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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities $ 510,401   $ 510,401   $ 477,554      
Valuation allowance 9,872 $ 8,714 9,872 $ 8,714 9,610 $ 10,136 $ 8,399 $ 8,308
Provision for credit losses (4,600) 500 (4,850) 500        
Carrying Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 510,401   510,401   477,554      
Loans receivable 621,152   621,152   588,501      
Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 510,401   510,401   477,554      
Loans receivable 627,060   627,060   585,737      
Valuation allowance 263   263   0      
Loans, charge-offs     0 0 0      
Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other real estate owned 0   0          
Assets, fair value 703   703   132      
Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 510,401   510,401   477,554      
U.S. Government agencies | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 57,841   57,841   52,901      
Obligations of states and political subdivisions | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 230,335   230,335   188,268      
U.S. Government agencies collateralized by residential mortgage obligations | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 211,367   211,367   225,259      
Private label residential mortgage backed securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 3,154   3,154   3,590      
Other equity securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 7,704   7,704   7,536      
Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 703   703   132      
Impaired loans | Nonrecurring | Carrying Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 966   966   166      
Valuation allowance 263   263   34      
Impaired loans | Nonrecurring | Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 703   703   132      
Commercial                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 2,972 3,553 2,972 3,553 3,562 3,743 3,129 3,130
Provision for credit losses (4,673) 610 (4,825) 917        
Commercial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 680   680   0      
Real Estate Portfolio Segment                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 5,660 4,429 5,660 4,429 5,204 5,281 4,457 4,058
Provision for credit losses (56) (36) (395) 355        
Consumer                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 948 732 948 732 734 $ 894 $ 765 $ 1,078
Provision for credit losses 55 $ (26) 188 $ (730)        
Consumer | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         132      
Commercial and industrial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 680   680   0      
Equity loans and lines of credit | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 23   23   132      
Level 1                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 7,704   7,704   7,536      
Loans receivable 0   0   0      
Level 1 | Nonrecurring                
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      
Level 1 | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 7,704   7,704   7,536      
Level 1 | U.S. Government agencies | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 1 | Obligations of states and political subdivisions | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 1 | U.S. Government agencies collateralized by residential mortgage obligations | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 1 | Private label residential mortgage backed securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 1 | Other equity securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 7,704   7,704   7,536      
Level 1 | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Level 1 | Commercial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Level 1 | Consumer | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         0      
Level 1 | Commercial and industrial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Level 1 | Equity loans and lines of credit | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
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 502,697   502,697   470,018      
Loans receivable 0   0   0      
Level 2 | Nonrecurring                
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      
Level 2 | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 502,697   502,697   470,018      
Level 2 | U.S. Government agencies | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 57,841   57,841   52,901      
Level 2 | Obligations of states and political subdivisions | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 230,335   230,335   188,268      
Level 2 | U.S. Government agencies collateralized by residential mortgage obligations | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 211,367   211,367   225,259      
Level 2 | Private label residential mortgage backed securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 3,154   3,154   3,590      
Level 2 | Other equity securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 2 | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Level 2 | Commercial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Level 2 | Consumer | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         0      
Level 2 | Commercial and industrial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 0   0   0      
Level 2 | Equity loans and lines of credit | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
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 627,060   627,060   585,737      
Level 3 | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other real estate owned 0   0          
Assets, fair value 703   703   132      
Level 3 | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 0   0   0      
Level 3 | U.S. Government agencies | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 3 | Obligations of states and political subdivisions | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 3 | U.S. Government agencies collateralized by residential mortgage obligations | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 3 | Private label residential mortgage backed securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 3 | Other equity securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 0   0   0      
Level 3 | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 703   703   132      
Level 3 | Commercial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 680   680   0      
Level 3 | Consumer | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         132      
Level 3 | Commercial and industrial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 680   680   0      
Level 3 | Equity loans and lines of credit | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable $ 23   $ 23   $ 132