Condensed Consolidated Statements of Changes In Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified		Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE, VALUE at Dec. 31, 2012		$ 1,724,039	$ 1,512,400	$ 187,293	$ 24,346
BALANCE, SHARES at Dec. 31, 2012			111,889,959
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		98,361		98,361
Other comprehensive income, net of tax		(29,322)			(29,322)
Comprehensive income		69,039
Stock-based compensation		5,017	5,017
Stock repurchased and retired, shares			(584,677)
Stock repurchased and retired, value		(9,360)	(9,360)
Issuances of common stock under stock plans and related tax benefit, shares			667,921
Issuances of common stock under stock plans and related tax benefit, value		6,428	6,428
Cash dividends on common stock		(67,737)		(67,737)
BALANCE, VALUE at Dec. 31, 2013		1,727,426	1,514,485	217,917	(4,976)
BALANCE, SHARES at Dec. 31, 2013		111,973,203	111,973,203
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		35,985		35,985
Other comprehensive income, net of tax		17,420			17,420
Comprehensive income		53,405
Stock issued in connection with merger, shares	[1]		104,385,087
Stock issued in connection with merger, value	[1]	1,989,030	1,989,030
Stock-based compensation		8,682	8,682
Stock repurchased and retired, shares			(371,236)
Stock repurchased and retired, value		(6,617)	(6,617)
Issuances of common stock under stock plans and related tax benefit, shares			1,203,667
Issuances of common stock under stock plans and related tax benefit, value		6,927	6,927
Cash dividends on common stock		(49,793)		(49,793)
BALANCE, VALUE at Jun. 30, 2014		$ 3,729,060	$ 3,512,507	$ 204,109	$ 12,444
BALANCE, SHARES at Jun. 30, 2014		217,190,721	217,190,721

[1] The amount of common stock issued in connection with the merger is net of $784,000 of issuance costs.