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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities $ 452,842   $ 452,842   $ 432,535      
Valuation allowance 9,093 $ 7,489 9,093 $ 7,489 8,308 $ 8,714 $ 7,307 $ 9,208
Provision for credit losses 100 0 600 (400)        
Carrying Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 452,842   452,842   432,535      
Loans receivable 590,197   590,197   564,280      
Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 7,641   7,641   7,585      
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 445,201   445,201   424,950      
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 587,752   587,752   564,667      
Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 452,842   452,842   432,535      
Loans receivable 587,752   587,752   564,667      
Valuation allowance         3,921      
Loans, recoveries   131            
Loans, charge-offs 0   0 177 3,539      
Nonrecurring | Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other real estate owned 0   0          
Assets, fair value 0   0   0      
Nonrecurring | Level 2                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other real estate owned 0   0          
Assets, fair value 0   0   0      
Nonrecurring | Level 3                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other real estate owned 0   0          
Assets, fair value 151   151   7,796      
Nonrecurring | Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other real estate owned 0   0          
Assets, fair value 151   151   7,796      
Recurring | Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 7,641   7,641   7,585      
Recurring | Level 2                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 445,201   445,201   424,950      
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 452,842   452,842   432,535      
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 51,914   51,914   33,090      
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 51,914   51,914   33,090      
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 178,999   178,999   149,295      
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 178,999   178,999   149,295      
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 210,543   210,543   237,872      
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 210,543   210,543   237,872      
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 3,745   3,745   4,693      
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 3,745   3,745   4,693      
Other equity securities | Recurring | Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 7,641   7,641   7,585      
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 7,641   7,641   7,585      
Impaired loans | Nonrecurring | Carrying Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 184   184   8,239      
Valuation allowance 33   33   443      
Impaired loans | Nonrecurring | Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Impaired loans | Nonrecurring | Level 2                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Impaired loans | Nonrecurring | Level 3                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 151   151   7,796      
Impaired loans | Nonrecurring | Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 151   151   7,796      
Commercial                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 3,623 2,157 3,623 2,157 3,130 3,553 1,874 2,444
Provision for credit losses (186) 243 731 768        
Commercial | Impaired loans | Nonrecurring | Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Commercial | Impaired loans | Nonrecurring | Level 2                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Commercial | Impaired loans | Nonrecurring | Level 3                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 9   9   7,019      
Commercial | Impaired loans | Nonrecurring | Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 9   9   7,019      
Real Estate Portfolio Segment                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 4,591 4,195 4,591 4,195 4,058 4,429 4,157 5,174
Provision for credit losses 154 (121) 509 (970)        
Consumer                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 774 879 774 879 1,078 $ 732 $ 981 $ 1,168
Provision for credit losses 27 $ (85) (703) $ (34)        
Consumer | Impaired loans | Nonrecurring | Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         0      
Consumer | Impaired loans | Nonrecurring | Level 2                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         0      
Consumer | Impaired loans | Nonrecurring | Level 3                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         777      
Consumer | Impaired loans | Nonrecurring | Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         777      
Commercial and industrial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 9   9          
Commercial and industrial | Impaired loans | Nonrecurring | Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   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   0   0      
Commercial and industrial | Impaired loans | Nonrecurring | Level 3                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 9   9   7,019      
Commercial and industrial | Impaired loans | Nonrecurring | Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         7,019      
Equity loans and lines of credit | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 142   142          
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 $ 142   $ 142   777      
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         $ 777