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Fair Value - Fair Value of Assets and Liabilities on Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities $ 1,133 $ 1,084
Level 1 | Interest Rate Swap Agreements
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0 0
Derivative liabilities 0 0
Level 1 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0  
Derivative liabilities   0
Level 1 | Forward Sales Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets   0
Derivative liabilities 0  
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 338,339 329,338
Level 2 | Interest Rate Swap Agreements
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0 0
Derivative liabilities 0 0
Level 2 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0  
Derivative liabilities   0
Level 2 | Forward Sales Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets   57
Derivative liabilities (102)  
Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Level 3 | Interest Rate Swap Agreements
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 213 216
Derivative liabilities (213) (216)
Level 3 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 577  
Derivative liabilities   (130)
Level 3 | Forward Sales Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets   0
Derivative liabilities 0  
Recurring | Estimated Fair Value | Interest Rate Swap Agreements
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 213 216
Derivative liabilities (213) (216)
Recurring | Estimated Fair Value | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 577 130
Recurring | Estimated Fair Value | Forward Sales Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets   57
Derivative liabilities (102)  
Recurring | Estimated Fair Value | Mortgage Servicing Rights
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 1,889 1,871
Recurring | Estimated Fair Value | U.S. government agencies
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 23,059 23,726
Recurring | Estimated Fair Value | Government sponsored agencies - Residential mortgage-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 80,459 65,210
Recurring | Estimated Fair Value | Government sponsored agencies - Collateralized mortgage obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 167,065 166,028
Recurring | Estimated Fair Value | Private label collateralized mortgage obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 1,149 1,256
Recurring | Estimated Fair Value | State and municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 66,607 73,118
Recurring | Estimated Fair Value | Common and preferred stocks
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 1,133 1,084
Recurring | Level 1 | Interest Rate Swap Agreements
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring | Level 1 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0 0
Recurring | Level 1 | Forward Sales Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets   0
Derivative liabilities 0  
Recurring | Level 1 | Mortgage Servicing Rights
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0 0
Recurring | Level 1 | U.S. government agencies
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Government sponsored agencies - Residential mortgage-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Government sponsored agencies - Collateralized mortgage obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Private label collateralized mortgage obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 1 | State and municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 1 | Common and preferred stocks
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 1,133 1,084
Recurring | Level 2 | Interest Rate Swap Agreements
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring | Level 2 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0 0
Recurring | Level 2 | Forward Sales Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets   57
Derivative liabilities (102)  
Recurring | Level 2 | Mortgage Servicing Rights
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 0 0
Recurring | Level 2 | U.S. government agencies
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 23,059 23,726
Recurring | Level 2 | Government sponsored agencies - Residential mortgage-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 80,459 65,210
Recurring | Level 2 | Government sponsored agencies - Collateralized mortgage obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 167,065 166,028
Recurring | Level 2 | Private label collateralized mortgage obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 1,149 1,256
Recurring | Level 2 | State and municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 66,607 73,118
Recurring | Level 2 | Common and preferred stocks
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Interest Rate Swap Agreements
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 213 216
Derivative liabilities (213) (216)
Recurring | Level 3 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 577 130
Recurring | Level 3 | Forward Sales Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets   0
Derivative liabilities 0  
Recurring | Level 3 | Mortgage Servicing Rights
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivative assets 1,889 1,871
Recurring | Level 3 | U.S. government agencies
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Government sponsored agencies - Residential mortgage-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Government sponsored agencies - Collateralized mortgage obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Private label collateralized mortgage obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 3 | State and municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities 0 0
Recurring | Level 3 | Common and preferred stocks
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available-for-sale securities $ 0 $ 0