$ 3,594,000	$ 3,555,000	2,930,000	2,880,000
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 5,063,053,000	$ 5,304,689,000
Ratio of loan type to all loans	34.20%	36.70%
Allowance for credit losses on loans	$ 38,613,000	$ 45,186,000	46,356,000	47,771,000
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 110,841,000	$ 102,263,000
Ratio of loan type to all loans	0.70%	0.70%
Allowance for credit losses on loans	$ 2,958,000	$ 2,729,000	2,567,000	2,635,000
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 139,752,000	$ 139,703,000
Ratio of loan type to all loans	0.90%	1.00%
Allowance for credit losses on loans	$ 2,362,000	$ 2,571,000	2,034,000	2,048,000
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 111,292,000	$ 83,159,000
Ratio of loan type to all loans	0.80%	0.60%
Allowance for credit losses on loans	$ 3,455,000	$ 2,991,000	$ 4,045,000	$ 4,615,000

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