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Fair Value Measurements - Recurring and Nonrecurring (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities $ 422,073,000   $ 443,224,000  
Valuation allowance 8,321,000 9,489,000 9,208,000 10,133,000
Provision for credit losses 0 0    
Carrying Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 422,073,000   443,224,000  
Loans receivable 506,100,000   503,149,000  
Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 7,548,000   7,514,000  
Loans receivable 0   0  
Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 414,525,000   435,710,000  
Loans receivable 0   0  
Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
Loans receivable 509,380,000   507,361,000  
Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 422,073,000   443,224,000  
Loans receivable 509,380,000   507,361,000  
Nonrecurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 0   0  
Nonrecurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 0   0  
Nonrecurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 345,000   133,000  
Nonrecurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 345,000   133,000  
Recurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 7,548,000   7,514,000  
Recurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 414,525,000   435,710,000  
Recurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 0   0  
Recurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 422,073,000   443,224,000  
U.S. Government agencies | Recurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
U.S. Government agencies | Recurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 17,975,000   18,203,000  
U.S. Government agencies | Recurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
U.S. Government agencies | Recurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 17,975,000   18,203,000  
Obligations of states and political subdivisions | Recurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
Obligations of states and political subdivisions | Recurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 124,514,000   158,407,000  
Obligations of states and political subdivisions | Recurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
Obligations of states and political subdivisions | Recurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 124,514,000   158,407,000  
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 266,825,000   253,709,000  
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 266,825,000   253,709,000  
Private label residential mortgage backed securities | Recurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
Private label residential mortgage backed securities | Recurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 5,211,000   5,391,000  
Private label residential mortgage backed securities | Recurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
Private label residential mortgage backed securities | Recurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 5,211,000   5,391,000  
Other equity securities | Recurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 7,548,000   7,514,000  
Other equity securities | Recurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
Other equity securities | Recurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 0   0  
Other equity securities | Recurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investment securities 7,548,000   7,514,000  
Impaired loans | Nonrecurring | Carrying Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 375,000   194,000  
Valuation allowance 30,000   61,000  
Impaired loans | Nonrecurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 0      
Impaired loans | Nonrecurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 0      
Impaired loans | Nonrecurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 345,000      
Impaired loans | Nonrecurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 345,000   133,000  
Commercial
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Valuation allowance 2,012,000 2,261,000 2,444,000 2,676,000
Real Estate Portfolio Segment
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Valuation allowance 4,672,000 5,536,000 5,174,000 5,877,000
Consumer
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Valuation allowance 1,391,000 1,315,000 1,168,000 1,541,000
Commercial and industrial | Impaired loans | Nonrecurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 0      
Commercial and industrial | Impaired loans | Nonrecurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 0      
Commercial and industrial | Impaired loans | Nonrecurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 200,000      
Commercial and industrial | Impaired loans | Nonrecurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 200,000      
Equity loans and lines of credit | Impaired loans | Nonrecurring | Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 0   0  
Equity loans and lines of credit | Impaired loans | Nonrecurring | Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 0   0  
Equity loans and lines of credit | Impaired loans | Nonrecurring | Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable 145,000   133,000  
Equity loans and lines of credit | Impaired loans | Nonrecurring | Fair Value
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans receivable $ 145,000   $ 133,000