Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 46,261	$ 71,834
Adjustments to reconcile net income to net cash provided by operating activities:
FHLB stock dividends	(4,747)	(5,667)
Provision for credit losses	22,300	450
Amortization and accretion of premiums and discounts on securities	999	959
Depreciation and amortization of premises and equipment	6,812	6,907
Amortization of intangible assets	1,493	1,766
Amortization of deferred amounts related to FHLB advances, net	315	6
Common stock committed to be released for allocation - ESOP	1,586	1,638
Stock-based compensation	450	352
Changes in:
Unrestricted cash collateral (provided to)/received from derivative counterparties, net	0	(9,970)
Other assets, net	5,049	2,962
Income taxes payable/receivable, net	(1,649)	1,679
Deferred income tax liabilities, net	(2,507)	(699)
Accounts payable and accrued expenses	(7,225)	(16,691)
Net cash provided by operating activities	69,137	55,526
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of AFS securities	(465,764)	(286,488)
Proceeds from calls, maturities and principal reductions of AFS securities	469,995	246,648
Proceeds from calls, maturities and principal reductions of held-to-maturity ("HTM") securities	0	126,684
Proceeds from the redemption of FHLB stock	421	102,554
Purchase of FHLB stock	0	(97,270)
Net change in loans receivable	6,120	5,533
Purchase of premises and equipment	(9,422)	(8,846)
Proceeds from sale of other real estate owned ("OREO")	993	1,624
Proceeds from bank-owned life insurance ("BOLI") death benefit	490	0
Net cash provided by investing activities	2,833	90,439
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash dividends paid	(82,130)	(123,216)
Net change in deposits	487,817	(22,483)
Proceeds from borrowings	1,325,600	3,043,700
Repayments on borrowings	(1,572,600)	(3,088,752)
Change in advance payments by borrowers for taxes and insurance	(26,561)	(25,495)
Payment of FHLB prepayment penalties	(4,215)	0
Stock options exercised	638	1,347
Net cash provided by (used in) financing activities	128,549	(214,899)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS	200,519	(68,934)
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS:
Beginning of period	253,700	139,055
End of period	454,219	70,121
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Operating lease right-of-use assets obtained	16,841	0
Operating lease liabilities obtained	$ 16,726	$ 0