Condensed Financial Information-Parent Only (Schedule Of Condensed Cash Flow Statement) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities
Net income	$ 25,110	$ 16,624	$ 8,918
(Increase) decrease in other assets	(4,687)	(9,272)	1,125
Increase (decrease) in other liabilities	15,307	7,759	1,318
Stock-based compensation expense	3,157	2,595	1,800
Net cash provided by operating activities	49,030	33,042	37,640
Investing activities
Net cash used in investing activities	(745,930)	(472,372)	(355,668)
Financing activities
Proceeds from issuance of common stock	1,629	41,713	54,501
Proceeds from the exercise of common stock options	1,653	454
Purchase of treasury stock			(866)
Net cash provided by financing activities	966,743	658,248	594,883
Net increase in cash and cash equivalents	269,850	218,918	276,855
Cash and cash equivalents, beginning of year	968,092	749,174	472,319
Cash and cash equivalents, end of year	1,237,942	968,092	749,174
Parent Company [Member]
Operating activities
Net income	25,110	16,624	8,918
(Increase) decrease in other assets	(1,735)	(1,749)	1,407
Increase (decrease) in other liabilities	(73)	53	8
Stock-based compensation expense	3,157	2,595	1,800
Equity in undistributed income	(26,593)	(17,436)	(9,824)
Net cash provided by operating activities	(134)	87	2,309
Investing activities
Purchase of equity security			(3,000)
Contribution to subsidiary	(16,798)	(31,283)
Net cash used in investing activities	(16,798)	(31,283)	(3,000)
Financing activities
Proceeds from issuance of common stock	1,629	41,713	54,501
Proceeds from the exercise of common stock options	1,653	454
Purchase of treasury stock			(866)
Net cash provided by financing activities	3,282	42,167	53,635
Net increase in cash and cash equivalents	(13,650)	10,971	52,944
Cash and cash equivalents, beginning of year	84,262	73,291	20,347
Cash and cash equivalents, end of year	$ 70,612	$ 84,262	$ 73,291