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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Statement of Financial Position [Abstract]    
Allowance for loan losses $ 127,155 $ 123,073
Goodwill $ 300,288 $ 293,153
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common stock, shares issued (in shares) 135,274,618 134,957,511
Common stock, shares outstanding (in shares) 86,363,099 87,193,362
Treasury stock, shares (in shares) 48,911,519 47,764,149