Loan and Lease Finance Receivables and Allowance for Credit Losses (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Loans
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	25
Troubled debt restructurings, pre-modification outstanding recorded investment	$ 56,592
Troubled debt restructurings, post-modifications outstanding recorded investment	56,290
Troubled debt restructurings, outstanding recorded investment	49,851
Covered Loans [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	0
Troubled debt restructurings, pre-modification outstanding recorded investment	0
Troubled debt restructurings, post-modifications outstanding recorded investment	0
Troubled debt restructurings, outstanding recorded investment	0
Non-Covered Loans [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	25
Troubled debt restructurings, pre-modification outstanding recorded investment	56,592
Troubled debt restructurings, post-modifications outstanding recorded investment	56,290
Troubled debt restructurings, outstanding recorded investment	49,851
Commercial and Industrial [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	5
Troubled debt restructurings, pre-modification outstanding recorded investment	1,673
Troubled debt restructurings, post-modifications outstanding recorded investment	1,372
Troubled debt restructurings, outstanding recorded investment	1,224
Construction - Speculative [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	2
Troubled debt restructurings, pre-modification outstanding recorded investment	16,886
Troubled debt restructurings, post-modifications outstanding recorded investment	16,886
Troubled debt restructurings, outstanding recorded investment	15,394
Construction - Non-Speculative [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	1
Troubled debt restructurings, pre-modification outstanding recorded investment	9,219
Troubled debt restructurings, post-modifications outstanding recorded investment	9,219
Troubled debt restructurings, outstanding recorded investment	9,219
Commercial Real Estate - Owner-Occupied [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	3
Troubled debt restructurings, pre-modification outstanding recorded investment	3,195
Troubled debt restructurings, post-modifications outstanding recorded investment	3,195
Troubled debt restructurings, outstanding recorded investment	3,067
Commercial Real Estate - Non-Owner-Occupied [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	3
Troubled debt restructurings, pre-modification outstanding recorded investment	11,707
Troubled debt restructurings, post-modifications outstanding recorded investment	11,707
Troubled debt restructurings, outstanding recorded investment	10,236
Residential Real Estate (SFR 1-4) [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	6
Troubled debt restructurings, pre-modification outstanding recorded investment	2,162
Troubled debt restructurings, post-modifications outstanding recorded investment	2,161
Troubled debt restructurings, outstanding recorded investment	2,049
Dairy and Livestock [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	5
Troubled debt restructurings, pre-modification outstanding recorded investment	11,750
Troubled debt restructurings, post-modifications outstanding recorded investment	11,750
Troubled debt restructurings, outstanding recorded investment	8,662
Agribusiness [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	0
Troubled debt restructurings, pre-modification outstanding recorded investment	0
Troubled debt restructurings, post-modifications outstanding recorded investment	0
Troubled debt restructurings, outstanding recorded investment	0
Municipal Lease Finance Receivables [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	0
Troubled debt restructurings, pre-modification outstanding recorded investment	0
Troubled debt restructurings, post-modifications outstanding recorded investment	0
Troubled debt restructurings, outstanding recorded investment	0
Consumer [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	0
Troubled debt restructurings, pre-modification outstanding recorded investment	0
Troubled debt restructurings, post-modifications outstanding recorded investment	0
Troubled debt restructurings, outstanding recorded investment	0
Auto and Equipment Leases [Member]
Loans modified as troubled debt restructuring
Troubled debt restructurings, number of loans	0
Troubled debt restructurings, pre-modification outstanding recorded investment	0
Troubled debt restructurings, post-modifications outstanding recorded investment	0
Troubled debt restructurings, outstanding recorded investment	$ 0