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Note 17 - Fair Value Disclosure Measurements (Detail) - Assets Measured on a Recurring Basis (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis $ 194,472 $ 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 24,960 31,933
US Government Agencies Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 24,960 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 92,596 88,400
US States and Political Subdivisions Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 92,596 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 71,102 65,573
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 71,102 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 5,064 7,321
Mortgage-backed Securities, Issued by Private Enterprises [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 5,064 7,321
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 193,722 193,227
Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 193,722 193,227
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 745 745
Equity Securities in Financial Institutions [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 750 750
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 $ 194,467 $ 193,972