Allowance for Loan and Lease Losses (Note Restructurings During Period) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012 loans	Jun. 30, 2012 loans	Jun. 30, 2012 loans
Financing Receivable, Modifications [Line Items]
Value of restructured loans	$ 308,038	$ 308,038	$ 308,038
Minimum amount of nonaccrual status for loans to qualify to be individually evaluated for impairment	500,000	500,000	500,000
Noncovered Loans
Financing Receivable, Modifications [Line Items]
Value of restructured loans	149,411	149,411	149,411
Noncovered Loans | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	51	97	176
Recorded investment at period end	14,446	37,749	75,910
Noncovered Loans | Interest Only Loan | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	7	12	20
Recorded investment at period end	3,424	4,398	6,861
Noncovered Loans | Interest Only Loan | Construction and Land Development - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	2	2	3
Recorded investment at period end	316	316	510
Noncovered Loans | Interest Only Loan | Commercial Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	5	9	10
Recorded investment at period end	3,108	3,741	4,096
Noncovered Loans | Interest Only Loan | Other Commercial Real Estate | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	265
Noncovered Loans | Interest Only Loan | Commercial and Industrial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	3
Recorded investment at period end	0	0	1,119
Noncovered Loans | Interest Only Loan | Residential Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	2
Recorded investment at period end	0	341	395
Noncovered Loans | Interest Only Loan | Construction and Land Development - Non - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	476
Noncovered Loans | Loan Term Extension | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	29	62	112
Recorded investment at period end	6,803	25,617	43,758
Noncovered Loans | Loan Term Extension | Construction and Land Development - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	2	5
Recorded investment at period end	253	7,514	9,592
Noncovered Loans | Loan Term Extension | Commercial Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	17	35	60
Recorded investment at period end	4,873	12,404	24,299
Noncovered Loans | Loan Term Extension | Other Commercial Real Estate | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	2	3	4
Recorded investment at period end	963	1,345	1,396
Noncovered Loans | Loan Term Extension | Commercial and Industrial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	3	8	20
Recorded investment at period end	320	886	3,062
Noncovered Loans | Loan Term Extension | Finance Leases Financing Receivable | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	3	4
Recorded investment at period end	0	178	182
Noncovered Loans | Loan Term Extension | Residential Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	2	5	12
Recorded investment at period end	153	447	1,990
Noncovered Loans | Loan Term Extension | Construction and Land Development - Non - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	2
Recorded investment at period end	0	1,701	2,095
Noncovered Loans | Loan Term Extension | Consumer | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	4	5	5
Recorded investment at period end	241	1,142	1,142
Noncovered Loans | Below Market Interest Rate | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	13	20	41
Recorded investment at period end	3,057	6,404	23,961
Noncovered Loans | Below Market Interest Rate | Construction and Land Development - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	3
Recorded investment at period end	0	230	5,426
Noncovered Loans | Below Market Interest Rate | Commercial Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	3	15
Recorded investment at period end	1,453	3,376	15,086
Noncovered Loans | Below Market Interest Rate | Other Commercial Real Estate | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Noncovered Loans | Below Market Interest Rate | Commercial and Industrial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	3	4	6
Recorded investment at period end	116	879	979
Noncovered Loans | Below Market Interest Rate | Residential Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	7	9	12
Recorded investment at period end	1,429	1,858	2,405
Noncovered Loans | Below Market Interest Rate | Revolving Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	1	1
Recorded investment at period end	49	49	49
Noncovered Loans | Below Market Interest Rate | Consumer | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	2	4
Recorded investment at period end	10	12	16
Noncovered Loans | Other Concession | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	2	3	3
Recorded investment at period end	1,162	1,330	1,330
Noncovered Loans | Other Concession | Commercial Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	2	2
Recorded investment at period end	775	943	943
Noncovered Loans | Other Concession | Commercial and Industrial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	1	1
Recorded investment at period end	387	387	387
Covered Loans
Financing Receivable, Modifications [Line Items]
Value of restructured loans	158,627	158,627	158,627
Covered Loans | Construction and Land Development - Non - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	23	48	109
Recorded investment at period end	19,301	31,267	72,303
Covered Loans | Construction and Land Development - Non - Commercial | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	2	10	31
Recorded investment at period end	1,336	4,676	25,667
Covered Loans | Interest Only Loan | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	3	4	6
Recorded investment at period end	9,823	9,958	14,579
Covered Loans | Interest Only Loan | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	4,507
Covered Loans | Interest Only Loan | Construction and Land Development - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	2
Recorded investment at period end	0	135	249
Covered Loans | Interest Only Loan | Construction and Land Development - Commercial | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Covered Loans | Interest Only Loan | Commercial Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	1	1
Recorded investment at period end	8,752	8,752	8,752
Covered Loans | Interest Only Loan | Commercial Mortgage | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Covered Loans | Interest Only Loan | Commercial and Industrial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	1	1
Recorded investment at period end	971	971	971
Covered Loans | Interest Only Loan | Commercial and Industrial | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Covered Loans | Interest Only Loan | Residential Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	1	2
Recorded investment at period end	100	100	4,607
Covered Loans | Interest Only Loan | Residential Mortgage | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	4,507
Covered Loans | Loan Term Extension | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	9	13	31
Recorded investment at period end	3,731	6,630	14,276
Covered Loans | Loan Term Extension | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	9
Recorded investment at period end	0	2,219	4,739
Covered Loans | Loan Term Extension | Construction and Land Development - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	7	9	16
Recorded investment at period end	2,468	4,850	8,045
Covered Loans | Loan Term Extension | Construction and Land Development - Commercial | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	4
Recorded investment at period end	0	2,219	3,721
Covered Loans | Loan Term Extension | Commercial Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	2	5
Recorded investment at period end	1,240	1,705	3,169
Covered Loans | Loan Term Extension | Commercial Mortgage | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Covered Loans | Loan Term Extension | Other Commercial Real Estate | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	1,858
Covered Loans | Loan Term Extension | Other Commercial Real Estate | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Covered Loans | Loan Term Extension | Commercial and Industrial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	1	4
Recorded investment at period end	23	23	245
Covered Loans | Loan Term Extension | Commercial and Industrial | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	110
Covered Loans | Loan Term Extension | Residential Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	5
Recorded investment at period end	0	52	959
Covered Loans | Loan Term Extension | Residential Mortgage | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	4
Recorded investment at period end	0	0	908
Covered Loans | Below Market Interest Rate | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	11	31	72
Recorded investment at period end	5,747	14,679	43,448
Covered Loans | Below Market Interest Rate | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	2	9	21
Recorded investment at period end	1,336	2,457	16,421
Covered Loans | Below Market Interest Rate | Construction and Land Development - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	8	22
Recorded investment at period end	74	665	7,363
Covered Loans | Below Market Interest Rate | Construction and Land Development - Commercial | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	6
Recorded investment at period end	0	160	5,684
Covered Loans | Below Market Interest Rate | Commercial Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	4	9	21
Recorded investment at period end	2,832	10,240	25,953
Covered Loans | Below Market Interest Rate | Commercial Mortgage | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	2	4	8
Recorded investment at period end	1,336	1,777	7,029
Covered Loans | Below Market Interest Rate | Other Commercial Real Estate | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	2	2	2
Recorded investment at period end	1,720	1,720	1,720
Covered Loans | Below Market Interest Rate | Other Commercial Real Estate | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Covered Loans | Below Market Interest Rate | Commercial and Industrial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	1	3	7
Recorded investment at period end	502	644	853
Covered Loans | Below Market Interest Rate | Commercial and Industrial | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	2	2
Recorded investment at period end	0	142	142
Covered Loans | Below Market Interest Rate | Residential Mortgage | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	3	8	18
Recorded investment at period end	619	1,134	5,684
Covered Loans | Below Market Interest Rate | Residential Mortgage | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	3
Recorded investment at period end	0	102	1,691
Covered Loans | Below Market Interest Rate | Construction and Land Development - Non - Commercial | All Restructuring
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	2
Recorded investment at period end	0	276	1,875
Covered Loans | Below Market Interest Rate | Construction and Land Development - Non - Commercial | Restructuring With Payment Default
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	2
Recorded investment at period end	0	276	1,875
Restructuring With Payment Default | Noncovered Loans
Financing Receivable, Modifications [Line Items]
Number of loans	4	11	27
Recorded investment at period end	1,183	3,015	9,843
Restructuring With Payment Default | Noncovered Loans | Interest Only Loan
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	2
Recorded investment at period end	0	109	374
Restructuring With Payment Default | Noncovered Loans | Interest Only Loan | Construction and Land Development - Commercial
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Interest Only Loan | Commercial Mortgage
Financing Receivable, Modifications [Line Items]
Number of loans	0	1	1
Recorded investment at period end	0	109	109
Restructuring With Payment Default | Noncovered Loans | Interest Only Loan | Other Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	265
Restructuring With Payment Default | Noncovered Loans | Interest Only Loan | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Interest Only Loan | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Interest Only Loan | Construction and Land Development - Non - Commercial
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Loan Term Extension
Financing Receivable, Modifications [Line Items]
Number of loans	2	7	18
Recorded investment at period end	776	2,121	6,309
Restructuring With Payment Default | Noncovered Loans | Loan Term Extension | Construction and Land Development - Commercial
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	509
Restructuring With Payment Default | Noncovered Loans | Loan Term Extension | Commercial Mortgage
Financing Receivable, Modifications [Line Items]
Number of loans	2	5	11
Recorded investment at period end	776	2,027	4,857
Restructuring With Payment Default | Noncovered Loans | Loan Term Extension | Other Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Loan Term Extension | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of loans	0	2	3
Recorded investment at period end	0	94	278
Restructuring With Payment Default | Noncovered Loans | Loan Term Extension | Finance Leases Financing Receivable
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Loan Term Extension | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	2
Recorded investment at period end	0	0	271
Restructuring With Payment Default | Noncovered Loans | Loan Term Extension | Construction and Land Development - Non - Commercial
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	394
Restructuring With Payment Default | Noncovered Loans | Loan Term Extension | Consumer
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Below Market Interest Rate
Financing Receivable, Modifications [Line Items]
Number of loans	2	3	7
Recorded investment at period end	407	785	3,160
Restructuring With Payment Default | Noncovered Loans | Below Market Interest Rate | Construction and Land Development - Commercial
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Below Market Interest Rate | Commercial Mortgage
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	3
Recorded investment at period end	0	0	2,336
Restructuring With Payment Default | Noncovered Loans | Below Market Interest Rate | Other Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Below Market Interest Rate | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	1
Recorded investment at period end	0	0	39
Restructuring With Payment Default | Noncovered Loans | Below Market Interest Rate | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Number of loans	2	3	3
Recorded investment at period end	407	785	785
Restructuring With Payment Default | Noncovered Loans | Below Market Interest Rate | Revolving Mortgage
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Below Market Interest Rate | Consumer
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Other Concession
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Other Concession | Commercial Mortgage
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	0	0	0
Restructuring With Payment Default | Noncovered Loans | Other Concession | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of loans	0	0	0
Recorded investment at period end	$ 0	$ 0	$ 0