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Note 4 - Fair Value Disclosure Measurements (Detail) - Assets Measured on a Recurring Basis (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis $ 190,687 $ 194,472
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 25,752 24,960
US Government Agencies Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 25,752 24,960
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 94,462 92,596
US States and Political Subdivisions Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 94,462 92,596
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 65,026 71,102
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 65,026 71,102
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 4,697 5,064
Mortgage-backed Securities, Issued by Private Enterprises [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 4,697 5,064
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 189,937 193,722
Debt Securities [Member]
    
Assets measured on a recurring basis:    
Assets Measured on a Recurring Basis 189,937 193,722
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 $ 190,682 $ 194,467