Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Statement of Stockholders' Equity [Abstract]
Stock option exercises (shares)	384,775	662,224
Common stock issued in acquisition of WNB Bancshares (shares)	2,000,000	0
Issuance of preferred stock (shares)	0	6,000,000
Purchase of treasury stock (shares)	0	1,905,077
Cash dividends declared on preferred stock, per share	$ 0.67	$ 0.45
Cash dividends declared on common stock, per share	$ 1.01	$ 0.98