Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 63,720	$ 56,405
Investing Activities
Proceeds from maturities, repayments, and calls of securities available-for-sale	148,842	82,779
Proceeds from sales of securities available-for-sale	47,320	12,838
Purchases of securities available-for-sale	(159,252)	(11,115)
Proceeds from maturities, repayments, and calls of securities held-to-maturity	3,447	3,151
Purchases of securities held-to-maturity	(1,184)	(1,030)
Net purchases of FHLB stock	(1,190)	(427)
Net increase in loans	(129,297)	(251,586)
Premiums paid for BOLI, net of claims	1,021	(72)
Proceeds from sales of OREO	10,584	9,160
Proceeds from sales of premises, furniture, and equipment	195	158
Purchases of premises, furniture, and equipment	(4,386)	(4,074)
Net cash used in investing activities	(83,900)	(160,218)
Financing Activities
Net increase in deposit accounts	324,913	129,149
Net increase (decrease) in borrowed funds	51,042	(5,591)
Payment for the Termination of FHLB Advances	0	(116,609)
Cash dividends paid	(13,232)	(10,530)
Restricted stock activity	(2,766)	(2,699)
Excess tax benefit related to share-based compensation	794	825
Net cash provided by (used in) financing activities	360,751	(5,455)
Net increase (decrease) in cash and cash equivalents	340,571	(109,268)
Cash and cash equivalents at beginning of period	606,262	587,241
Cash and cash equivalents at end of period	946,833	477,973
Supplemental Disclosures of Cash Flow Information:
Income taxes paid	7,953	4,734
Interest paid to depositors and creditors	11,476	11,927
Dividends declared, but unpaid	7,023	6,027
Non-cash transfers of loans to OREO	4,657	9,339
Non-cash transfer of loans held-for-investment to loans held-for-sale	$ 14,948	$ 64,881