Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Construction and Land Development - Commercial	Sep. 30, 2011 Construction and Land Development - Commercial	Sep. 30, 2012 Construction and Land Development - Commercial	Sep. 30, 2011 Construction and Land Development - Commercial	Dec. 31, 2011 Construction and Land Development - Commercial	Sep. 30, 2012 Commercial Mortgage	Sep. 30, 2011 Commercial Mortgage	Sep. 30, 2012 Commercial Mortgage	Sep. 30, 2011 Commercial Mortgage	Dec. 31, 2011 Commercial Mortgage	Sep. 30, 2012 Other Commercial Real Estate	Sep. 30, 2011 Other Commercial Real Estate	Sep. 30, 2012 Other Commercial Real Estate	Sep. 30, 2011 Other Commercial Real Estate	Dec. 31, 2011 Other Commercial Real Estate	Sep. 30, 2012 Commercial and Industrial	Sep. 30, 2011 Commercial and Industrial	Sep. 30, 2012 Commercial and Industrial	Sep. 30, 2011 Commercial and Industrial	Dec. 31, 2011 Commercial and Industrial	Sep. 30, 2012 Lease Financing	Sep. 30, 2011 Lease Financing	Sep. 30, 2012 Lease Financing	Sep. 30, 2011 Lease Financing	Dec. 31, 2011 Lease Financing	Sep. 30, 2012 Other	Sep. 30, 2011 Other	Sep. 30, 2012 Other	Sep. 30, 2011 Other	Dec. 31, 2011 Other	Sep. 30, 2012 Revolving Mortgage	Sep. 30, 2012 Revolving Mortgage	Sep. 30, 2012 Residential Mortgage	Sep. 30, 2011 Residential Mortgage	Sep. 30, 2012 Residential Mortgage	Sep. 30, 2011 Residential Mortgage	Dec. 31, 2011 Residential Mortgage	Sep. 30, 2012 Construction and Land Development - Non - Commercial	Sep. 30, 2011 Construction and Land Development - Non - Commercial	Sep. 30, 2012 Construction and Land Development - Non - Commercial	Sep. 30, 2011 Construction and Land Development - Non - Commercial	Dec. 31, 2011 Construction and Land Development - Non - Commercial	Sep. 30, 2012 Consumer	Sep. 30, 2011 Consumer	Sep. 30, 2012 Consumer	Sep. 30, 2011 Consumer	Dec. 31, 2011 Consumer	Sep. 30, 2012 With A Recorded Allowance	Dec. 31, 2011 With A Recorded Allowance	Sep. 30, 2011 With A Recorded Allowance	Sep. 30, 2012 With A Recorded Allowance Construction and Land Development - Commercial	Dec. 31, 2011 With A Recorded Allowance Construction and Land Development - Commercial	Sep. 30, 2011 With A Recorded Allowance Construction and Land Development - Commercial	Sep. 30, 2012 With A Recorded Allowance Commercial Mortgage	Dec. 31, 2011 With A Recorded Allowance Commercial Mortgage	Sep. 30, 2011 With A Recorded Allowance Commercial Mortgage	Sep. 30, 2012 With A Recorded Allowance Other Commercial Real Estate	Dec. 31, 2011 With A Recorded Allowance Other Commercial Real Estate	Sep. 30, 2011 With A Recorded Allowance Other Commercial Real Estate	Sep. 30, 2012 With A Recorded Allowance Commercial and Industrial	Dec. 31, 2011 With A Recorded Allowance Commercial and Industrial	Sep. 30, 2011 With A Recorded Allowance Commercial and Industrial	Sep. 30, 2012 With A Recorded Allowance Lease Financing	Dec. 31, 2011 With A Recorded Allowance Lease Financing	Sep. 30, 2011 With A Recorded Allowance Lease Financing	Sep. 30, 2012 With A Recorded Allowance Other	Dec. 31, 2011 With A Recorded Allowance Other	Sep. 30, 2011 With A Recorded Allowance Other	Sep. 30, 2012 With A Recorded Allowance Revolving Mortgage	Sep. 30, 2012 With A Recorded Allowance Residential Mortgage	Dec. 31, 2011 With A Recorded Allowance Residential Mortgage	Sep. 30, 2011 With A Recorded Allowance Residential Mortgage	Sep. 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	Sep. 30, 2011 With A Recorded Allowance Construction and Land Development - Non - Commercial	Sep. 30, 2012 With A Recorded Allowance Consumer	Dec. 31, 2011 With A Recorded Allowance Consumer	Sep. 30, 2011 With A Recorded Allowance Consumer	Sep. 30, 2012 With No Recorded Allowance	Dec. 31, 2011 With No Recorded Allowance	Sep. 30, 2011 With No Recorded Allowance	Sep. 30, 2012 With No Recorded Allowance Construction and Land Development - Commercial	Dec. 31, 2011 With No Recorded Allowance Construction and Land Development - Commercial	Sep. 30, 2011 With No Recorded Allowance Construction and Land Development - Commercial	Sep. 30, 2012 With No Recorded Allowance Commercial Mortgage	Dec. 31, 2011 With No Recorded Allowance Commercial Mortgage	Sep. 30, 2011 With No Recorded Allowance Commercial Mortgage	Sep. 30, 2012 With No Recorded Allowance Other Commercial Real Estate	Dec. 31, 2011 With No Recorded Allowance Other Commercial Real Estate	Sep. 30, 2011 With No Recorded Allowance Other Commercial Real Estate	Sep. 30, 2012 With No Recorded Allowance Commercial and Industrial	Dec. 31, 2011 With No Recorded Allowance Commercial and Industrial	Sep. 30, 2011 With No Recorded Allowance Commercial and Industrial	Sep. 30, 2012 With No Recorded Allowance Lease Financing	Dec. 31, 2011 With No Recorded Allowance Lease Financing	Sep. 30, 2011 With No Recorded Allowance Lease Financing	Sep. 30, 2012 With No Recorded Allowance Other	Dec. 31, 2011 With No Recorded Allowance Other	Sep. 30, 2011 With No Recorded Allowance Other	Sep. 30, 2012 With No Recorded Allowance Revolving Mortgage	Sep. 30, 2012 With No Recorded Allowance Residential Mortgage	Dec. 31, 2011 With No Recorded Allowance Residential Mortgage	Sep. 30, 2011 With No Recorded Allowance Residential Mortgage	Sep. 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	Sep. 30, 2011 With No Recorded Allowance Construction and Land Development - Non - Commercial	Sep. 30, 2012 With No Recorded Allowance Consumer	Dec. 31, 2011 With No Recorded Allowance Consumer	Sep. 30, 2011 With No Recorded Allowance Consumer	Sep. 30, 2012 Noncovered Loans	Jun. 30, 2012 Noncovered Loans	Mar. 31, 2012 Noncovered Loans	Sep. 30, 2011 Noncovered Loans	Sep. 30, 2012 Covered Loans With No Recorded Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total impaired noncovered loans and leases	$ 162,252	$ 119,599	$ 162,252	$ 119,599	$ 122,135	$ 23,140	$ 22,001	$ 23,140	$ 22,001	$ 24,994	$ 98,575	$ 66,588	$ 98,575	$ 66,588	$ 65,527	$ 2,183	$ 580	$ 2,183	$ 580	$ 2,580	$ 13,578	$ 14,222	$ 13,578	$ 14,222	$ 14,268	$ 685	$ 339	$ 685	$ 339	$ 322	$ 729	$ 0	$ 729	$ 0	$ 0	$ 3,593	$ 3,593	$ 15,617	$ 12,033	$ 15,617	$ 12,033	$ 9,776	$ 3,012	$ 2,844	$ 3,012	$ 2,844	$ 3,676	$ 1,140	$ 992	$ 1,140	$ 992	$ 992	$ 75,976	$ 102,162	$ 88,275	$ 13,305	$ 24,994	$ 4,897	$ 40,140	$ 53,687	$ 59,491	$ 1,383	$ 1,558	$ 580	$ 6,380	$ 7,157	$ 7,099	$ 171	$ 322	$ 339	$ 729	$ 0	$ 0	$ 1,239	$ 11,078	$ 9,776	$ 12,033	$ 1,311	$ 3,676	$ 2,844	$ 240	$ 992	$ 992	$ 86,276	$ 19,973	$ 31,324	$ 9,835	$ 0	$ 17,104	$ 58,435	$ 11,840	$ 7,097	$ 800	$ 1,022	$ 0	$ 7,198	$ 7,111	$ 7,123	$ 514	$ 0	$ 0	$ 0	$ 0	$ 0	$ 2,354	$ 4,539	$ 0	$ 0	$ 1,701	$ 0	$ 0	$ 900	$ 0	$ 0
Unpaid principal balance	180,892	125,078	180,892	125,078	131,731	39,181	27,162	39,181	27,162	30,756	100,477	66,906	100,477	66,906	66,463	2,183	580	2,183	580	322	13,638	14,222	13,638	14,222	12,674	685	339	685	339	992	729	0	729	0	0	3,593	3,593	16,254	12,033	16,254	12,033	2,580	3,012	2,844	3,012	2,844	14,268	1,140	992	1,140	992	3,676
Related allowance recorded																																																					15,903	6,122	6,614	2,912	1,027	310	9,639	3,813	4,641	207	114	43	1,606	549	433	198	16	25	59	0	0	1	905	411	1,025	298	145	92	78	47	45
Average balance	166,518	123,805	152,660	119,034		24,046	24,311	24,595	27,151		100,751	68,436	90,544	66,110		2,191	1,175	2,502	1,065		13,414	14,142	11,847	12,741		689	478	412	653		734	0	327	38		3,592	2,507	16,111	11,567	15,278	9,121		3,012	2,703	3,017	1,608		1,978	993	1,631	547
Interest income recognized	2,067	594	5,885	2,267		239	5	756	109		1,332	297	3,621	1,375		33	0	83	25		186	149	682	372		11	3	22	15		0	0	0	0		20	40	206	100	536	276		33	38	122	83		7	2	23	12
Troubled debt restructurings	298,495	277,699	298,495	277,699	323,061																																																																																																														29,245			42,246
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																																																																																																																							$ 766,627