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Income Taxes - Net Deferred Tax Asset (Liability) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Deferred tax assets
Allowance for credit losses	$ 47,426	$ 45,724
REO reserves	329	173
Non-accrual loan interest	1,104	1,080
Deferred compensation	6,841	6,230
Stock based compensation	2,636	2,508
Lease liability	6,207	6,655
Other	1,329	4,525
Total deferred tax assets	65,872	66,895
Deferred tax liabilities
FHLB stock dividends	9,826	9,783
Valuation adjustment on available-for-sale securities and cash flow hedges	15,765	20,845
Loan origination fees and costs	10,918	5,645
Premises and equipment	20,132	21,426
Lease right-of-use assets	5,992	6,249
Equity investments	5,323	2,982
Other	4,141	6,157
Total deferred tax liabilities	72,097	73,087
Net deferred tax asset (liability)	(6,225)	(6,192)
Current tax asset (liability)	2,920	10,069
Net tax asset (liability)	$ (3,305)	$ 3,877

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