Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	$ 7,368	[1]	$ 0	$ 0
Allowance for loan and lease losses	233,394		319,018	270,144	227,765
Noncommerical
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	7,368
Noncommerical | Non-specific
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	(15,772)
Originated Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	7,368	[1]
Unpaid principal balance	145,485		221,508
ALLL for loans and leases individually evaluated for impairment	10,161		18,355
Financing Receivable, Individually Evaluated for Impairment	132,146		202,253
Average balance	151,330		158,426	119,228
Interest income recognized	7,817		6,735	2,341
Originated Loans | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	5,141	[1]
Unpaid principal balance	7,306		32,898
ALLL for loans and leases individually evaluated for impairment	103		2,469
Financing Receivable, Individually Evaluated for Impairment	2,272		17,075
Average balance	6,414		22,493	26,612
Interest income recognized	270		399	56
Originated Loans | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	27,421	[1]
Unpaid principal balance	103,522		136,743
ALLL for loans and leases individually evaluated for impairment	6,873		11,697
Financing Receivable, Individually Evaluated for Impairment	97,111		133,804
Average balance	105,628		96,082	65,729
Interest income recognized	5,702		4,630	1,330
Originated Loans | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	(815)	[1]
Unpaid principal balance	2,279		3,475
ALLL for loans and leases individually evaluated for impairment	209		298
Financing Receivable, Individually Evaluated for Impairment	1,878		3,375
Average balance	2,658		2,690	1,368
Interest income recognized	144		142	55
Originated Loans | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	7,551	[1]
Unpaid principal balance	10,393		22,619
ALLL for loans and leases individually evaluated for impairment	771		2,133
Financing Receivable, Individually Evaluated for Impairment	9,300		22,619
Average balance	12,772		13,658	12,984
Interest income recognized	642		788	456
Originated Loans | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	(253)	[1]
Unpaid principal balance	188		804
ALLL for loans and leases individually evaluated for impairment	54		202
Financing Receivable, Individually Evaluated for Impairment	188		804
Average balance	350		497	587
Interest income recognized	22		37	21
Originated Loans | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	(1,288)	[1]
Unpaid principal balance			707
ALLL for loans and leases individually evaluated for impairment	0		53
Financing Receivable, Individually Evaluated for Impairment	0		707
Average balance	0		424	38
Interest income recognized	0		23	0
Originated Loans | Noncommerical | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	5,717	[1]
Unpaid principal balance	15,939		16,229
ALLL for loans and leases individually evaluated for impairment	1,586		959
Financing Receivable, Individually Evaluated for Impairment	15,539		15,836
Average balance	15,470		14,951	9,252
Interest income recognized	444		586	300
Originated Loans | Noncommerical | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	(478)	[1]
Unpaid principal balance	1,108		1,321
ALLL for loans and leases individually evaluated for impairment	72		287
Financing Receivable, Individually Evaluated for Impairment	1,108		1,321
Average balance	958		2,850	2,022
Interest income recognized	55		41	105
Originated Loans | Noncommerical | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	(9,838)	[1]
Unpaid principal balance	3,596		4,203
ALLL for loans and leases individually evaluated for impairment	372		1
Financing Receivable, Individually Evaluated for Impairment	3,596		4,203
Average balance	5,653		2,931	0
Interest income recognized	485		68	0
Originated Loans | Noncommerical | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	(10,018)	[1]
Unpaid principal balance	1,154		2,509
ALLL for loans and leases individually evaluated for impairment	121		256
Financing Receivable, Individually Evaluated for Impairment	1,154		2,509
Average balance	1,427		1,850	636
Interest income recognized	53		21	18
Originated Loans | Noncommerical | Non-specific
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	(15,772)	[1]
Unpaid principal balance			0
ALLL for loans and leases individually evaluated for impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	0		0
Originated Loans | With A Recorded Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total impaired noncovered loans and leases	83,678		68,463
Originated Loans | With A Recorded Allowance | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	1,025		5,941
Originated Loans | With A Recorded Allowance | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	57,819		39,648
Originated Loans | With A Recorded Allowance | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	783		1,425
Originated Loans | With A Recorded Allowance | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	7,197		7,429
Originated Loans | With A Recorded Allowance | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	133		665
Originated Loans | With A Recorded Allowance | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses			0
Originated Loans | With A Recorded Allowance | Noncommerical | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	11,534		9,346
Originated Loans | With A Recorded Allowance | Noncommerical | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	651		1,162
Originated Loans | With A Recorded Allowance | Noncommerical | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	3,382		1,238
Originated Loans | With A Recorded Allowance | Noncommerical | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	1,154		1,609
Originated Loans | With A Recorded Allowance | Noncommerical | Non-specific
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses			0
Originated Loans | With No Recorded Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	48,468		133,790
Originated Loans | With No Recorded Allowance | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	1,247		11,134
Originated Loans | With No Recorded Allowance | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	39,292		94,156
Originated Loans | With No Recorded Allowance | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	1,095		1,950
Originated Loans | With No Recorded Allowance | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	2,103		15,190
Originated Loans | With No Recorded Allowance | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	55		139
Originated Loans | With No Recorded Allowance | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses			707
Originated Loans | With No Recorded Allowance | Noncommerical | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	4,005		6,490
Originated Loans | With No Recorded Allowance | Noncommerical | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	457		159
Originated Loans | With No Recorded Allowance | Noncommerical | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	214		2,965
Originated Loans | With No Recorded Allowance | Noncommerical | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	0		900
Originated Loans | With No Recorded Allowance | Noncommerical | Non-specific
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses			0
Acquired Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassification	0	[1]
Acquired loans which have adverse change in expected cash flows	$ 459,947

[1] Reclassification results from enhancements to the ALLL calculation during the second quarter of 2013 that resulted in the allocation of $15.8 million previously designated as 'nonspecific' to other loan classes and the absorption of $7.4 million of the reserve for unfunded commitments related to unfunded, revocable loan commitments into the ALLL. Further discussion is contained in Note A.