Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - Credit Quality Indicators by Class, Excluding Covered Loans (Continued) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Commercial Loan [Member] | Performing [Member]
Credit Quality Indicators by Class	$ 278,074
Commercial Loan [Member] | Non-Accrual [Member]
Credit Quality Indicators by Class	4,874
Commercial Loan [Member] | Total [Member]
Credit Quality Indicators by Class	282,948
Residential Mortgage [Member] | Performing [Member]
Credit Quality Indicators by Class		195,777
Residential Mortgage [Member] | Non-Accrual [Member]
Credit Quality Indicators by Class		5,322
Residential Mortgage [Member] | Total [Member]
Credit Quality Indicators by Class		201,099
Home Equity1 [Member] | Performing [Member]
Credit Quality Indicators by Class	383,844	408,787
Home Equity1 [Member] | Non-Accrual [Member]
Credit Quality Indicators by Class	6,189	7,407
Home Equity1 [Member] | Total [Member]
Credit Quality Indicators by Class	390,033	416,194
Installment Loans [Member] | Performing [Member]
Credit Quality Indicators by Class	38,394	42,264
Installment Loans [Member] | Non-Accrual [Member]
Credit Quality Indicators by Class		25
Installment Loans [Member] | Total [Member]
Credit Quality Indicators by Class	38,394	42,289
Total Consumer Loans [Member] | Performing [Member]
Credit Quality Indicators by Class	700,312	646,828
Total Consumer Loans [Member] | Non-Accrual [Member]
Credit Quality Indicators by Class	11,063	12,754
Total Consumer Loans [Member] | Total [Member]
Credit Quality Indicators by Class	$ 711,375	$ 659,582