CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INTEREST INCOME
Loans receivable	$ 131,541,000	$ 117,457,000	$ 382,581,000	$ 348,326,000
Mortgage-backed securities	18,022,000	15,992,000	52,588,000	45,007,000
Investment securities and cash equivalents	5,509,000	4,267,000	14,762,000	13,345,000
Interest income	155,072,000	137,716,000	449,931,000	406,678,000
INTEREST EXPENSE
Customer accounts	18,887,000	12,764,000	49,939,000	38,173,000
FHLB advances	16,333,000	16,337,000	47,104,000	49,011,000
Interest expense	35,220,000	29,101,000	97,043,000	87,184,000
Net interest income	119,852,000	108,615,000	352,888,000	319,494,000
Provision (release) for loan losses	1,000,000	0	50,000	(1,600,000)
Net interest income after provision (release) for loan losses	118,852,000	108,615,000	352,838,000	321,094,000
OTHER INCOME
Gain on sale of investment securities	0	0	0	968,000
FDIC loss share valuation adjustments	0	0	(8,550,000)	0
Loan fee income	1,094,000	889,000	2,909,000	3,310,000
Deposit fee income	6,411,000	5,714,000	19,500,000	15,803,000
Other income	4,946,000	7,319,000	17,974,000	15,873,000
Other income, total	12,451,000	13,922,000	31,833,000	35,954,000
OTHER EXPENSE
Compensation and benefits	31,223,000	28,947,000	92,467,000	84,774,000
Occupancy	9,095,000	8,829,000	26,779,000	26,370,000
FDIC insurance premiums	2,950,000	2,842,000	8,622,000	8,591,000
Product delivery	4,356,000	3,246,000	11,977,000	10,096,000
Information technology	10,118,000	6,617,000	26,828,000	19,754,000
Other expense	9,235,000	6,581,000	28,032,000	19,285,000
Other expense, total	66,977,000	57,062,000	194,705,000	168,870,000
Gain (loss) on real estate owned, net	168,000	(124,000)	(64,000)	1,069,000
Income before income taxes	64,494,000	65,351,000	189,902,000	189,247,000
Income tax expense	13,100,000	21,239,000	37,567,000	61,819,000
NET INCOME	$ 51,394,000	$ 44,112,000	$ 152,335,000	$ 127,428,000
PER SHARE DATA
Basic earnings per share (in dollars per share)	$ 0.61	$ 0.49	$ 1.78	$ 1.43
Diluted earnings per share (in dollars per share)	0.61	0.49	1.78	1.42
Dividends paid on common stock per share (in dollars per share)	$ 0.17	$ 0.15	$ 0.49	$ 0.69
Basic weighted average number of shares outstanding (in shares)	84,168,992	89,199,823	85,589,588	89,297,471
Diluted weighted average number of shares outstanding (in shares)	84,252,659	89,497,264	85,698,888	89,653,955