Loans And Allowance For Credit Losses (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 D Billing_Cycles Payments M	Jun. 30, 2013	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Loans And Allowance For Credit Losses [Line Items]
Threshold for Internal risk grades assigned to commercial and commercial real estate loans	$ 750,000		$ 750,000
Unused Commitments to Extend Credit	6,600,000		6,600,000				5,600,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	(200,000)	(2,500,000)	(2,500,000)	(7,100,000)
Document Fiscal Year Focus			2014
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	837,000	5,552,000	1,054,000	6,659,000	141,300,000	183,800,000
Unearned income and fees, net of related costs	149,600,000		149,600,000				141,700,000
Owner occupied and commercial real estate loans, unamortized premiums	41,600,000		41,600,000				47,200,000
Land Development Loans	540,100,000		540,100,000				561,300,000
Loans at carrying value pledged as collateral for current and potential borrowings	23,400,000,000		23,400,000,000				23,000,000,000
Payments for Origination and Purchases of Loans Held-for-sale	301,600,000	418,900,000	597,100,000	777,800,000
Loans and Leases Receivable, Gain (Loss) on Sales, Net	3,600,000	8,000,000	7,100,000	16,500,000
Principle amount of loans held for sale sold	260,100,000	446,700,000	597,700,000	894,300,000
Servicing Asset at Amortized Cost	0		0				0
Number of days for consumer loans to be charged off			180
Number of days for closed-end loans to be charged off			120
Minimum number of days past due for nonaccrual status			90
Minimum number of monthly payments in arrears when reporting past due			2
Minimum number of billing cycles in arrears when reported as past due			2
Minimum number of days unpaid when reported as past due			30
Threshold for nonaccrual loans for evaluation of impairment			1,000,000
Minimum number of months for borrower to meet terms For TDR status			6
Recorded investment in TDR loans modified with interest rates below market	182,600,000		182,600,000				172,600,000
Charge-offs (recoveries), net before FDIC indemnification	500,000	300,000	(1,700,000)	(600,000)
Total reversal amount to ALLL	700,000	1,100,000	3,600,000	10,900,000
Additional interest income due to increased cash flows from acquired loans	11,700,000	28,400,000	30,200,000	47,400,000
Additional noninterest expense due to increased cash flows from acquired loans	9,300,000	21,800,000	25,300,000	42,100,000
Loss sharing reimbursement, minimum	80.00%		80.00%
Loss sharing reimbursement, maximum	95.00%		95.00%
FDIC Indemnification Asset	$ 5,800,000		$ 5,800,000				$ 26,400,000
Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Subsequent payment default period, number of days			90
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Subsequent payment default period, number of days			60