Parent Company Financial Information (Condensed Statements of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities
Net Income (Loss)	$ 60,016	$ 46,143	$ 48,037
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	2,844	1,622	1,635
Net cash provided by operating activities	79,636	134,899	86,424
Net cash acquired in business combinations	(154,170)	0	247,792
Investing Activities
Proceeds from termination of trust subsidiaries	0	0	774
Net cash provided by investing activities	(281,060)	8,403	(23,270)
Financing Activities
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(32)	0	0
Cash dividends paid	(19,858)	(38,824)	(10,660)
Repayment of long-term subordinated debt	(51,000)	0	(25,774)
Purchase and retirement of common stock	(429)	0	(32)
Proceeds from exercise of stock options	1,092	713	848
Excess tax benefit from stock-based compensation	1,203	0	98
Net cash provided by financing activities	(132,941)	76,335	(282,995)
Increase (decrease) in cash and cash equivalents	(334,365)	219,637	(219,841)
Cash and cash equivalents at beginning of period	513,926	294,289	514,130
Cash and cash equivalents at end of period	179,561	513,926	294,289
Parent [Member]
Operating Activities
Net Income (Loss)	60,016	46,143	48,037
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	119,533	2,020	(49,180)
Stock-based compensation expense	2,844	1,622	1,635
Net changes in other assets and liabilities	6,830	(264)	315
Net cash provided by operating activities	189,223	49,521	807
Net cash acquired in business combinations	(53,159)	0	0
Investing Activities
Proceeds from termination of trust subsidiaries	0	0	774
Net cash provided by investing activities	(53,159)	0	774
Financing Activities
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(32)	0	0
Cash dividends paid	(19,858)	(38,824)	(10,660)
Repayment of long-term subordinated debt	(51,000)	0	(25,774)
Purchase and retirement of common stock	(429)	0	(32)
Proceeds from exercise of stock options	1,092	713	848
Downstream stock offering proceeds to the Bank	(100,000)	0	(50,000)
Excess tax benefit from stock-based compensation	1,203	0	98
Net cash provided by financing activities	(169,024)	(38,111)	(85,520)
Increase (decrease) in cash and cash equivalents	(32,960)	11,410	(83,939)
Cash and cash equivalents at beginning of period	86,644	75,234	159,173
Cash and cash equivalents at end of period	$ 53,684	$ 86,644	$ 75,234