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Fair Value Measurements - Recurring and Nonrecurring (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities $ 441,223,000   $ 441,223,000     $ 443,224,000    
Valuation allowance 7,307,000 9,601,000 7,307,000 9,601,000 8,321,000 9,208,000 9,489,000 10,133,000
Provision for credit losses (400,000) 0 (400,000) 0        
Fair Value
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans, charge-offs 287,000   308,000          
Carrying Value
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 441,223,000   441,223,000     443,224,000    
Loans receivable 537,848,000   537,848,000     503,149,000    
Level 1
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 7,633,000   7,633,000     7,514,000    
Loans receivable 0   0     0    
Level 2
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 433,590,000   433,590,000     435,710,000    
Loans receivable 0   0     0    
Level 3
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0     0    
Loans receivable 540,215,000   540,215,000     507,361,000    
Fair Value
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 441,223,000   441,223,000     443,224,000    
Loans receivable 540,215,000   540,215,000     507,361,000    
Nonrecurring | Level 1
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 0   0     0    
Nonrecurring | Level 2
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 0   0     0    
Nonrecurring | Level 3
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 145,000   145,000     133,000    
Nonrecurring | Fair Value
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 145,000   145,000     133,000    
Recurring | Level 1
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 7,633,000   7,633,000     7,514,000    
Recurring | Level 2
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 433,590,000   433,590,000     435,710,000    
Recurring | Level 3
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 0   0     0    
Recurring | Fair Value
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 441,223,000   441,223,000     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     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 17,336,000   17,336,000     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     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 17,336,000   17,336,000     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     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 137,117,000   137,117,000     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     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 137,117,000   137,117,000     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     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 274,102,000   274,102,000     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     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 274,102,000   274,102,000     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     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 5,035,000   5,035,000     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     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 5,035,000   5,035,000     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 7,633,000   7,633,000     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     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     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 7,633,000   7,633,000     7,514,000    
Impaired loans | Nonrecurring | Carrying Value
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 174,000   174,000     194,000    
Valuation allowance 29,000   29,000     61,000    
Impaired loans | Nonrecurring | Fair Value
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 145,000   145,000     133,000    
Commercial
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 1,874,000 2,792,000 1,874,000 2,792,000 2,012,000 2,444,000 2,261,000 2,676,000
Real Estate Portfolio Segment
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 4,157,000 5,057,000 4,157,000 5,057,000 4,672,000 5,174,000 5,536,000 5,877,000
Consumer
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 981,000 1,252,000 981,000 1,252,000 1,391,000 1,168,000 1,315,000 1,541,000
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     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     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   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   $ 145,000     $ 133,000