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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 15,265,588,000		$ 14,467,722,000
Ratio of loan type to all loans	100.00%		100.00%
Allowance for credit losses on loans	$ 172,653,000	$ 170,189,000	$ 166,955,000	$ 157,101,000	$ 147,513,000	$ 149,284,000
Loans in process	1,982,225,000		1,456,072,000
Net deferred fees, costs and discounts	75,287,000		52,378,000
Total loan contra accounts	2,230,165,000		1,675,405,000
Net loans	13,035,423,000		12,792,317,000
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 9,387,560,000		$ 8,163,029,000
Ratio of loan type to all loans	61.50%		56.30%
Allowance for credit losses on loans	$ 125,444,000	119,207,000	$ 109,923,000	98,704,000	89,581,000	89,335,000
Commercial loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,008,192,000		$ 1,538,762,000
Ratio of loan type to all loans	13.20%		10.60%
Allowance for credit losses on loans	$ 17,776,000	14,363,000	$ 13,853,000	11,742,000	10,506,000	10,404,000
Commercial loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,226,560,000		$ 1,895,086,000
Ratio of loan type to all loans	14.60%		13.10%
Allowance for credit losses on loans	$ 26,822,000	23,496,000	$ 22,516,000	14,639,000	13,067,000	13,024,000
Commercial loans | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,471,823,000		$ 2,132,160,000
Ratio of loan type to all loans	16.20%		14.70%
Allowance for credit losses on loans	$ 47,794,000	44,317,000	$ 38,665,000	38,576,000	33,676,000	32,235,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	711,405,000		762,004,000
Allowance for credit losses on loans	0		0
Net loans	695,752,000		745,081,000
Commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 2,495,961,000		$ 2,403,276,000
Ratio of loan type to all loans	16.30%		16.60%
Allowance for credit losses on loans	$ 22,549,000	26,365,000	$ 24,156,000	23,348,000	21,919,000	22,768,000
Commercial loans | Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 185,024,000		$ 193,745,000
Ratio of loan type to all loans	1.20%		1.30%
Allowance for credit losses on loans	$ 10,503,000	10,666,000	$ 10,733,000	10,399,000	10,413,000	10,904,000
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 5,878,028,000		$ 6,304,693,000
Ratio of loan type to all loans	38.50%		43.70%
Allowance for credit losses on loans	$ 47,209,000	50,982,000	$ 57,032,000	58,397,000	57,932,000	59,949,000
Consumer loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 678,469,000		$ 674,879,000
Ratio of loan type to all loans	4.50%		4.70%
Allowance for credit losses on loans	$ 3,248,000	3,594,000	$ 3,555,000	3,175,000	2,930,000	2,880,000
Consumer loans | Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 4,828,535,000		$ 5,304,689,000
Ratio of loan type to all loans	31.60%		36.70%
Allowance for credit losses on loans	$ 35,108,000	38,613,000	$ 45,186,000	46,816,000	46,356,000	47,771,000
Consumer loans | Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 123,351,000		$ 102,263,000
Ratio of loan type to all loans	0.80%		0.70%
Allowance for credit losses on loans	$ 3,292,000	2,958,000	$ 2,729,000	2,578,000	2,567,000	2,635,000
Consumer loans | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 144,528,000		$ 139,703,000
Ratio of loan type to all loans	0.90%		1.00%
Allowance for credit losses on loans	$ 2,226,000	2,362,000	$ 2,571,000	2,246,000	2,034,000	2,048,000
Consumer loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 103,145,000		$ 83,159,000
Ratio of loan type to all loans	0.70%		0.60%
Allowance for credit losses on loans	$ 3,335,000	$ 3,455,000	$ 2,991,000	$ 3,582,000	$ 4,045,000	$ 4,615,000

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