Loan and Lease Finance Receivables and Allowance for Credit Losses (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	$ 101,226	$ 170,294
Unpaid principal balance	119,497	233,327
Related allowance	2,968	4,059
Average recorded investment	107,665	210,863
Interest income, Recognized	2,225	837
With a related allowance recorded [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	11,204	13,742
Unpaid principal balance	13,476	18,520
Related allowance	2,968	4,059
Average recorded investment	12,326	14,930
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Commercial and Industrial [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	1,388	344
Unpaid principal balance	1,410	352
Related allowance	165	50
Average recorded investment	1,554	371
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Construction - Speculative [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	0	7,880
Unpaid principal balance	0	12,588
Related allowance	0	3,300
Average recorded investment	0	8,966
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Construction - Non-Speculative [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	0	0
Unpaid principal balance	0	0
Related allowance	0	0
Average recorded investment	0	0
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Commercial Real Estate - Owner-Occupied [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	3,900	929
Unpaid principal balance	3,900	929
Related allowance	928	136
Average recorded investment	3,900	934
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Commercial Real Estate - Non-Owner-Occupied [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	83	303
Unpaid principal balance	85	311
Related allowance	5	25
Average recorded investment	86	308
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Residential Real Estate (SFR 1-4) [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	4,087	4,034
Unpaid principal balance	4,369	4,086
Related allowance	406	520
Average recorded investment	3,967	4,067
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Dairy Livestock & Agribusiness [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	1,372	0
Unpaid principal balance	3,324	0
Related allowance	1,372	0
Average recorded investment	2,402	0
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Municipal Lease Finance Receivables [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	0	0
Unpaid principal balance	0	0
Related allowance	0	0
Average recorded investment	0	0
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Consumer [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	270	203
Unpaid principal balance	278	205
Related allowance	77	21
Average recorded investment	276	207
Interest income, Recognized	0	0
With a related allowance recorded [Member] | Auto and Equipment Leases [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	104	49
Unpaid principal balance	110	49
Related allowance	15	7
Average recorded investment	141	77
Interest income, Recognized	0	0
With No Related Allowance Recorded [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	90,022	156,552
Unpaid principal balance	106,021	214,807
Related allowance	0	0
Average recorded investment	95,339	195,933
Interest income, Recognized	2,225	837
With No Related Allowance Recorded [Member] | Commercial and Industrial [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	3,566	9,060
Unpaid principal balance	4,630	9,600
Related allowance	0	0
Average recorded investment	4,649	9,972
Interest income, Recognized	93	339
With No Related Allowance Recorded [Member] | Held for Sale Construction - Speculative [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	0	1,656
Unpaid principal balance	0	3,739
Related allowance	0	0
Average recorded investment	0	2,311
Interest income, Recognized	0	0
With No Related Allowance Recorded [Member] | Construction - Speculative [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	13,317	45,672
Unpaid principal balance	15,718	61,382
Related allowance	0	0
Average recorded investment	15,434	54,299
Interest income, Recognized	0	0
With No Related Allowance Recorded [Member] | Construction - Non-Speculative [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	20,085	9,473
Unpaid principal balance	20,085	10,149
Related allowance	0	0
Average recorded investment	16,437	9,777
Interest income, Recognized	1,123	0
With No Related Allowance Recorded [Member] | Commercial Real Estate - Owner-Occupied [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	13,567	4,528
Unpaid principal balance	14,013	4,528
Related allowance	0	0
Average recorded investment	11,941	4,541
Interest income, Recognized	449	0
With No Related Allowance Recorded [Member] | Commercial Real Estate - Non-Owner-Occupied [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	16,435	66,856
Unpaid principal balance	23,656	103,010
Related allowance	0	0
Average recorded investment	21,096	93,807
Interest income, Recognized	67	498
With No Related Allowance Recorded [Member] | Residential Real Estate (SFR 1-4) [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	14,069	13,766
Unpaid principal balance	17,411	16,285
Related allowance	0	0
Average recorded investment	15,120	14,556
Interest income, Recognized	47	0
With No Related Allowance Recorded [Member] | Dairy and Livestock [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	8,879	5,207
Unpaid principal balance	10,358	5,780
Related allowance	0	0
Average recorded investment	10,535	6,334
Interest income, Recognized	446	0
With No Related Allowance Recorded [Member] | Municipal Lease Finance Receivables [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	0	0
Unpaid principal balance	0	0
Related allowance	0	0
Average recorded investment	0	0
Interest income, Recognized	0	0
With No Related Allowance Recorded [Member] | Consumer [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	104	334
Unpaid principal balance	150	334
Related allowance	0	0
Average recorded investment	127	336
Interest income, Recognized	0	0
With No Related Allowance Recorded [Member] | Auto and Equipment Leases [Member]
Held-For-Investment And Held-For-Sale Loans Individually Evaluated For Impairment By Class Of Loans
Recorded investment	0	0
Unpaid principal balance	0	0
Related allowance	0	0
Average recorded investment	0	0
Interest income, Recognized	$ 0	$ 0