Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - TDRs That Defaulted Within Twelve Months Of Being Restructured (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Pre- Charge-off Recorded Investment	-
Commercial And Industrial [Member]
Number of Loans	7
Pre- Charge-off Recorded Investment	$1,163
Principal Charged-off	$ (552)
Post- Charge-off Recorded Investment	611
Agricultural [Member]
Pre- Charge-off Recorded Investment	-
Office Retail And Industrial [Member]
Number of Loans	1
Pre- Charge-off Recorded Investment	397
Principal Charged-off	(397)
Multi-Family [Member]
Number of Loans	13
Pre- Charge-off Recorded Investment	4,590
Principal Charged-off	(1,324)
Post- Charge-off Recorded Investment	3,266
Residential Construction [Member]
Number of Loans	4
Pre- Charge-off Recorded Investment	4,295
Principal Charged-off	(2,106)
Post- Charge-off Recorded Investment	2,189
Commercial Construction [Member]
Number of Loans	1
Pre- Charge-off Recorded Investment	17,508
Principal Charged-off	(3,502)
Post- Charge-off Recorded Investment	14,006
Other Commercial Real Estate [Member]
Number of Loans	2
Pre- Charge-off Recorded Investment	823
Principal Charged-off	(435)
Post- Charge-off Recorded Investment	388
Total Commercial Real Estate [Member]
Number of Loans	21
Pre- Charge-off Recorded Investment	27,613
Principal Charged-off	(7,764)
Post- Charge-off Recorded Investment	19,849
Total Corporate Loans [Member]
Number of Loans	28
Pre- Charge-off Recorded Investment	28,776
Principal Charged-off	(8,316)
Post- Charge-off Recorded Investment	20,460
Home Equity [Member]
Number of Loans	6
Pre- Charge-off Recorded Investment	430
Principal Charged-off	(333)
Post- Charge-off Recorded Investment	97
1-4 Family Mortgages [Member]
Number of Loans	4
Pre- Charge-off Recorded Investment	482
Principal Charged-off	(241)
Post- Charge-off Recorded Investment	241
Total Consumer Loans [Member]
Number of Loans	10
Pre- Charge-off Recorded Investment	912
Principal Charged-off	(574)
Post- Charge-off Recorded Investment	338
Total TDRs With Charge Offs [Member]
Number of Loans	38
Pre- Charge-off Recorded Investment	$29,688
Principal Charged-off	(8,890)
Post- Charge-off Recorded Investment	20,798
TDRs Still Accruing Interest [Member]
Pre- Charge-off Recorded Investment	$-
TDRs Included In Nonaccrual [Member]
Number of Loans	38
Pre- Charge-off Recorded Investment	29,688
Principal Charged-off	(8,890)
Post- Charge-off Recorded Investment	20,798
Loans Total [Member]
Number of Loans	38
Pre- Charge-off Recorded Investment	$29,688
Principal Charged-off	(8,890)
Post- Charge-off Recorded Investment	$ 20,798