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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities $ 551,075   $ 551,075   $ 477,554      
Valuation allowance 9,299 $ 9,093 9,299 $ 9,093 9,610 $ 9,872 $ 8,714 $ 8,308
Provision for credit losses (1,000) 100 (5,850) 600        
Carrying Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 551,075   551,075   477,554      
Loans receivable 620,528   620,528   588,501      
Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 551,075   551,075   477,554      
Loans receivable 625,587   625,587   585,737      
Valuation allowance 35   35   0      
Loans, charge-offs     0 0 0      
Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other assets 363   363          
Assets, fair value 386   386   132      
Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Assets, fair value 551,075   551,075   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 48,266   48,266   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 242,208   242,208   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 249,966   249,966   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 2,959   2,959   3,590      
Other equity securities | Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Available-for-sale investment securities 7,676   7,676   7,536      
Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 23   23   132      
Impaired loans | Nonrecurring | Carrying Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 58   58   166      
Valuation allowance 35   35   34      
Impaired loans | Nonrecurring | Fair Value                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable 23   23   132      
Commercial                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 2,318 3,623 2,318 3,623 3,562 2,972 3,553 3,130
Provision for credit losses (963) (186) (5,787) 731        
Commercial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         0      
Real Estate Portfolio Segment                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 6,050 4,591 6,050 4,591 5,204 5,660 4,429 4,058
Provision for credit losses 259 154 (136) 509        
Consumer                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Valuation allowance 912 774 912 774 734 $ 948 $ 732 $ 1,078
Provision for credit losses (23) $ 27 164 $ (703)        
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         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 7,676   7,676   7,536      
Loans receivable 0   0   0      
Level 1 | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other assets 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 7,676   7,676   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 7,676   7,676   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      
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      
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 543,399   543,399   470,018      
Loans receivable 0   0   0      
Level 2 | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other assets 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 543,399   543,399   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 48,266   48,266   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 242,208   242,208   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 249,966   249,966   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 2,959   2,959   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      
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      
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 625,587   625,587   585,737      
Level 3 | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Other assets 363   363          
Assets, fair value 386   386   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 23   23   132      
Level 3 | Commercial | Impaired loans | Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loans receivable         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         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