CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - $ / shares	Sep. 30, 2018	Sep. 30, 2017
STOCKHOLDERS’ EQUITY
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	90,000,000	45,000,000
Common stock, shares issued (in shares)	39,192,063	28,871,621
Common stock, shares outstanding (in shares)	39,167,280	28,867,785
Treasury stock (in shares)	24,783	3,836
Nonvoting Common Stock [Member]
STOCKHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0