Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance	$ 70,587		$ 181,719		$ 66,793		$ 177,576
Interest Income Recognized	12	[1]	6	[1]	21	[1]	15	[1]
Commercial and Industrial [Member]
Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance	25,757		55,623		24,429		50,626
Interest Income Recognized	1	[1]	0	[1]	3	[1]	9	[1]
Agricultural [Member]
Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance	0		932		0		927
Interest Income Recognized	0	[1]	0	[1]	0	[1]	0	[1]
Office Retail And Industrial [Member]
Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance	23,662		35,348		22,316		32,015
Interest Income Recognized	6	[1]	0	[1]	10	[1]	0	[1]
Multi-Family [Member]
Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance	1,009		9,424		845		7,976
Interest Income Recognized	0	[1]	0	[1]	0	[1]	0	[1]
Residential Construction [Member]
Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance	4,018		19,912		3,471		18,493
Interest Income Recognized	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Construction [Member]
Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance	2,379		20,353		2,379		21,554
Interest Income Recognized	0	[1]	0	[1]	0	[1]	0	[1]
Other Commercial Real Estate [Member]
Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance	13,762		40,127		13,353		45,985
Interest Income Recognized	5	[1]	6	[1]	8	[1]	6	[1]
Total Commercial Real Estate [Member]
Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - Impaired Loans Individually Evaluated by Class (Continued) [Line Items]
Average Recorded Balance	44,830		125,164		42,364		126,023
Interest Income Recognized	$ 11	[1]	$ 6	[1]	$ 18	[1]	$ 6	[1]

[1] Recorded using the cash basis of accounting.