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Note 4 - Fair Value Measurements (Detail) - Assets Measured on a Recurring Basis (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis $ 179,140 $ 193,977
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 17,268 31,933
US Government Agencies Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 17,268 31,933
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 92,668 88,400
US States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 92,668 88,400
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 62,467 65,573
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 62,467 65,573
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 5,986 7,321
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 5,986 7,321
Mortgage-backed Securities, Issued by Private Enterprises [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 5,400  
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 178,389 193,227
Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 178,389 193,227
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 1 [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 5 5
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 746 745
Equity Securities in Financial Institutions [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 751 750
Fair Value, Inputs, Level 1 [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 5 5
Fair Value, Inputs, Level 2 [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis 179,135 193,972
Estimate of Fair Value, Fair Value Disclosure [Member]
    
Assets Measured on a Recurring Basis:    
Assets Measured on a Recurring Basis $ 179,140 $ 193,977