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, 2011	Dec. 31, 2010
Performing [Member] | Home Equity [Member]
Credit Quality Indicators by Class	$ 408,787	$ 437,295
Performing [Member] | 1-4 Family Mortgages [Member]
Credit Quality Indicators by Class	195,777	156,988
Performing [Member] | Installment Loans [Member]
Credit Quality Indicators by Class	42,264	51,615
Performing [Member] | Total Consumer Loans [Member]
Credit Quality Indicators by Class	646,828	645,898
Non-Accrual [Member] | Home Equity [Member]
Credit Quality Indicators by Class	7,407	7,948
Non-Accrual [Member] | 1-4 Family Mortgages [Member]
Credit Quality Indicators by Class	5,322	3,902
Non-Accrual [Member] | Installment Loans [Member]
Credit Quality Indicators by Class	25	159
Non-Accrual [Member] | Total Consumer Loans [Member]
Credit Quality Indicators by Class	12,754	12,009
Total [Member] | Home Equity [Member]
Credit Quality Indicators by Class	416,194	445,243
Total [Member] | 1-4 Family Mortgages [Member]
Credit Quality Indicators by Class	201,099	160,890
Total [Member] | Installment Loans [Member]
Credit Quality Indicators by Class	42,289	51,774
Total [Member] | Total Consumer Loans [Member]
Credit Quality Indicators by Class	$ 659,582	$ 657,907