Business Combinations (Narrative) (Details)	Sep. 30, 2015 $ / shares	Aug. 04, 2015 Right / shares $ / shares	Dec. 31, 2014 $ / shares
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00	$ 1.00
Number of rights to receive acquirer shares, per one outstanding share | Right / shares		2.373
F.N.B. Corporation [Member]
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)		$ 0.01