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Note 8 - Income Taxes (Detail) - Reconciliation of Income Tax Expense (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Computed at the statutory rate (35%)     $ 6,425 $ 5,744
Increase (decrease) in taxes resulting from:        
State income taxes, net of federal tax benefit     490 370
Other differences, net     146 174
Actual tax provision 2,789 2,848 5,467 4,598
Tax Exempt Interest Income [Member]
       
Increase (decrease) in taxes resulting from:        
Tax exempt interest income     (1,341) (1,404)
Tax Exempt Earnings on Bank Owned Life Insurance [Member]
       
Increase (decrease) in taxes resulting from:        
Tax exempt earnings on BOLI     $ (253) $ (286)