Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Construction and Land Development - Commercial	Jun. 30, 2011 Construction and Land Development - Commercial	Jun. 30, 2012 Construction and Land Development - Commercial	Jun. 30, 2011 Construction and Land Development - Commercial	Dec. 31, 2011 Construction and Land Development - Commercial	Jun. 30, 2012 Commercial Mortgage	Jun. 30, 2011 Commercial Mortgage	Jun. 30, 2012 Commercial Mortgage	Jun. 30, 2011 Commercial Mortgage	Dec. 31, 2011 Commercial Mortgage	Jun. 30, 2012 Other Commercial Real Estate	Jun. 30, 2011 Other Commercial Real Estate	Jun. 30, 2012 Other Commercial Real Estate	Jun. 30, 2011 Other Commercial Real Estate	Dec. 31, 2011 Other Commercial Real Estate	Jun. 30, 2012 Commercial and Industrial	Jun. 30, 2011 Commercial and Industrial	Jun. 30, 2012 Commercial and Industrial	Jun. 30, 2011 Commercial and Industrial	Dec. 31, 2011 Commercial and Industrial	Jun. 30, 2012 Lease Financing	Jun. 30, 2011 Lease Financing	Jun. 30, 2012 Lease Financing	Jun. 30, 2011 Lease Financing	Dec. 31, 2011 Lease Financing	Jun. 30, 2012 Other	Jun. 30, 2011 Other	Jun. 30, 2012 Other	Jun. 30, 2011 Other	Dec. 31, 2011 Other	Jun. 30, 2012 Revolving Mortgage	Jun. 30, 2012 Revolving Mortgage	Jun. 30, 2012 Residential Mortgage	Jun. 30, 2011 Residential Mortgage	Jun. 30, 2012 Residential Mortgage	Jun. 30, 2011 Residential Mortgage	Dec. 31, 2011 Residential Mortgage	Jun. 30, 2012 Construction and Land Development - Non - Commercial	Jun. 30, 2011 Construction and Land Development - Non - Commercial	Jun. 30, 2012 Construction and Land Development - Non - Commercial	Jun. 30, 2011 Construction and Land Development - Non - Commercial	Dec. 31, 2011 Construction and Land Development - Non - Commercial	Jun. 30, 2012 Consumer	Jun. 30, 2011 Consumer	Jun. 30, 2012 Consumer	Jun. 30, 2011 Consumer	Dec. 31, 2011 Consumer	Jun. 30, 2012 With A Recorded Allowance	Dec. 31, 2011 With A Recorded Allowance	Jun. 30, 2011 With A Recorded Allowance	Jun. 30, 2012 With A Recorded Allowance Construction and Land Development - Commercial	Dec. 31, 2011 With A Recorded Allowance Construction and Land Development - Commercial	Jun. 30, 2011 With A Recorded Allowance Construction and Land Development - Commercial	Jun. 30, 2012 With A Recorded Allowance Commercial Mortgage	Dec. 31, 2011 With A Recorded Allowance Commercial Mortgage	Jun. 30, 2011 With A Recorded Allowance Commercial Mortgage	Jun. 30, 2012 With A Recorded Allowance Other Commercial Real Estate	Dec. 31, 2011 With A Recorded Allowance Other Commercial Real Estate	Jun. 30, 2011 With A Recorded Allowance Other Commercial Real Estate	Jun. 30, 2012 With A Recorded Allowance Commercial and Industrial	Dec. 31, 2011 With A Recorded Allowance Commercial and Industrial	Jun. 30, 2011 With A Recorded Allowance Commercial and Industrial	Jun. 30, 2012 With A Recorded Allowance Lease Financing	Dec. 31, 2011 With A Recorded Allowance Lease Financing	Jun. 30, 2011 With A Recorded Allowance Lease Financing	Jun. 30, 2012 With A Recorded Allowance Other	Dec. 31, 2011 With A Recorded Allowance Other	Jun. 30, 2011 With A Recorded Allowance Other	Jun. 30, 2012 With A Recorded Allowance Revolving Mortgage	Jun. 30, 2012 With A Recorded Allowance Residential Mortgage	Dec. 31, 2011 With A Recorded Allowance Residential Mortgage	Jun. 30, 2011 With A Recorded Allowance Residential Mortgage	Jun. 30, 2012 With A Recorded Allowance Construction and Land Development - Non - Commercial	Dec. 31, 2011 With A Recorded Allowance Construction and Land Development - Non - Commercial	Jun. 30, 2011 With A Recorded Allowance Construction and Land Development - Non - Commercial	Jun. 30, 2012 With A Recorded Allowance Consumer	Dec. 31, 2011 With A Recorded Allowance Consumer	Jun. 30, 2011 With A Recorded Allowance Consumer	Jun. 30, 2012 With No Recorded Allowance	Dec. 31, 2011 With No Recorded Allowance	Jun. 30, 2011 With No Recorded Allowance	Jun. 30, 2012 With No Recorded Allowance Construction and Land Development - Commercial	Dec. 31, 2011 With No Recorded Allowance Construction and Land Development - Commercial	Jun. 30, 2011 With No Recorded Allowance Construction and Land Development - Commercial	Jun. 30, 2012 With No Recorded Allowance Commercial Mortgage	Dec. 31, 2011 With No Recorded Allowance Commercial Mortgage	Jun. 30, 2011 With No Recorded Allowance Commercial Mortgage	Jun. 30, 2012 With No Recorded Allowance Other Commercial Real Estate	Dec. 31, 2011 With No Recorded Allowance Other Commercial Real Estate	Jun. 30, 2011 With No Recorded Allowance Other Commercial Real Estate	Jun. 30, 2012 With No Recorded Allowance Commercial and Industrial	Dec. 31, 2011 With No Recorded Allowance Commercial and Industrial	Jun. 30, 2011 With No Recorded Allowance Commercial and Industrial	Jun. 30, 2012 With No Recorded Allowance Lease Financing	Dec. 31, 2011 With No Recorded Allowance Lease Financing	Jun. 30, 2011 With No Recorded Allowance Lease Financing	Jun. 30, 2012 With No Recorded Allowance Other	Dec. 31, 2011 With No Recorded Allowance Other	Jun. 30, 2011 With No Recorded Allowance Other	Jun. 30, 2012 With No Recorded Allowance Revolving Mortgage	Jun. 30, 2012 With No Recorded Allowance Residential Mortgage	Dec. 31, 2011 With No Recorded Allowance Residential Mortgage	Jun. 30, 2011 With No Recorded Allowance Residential Mortgage	Jun. 30, 2012 With No Recorded Allowance Construction and Land Development - Non - Commercial	Dec. 31, 2011 With No Recorded Allowance Construction and Land Development - Non - Commercial	Jun. 30, 2011 With No Recorded Allowance Construction and Land Development - Non - Commercial	Jun. 30, 2012 With No Recorded Allowance Consumer	Dec. 31, 2011 With No Recorded Allowance Consumer	Jun. 30, 2011 With No Recorded Allowance Consumer	Jun. 30, 2012 Noncovered Loans	Mar. 31, 2012 Noncovered Loans	Jun. 30, 2012 Covered Loans With No Recorded Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total impaired noncovered loans and leases	$ 191,890	$ 129,188	$ 191,890	$ 129,188	$ 122,135	$ 27,173	$ 28,274	$ 27,173	$ 28,274	$ 24,994	$ 117,967	$ 69,806	$ 117,967	$ 69,806	$ 65,527	$ 3,709	$ 1,770	$ 3,709	$ 1,770	$ 2,580	$ 13,927	$ 14,063	$ 13,927	$ 14,063	$ 14,268	$ 292	$ 617	$ 292	$ 617	$ 322	$ 742	$ 0	$ 742	$ 0	$ 0	$ 3,594	$ 3,594	$ 17,920	$ 11,102	$ 17,920	$ 11,102	$ 9,776	$ 3,458	$ 2,562	$ 3,458	$ 2,562	$ 3,676	$ 3,108	$ 994	$ 3,108	$ 994	$ 992	$ 97,691	$ 102,162	$ 115,471	$ 8,700	$ 24,994	$ 27,237	$ 64,016	$ 53,687	$ 64,272	$ 1,218	$ 1,558	$ 1,770	$ 5,923	$ 7,157	$ 6,917	$ 292	$ 322	$ 617	$ 0	$ 0	$ 0	$ 1,240	$ 13,076	$ 9,776	$ 11,102	$ 1,311	$ 3,676	$ 2,562	$ 1,915	$ 992	$ 994	$ 94,199	$ 19,973	$ 13,717	$ 18,473	$ 0	$ 1,037	$ 53,951	$ 11,840	$ 5,534	$ 2,491	$ 1,022	$ 0	$ 8,004	$ 7,111	$ 7,146	$ 0	$ 0	$ 0	$ 742	$ 0	$ 0	$ 2,354	$ 4,844	$ 0	$ 0	$ 2,147	$ 0	$ 0	$ 1,193	$ 0	$ 0
Impaired noncovered loans and leases																																																					14,826	6,122	11,925	1,555	1,027	5,526	8,811	3,813	5,272	435	114	56	2,070	549	430	66	16	48	0	0	0	51	1,380	411	455	205	145	93	253	47	45
Average balance	207,729	118,635	159,720	118,978		32,549	28,541	27,118	28,819		123,944	65,763	92,357	65,937		4,181	1,358	3,140	1,227		15,267	10,953	14,135	12,454		420	790	339	758		247	0	124	38		3,904	1,956	21,022	9,144	15,298	8,150		3,858	1,538	3,518	1,196		2,337	548	1,735	399
Unpaid principal balance	213,109	129,842	213,109	129,842	129,842	44,157	28,475	44,157	28,475	28,475	121,543	70,259	121,543	70,259	70,259	3,871	1,770	3,871	1,770	1,770	13,988	14,063	13,988	14,063	14,063	292	617	292	617	617	742	0	742	0	0	3,594	3,594	18,355	11,102	18,355	11,102	11,102	3,458	2,562	3,458	2,562	2,562	3,109	994	3,109	994	994
Interest income recognized	1,652	608	2,193	1,673		249	32	283	104		1,062	340	1,414	1,078		48	15	48	25		66	58	120	223		3	0	4	12		13	0	13	0		20	20	154	116	234	176		31	39	50	45		6	8	7	10
Troubled debt restructurings	308,038		308,038																																																																																																																29,810
Amount of individual loan impairment analysis in estimation methodology																																																																																																																			75,579
Threshold amount for individual impairment analysis																																																																																																																			500	1,000
Loans with an adverse change in expected cash flows																																																																																																																					$ 681,181