Loans And Allowance For Credit Losses (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2013 Y D Payments M Billing_Cycles	Dec. 31, 2012	Dec. 31, 2011
Loans And Allowance For Credit Losses [Line Items]
ALLL Reclassification of Commercial to Commercial Real Estate Loans				$ 83,200,000
Loans Receivable Commercial Construction and Land Development			561,258,000	787,556,000
Impaired Financing Receivable, Recorded Investment			924,553,000	1,325,838,000
Loans Pledged as Collateral			23,000,000,000	21,100,000,000
Unearned income and fees, net of related costs			141,700,000	137,500,000
Owner occupied and commercial real estate loans, unamortized premiums			47,200,000	59,300,000
Principle amount of loans held for sale sold			1,600,000,000	1,700,000,000	1,600,000,000
Additions to Loans Held For Sale			1,500,000,000	1,700,000,000	1,600,000,000
Income from loans sold, excluding servicing			24,100,000	30,700,000	17,500,000
Number of days for consumer loans to be charged off			180
Number of days for closed-end loans to be charged off			120
Provision for Unfunded Lending Commitments	18,400,000
Decrease in classified loan commitments	137,000,000
Look back period for commercial and CRE		60
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
Maximum loan amount for internally assigned loan grades			750,000
Threshold for nonaccrual loans for evaluation of impairment			1,000,000
Minimum number of months for borrower to meet terms For TDR status			6
Unused commitments to extend credit on TDR loans			6,000,000	13,000,000
Recorded investment in TDR loans modified with interest rates below market			172,600,000	225,600,000
Loans modified as troubled debt restructuring loans			155,800,000	174,000,000
Net carrying amount of certain PCI loans				12,200,000
Increase (decrease) on gross provision for loan losses			(10,100,000)	(16,500,000)	(1,700,000)
Charge-offs (recoveries), net before FDIC indemnification			(4,800,000)	8,600,000	(7,100,000)
Total reversal amount to ALLL			15,100,000	20,400,000	16,100,000
Additional interest income due to increased cash flows from acquired loans			90,900,000	58,500,000	78,400,000
Additional noninterest expense due to increased cash flows from acquired loans			75,000,000	46,200,000	56,600,000
Loss sharing reimbursement, minimum			80.00%
Loss sharing reimbursement, maximum			95.00%
Maximum Number of Years For FDIC Coverage For All Except Single Family Residential Loans			5
Maximum Number Of Years For FDIC Coverage For Single Family Residential Loans			10
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment			138,945,000	185,695,000
Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment			295,729,000	332,510,000
Subsequent payment default period, number of days			90
Consumer [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment			99,977,000	112,057,000
Subsequent payment default period, number of days			60
Impaired Financing Receivable Recorded Investment With No Allowance [Member] [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment				574,793,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment				79,413,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment				106,448,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] [Member] | Consumer [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment				$ 55,199,000