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Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	$ 166,955	$ 131,534
Charge-offs	(425)	(5,755)
Recoveries	6,770	9,026
Provision & Transfers	(2,000)	14,400
Ending allowance	171,300	166,955
Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	166,955
Ending allowance		166,955
Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		17,750
Commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	109,923	93,470
Charge-offs	(33)	(4,318)
Recoveries	3,503	5,646
Provision & Transfers	11,982	19,260
Ending allowance	125,375	109,923
Commercial loans | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	109,923
Ending allowance		109,923
Commercial loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		(4,135)
Commercial loans | Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	13,853	7,391
Charge-offs	0	0
Recoveries	0	498
Provision & Transfers	3,096	2,951
Ending allowance	16,949	13,853
Commercial loans | Multi-family | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	13,853
Ending allowance		13,853
Commercial loans | Multi-family | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		3,013
Commercial loans | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	22,516	13,170
Charge-offs	0	(111)
Recoveries	2,789	2,447
Provision & Transfers	(1,868)	7,156
Ending allowance	23,437	22,516
Commercial loans | Commercial real estate | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	22,516
Ending allowance		22,516
Commercial loans | Commercial real estate | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		(146)
Commercial loans | Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	38,665	31,450
Charge-offs	(31)	(4,196)
Recoveries	92	443
Provision & Transfers	7,231	10,183
Ending allowance	45,957	38,665
Commercial loans | Commercial & industrial | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	38,665
Ending allowance		38,665
Commercial loans | Commercial & industrial | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		785
Commercial loans | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	24,156	32,304
Charge-offs	0	0
Recoveries	0	188
Provision & Transfers	1,429	1,200
Ending allowance	25,585	24,156
Commercial loans | Construction | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	24,156
Ending allowance		24,156
Commercial loans | Construction | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		(9,536)
Commercial loans | Land - acquisition & development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	10,733	9,155
Charge-offs	(2)	(11)
Recoveries	622	2,070
Provision & Transfers	2,094	(2,230)
Ending allowance	13,447	10,733
Commercial loans | Land - acquisition & development | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	10,733
Ending allowance		10,733
Commercial loans | Land - acquisition & development | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		1,749
Consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	57,032	38,064
Charge-offs	(392)	(1,437)
Recoveries	3,267	3,380
Provision & Transfers	(13,982)	(4,860)
Ending allowance	45,925	57,032
Consumer loans | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	57,032
Ending allowance		57,032
Consumer loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		21,885
Consumer loans | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	3,555	1,369
Charge-offs	0	0
Recoveries	0	0
Provision & Transfers	1,352	675
Ending allowance	4,907	3,555
Consumer loans | Construction | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	3,555
Ending allowance		3,555
Consumer loans | Construction | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		1,511
Consumer loans | Single-family residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	45,186	30,988
Charge-offs	(106)	(131)
Recoveries	2,026	1,394
Provision & Transfers	(16,128)	(3,848)
Ending allowance	30,978	45,186
Consumer loans | Single-family residential | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	45,186
Ending allowance		45,186
Consumer loans | Single-family residential | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		16,783
Consumer loans | Land - consumer lot loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	2,729	2,143
Charge-offs	0	(237)
Recoveries	168	639
Provision & Transfers	2,042	(308)
Ending allowance	4,939	2,729
Consumer loans | Land - consumer lot loans | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	2,729
Ending allowance		2,729
Consumer loans | Land - consumer lot loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		492
Consumer loans | HELOC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	2,571	1,103
Charge-offs	0	0
Recoveries	52	95
Provision & Transfers	(233)	428
Ending allowance	2,390	2,571
Consumer loans | HELOC | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	2,571
Ending allowance		2,571
Consumer loans | HELOC | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		945
Consumer loans | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	2,991	2,461
Charge-offs	(286)	(1,069)
Recoveries	1,021	1,252
Provision & Transfers	(1,015)	(1,807)
Ending allowance	2,711	2,991
Consumer loans | Consumer | Adjusted
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance	$ 2,991
Ending allowance		2,991
Consumer loans | Consumer | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance		$ 2,154

X

- Definition

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

+ References

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-Publisher FASB
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Amount of increase in allowance for credit loss on financing receivable from recovery.

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