Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - Loans That Were Restructured (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Commercial And Industrial [Member]
Number of loans modified	2	10
Pre-modification recorded investment	$ 2,793	$ 886
Interest and escrow capitalized		7
Charge-offs	170
Post-modification recorded investment	2,623	893
Office Retail And Industrial [Member]
Number of loans modified	2	3
Pre-modification recorded investment	2,416	3,407
Funds disbursed		293
Interest and escrow capitalized		9
Post-modification recorded investment	2,416	3,709
Other Commercial Real Estate [Member]
Number of loans modified	7	1
Pre-modification recorded investment	11,906	174
Interest and escrow capitalized		74
Charge-offs	652
Post-modification recorded investment	11,254	248
1-4 Family Mortgages [Member]
Number of loans modified	4	12
Pre-modification recorded investment	563	1,236
Interest and escrow capitalized	4	89
Post-modification recorded investment	567	1,325
Total Restructured Loans [Member]
Number of loans modified	15	35
Pre-modification recorded investment	17,678	6,362
Funds disbursed		293
Interest and escrow capitalized	4	199
Charge-offs	822
Post-modification recorded investment	16,860	6,854
Home Equity1 [Member]
Number of loans modified		8
Pre-modification recorded investment		508
Interest and escrow capitalized		16
Post-modification recorded investment		524
Installment Loans [Member]
Number of loans modified		1
Pre-modification recorded investment		151
Interest and escrow capitalized		4
Post-modification recorded investment		$ 155