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Fair Value Measurements and Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

For financial assets and liabilities measured at fair value on a recurring basis, the fair value measurements by level within the fair value hierarchy used at June 30, 2019 and December 31, 2018 are as follows:

June 30, 2019
  Fair Value Measurements at Reporting Date Using  
  Quoted Prices  
  in Active   Significant
  Markets for   Other   Significant  
  Identical   Observable   Unobservable  
  Assets   Inputs   Inputs  
  Total Fair Value   (Level 1)   (Level 2)   (Level 3)  
  (dollars in thousands)      
  Recurring fair value measurements:                        
  Assets
      Investment securities:
Available-for-sale:
  Federal agency obligations   $ 25,461   $ -   $ 25,461   $ -  
  Residential mortgage pass-through securities 229,542 - 229,542 -  
  Commercial mortgage pass-through securities 5,826 - 5,826 -  
  Obligations of U.S. states and political subdivision 144,119 -      134,873 9,246  
  Corporate bonds and notes 28,117 - 28,117 -  
  Asset-backed securities 7,746 - 7,746 -  
  Certificates of deposit 150 - 150 -  
  Other securities 950 950 - -  
  Total available-for-sale   $ 441,911   $ 950   $ 431,715   $ 9,246  
                             
  Equity securities 11,152 11,152 - -  
  Total assets   $ 453,063   $ 12,102   $ 431,715   $ 9,246  
                             
  Liabilities
  Derivatives 128 - 128 -  
  Total liabilities   $ 128   $ -   $ 128   $ -  

December 31, 2018
  Fair Value Measurements at Reporting Date Using  
  Quoted Prices  
  in Active   Significant
  Markets for   Other   Significant  
  Identical   Observable   Unobservable  
  Assets   Inputs   Inputs  
  Total Fair Value   (Level 1)   (Level 2)   (Level 3)  
  (dollars in thousands)            
  Recurring fair value measurements:            
  Assets      
  Investment securities:
      Available-for-sale:
  Federal agency obligations   $ 44,955   $ -   $ 44,955   $ -  
  Residential mortgage pass-through securities 185,204 - 185,204 -  
  Commercial mortgage pass-through securities 3,874 - 3,874 -  
  Obligations of U.S. states and political subdivision 139,185 - 129,808 9,377  
  Corporate bonds and notes 25,813 - 25,813 -  
  Asset-backed securities 9,691 - 9,691 -  
  Certificates of deposit 322 - 322 -  
  Other securities 2,990 2,990 - -  
  Total available-for-sale   $ 412,034   $ 2,990   $ 399,667   $ 9,377  
                             
  Equity securities 11,460 11,460 - -  
  Derivatives 1,159 - 1,159 -  
  Total assets   $ 424,653   $ 14,450   $ 400,826   $ 9,377  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]

For assets measured at fair value on a nonrecurring basis, the fair value measurements at June 30, 2019 and December 31, 2018 are as follows:

          Fair Value Measurements at Reporting Date Using
          Quoted            
          Prices            
          in Active   Significant      
          Markets for   Other    Significant
          Identical   Observable    Unobservable
          Assets   Inputs    Inputs
Assets measured at fair value on a nonrecurring basis:   June 30, 2019   (Level 1)   (Level 2)    (Level 3)
Impaired loans:           (dollars in thousands)
Commercial real estate   $ 364       $                     -   $                     -   $                364
Commercial construction         2,732         -         -         2,732
Residential real estate     231     -     -     231

          Fair Value Measurements at Reporting Date Using
          Quoted            
          Prices            
          in Active     Significant      
          Markets for     Other   Significant
          Identical     Observable   Unobservable
Assets measured at fair value on a nonrecurring basis:   December 31,
2018		   Assets
(Level 1)  		   Inputs
(Level 2)		   Inputs
(Level 3)
Impaired loans:                 (dollars in thousands)
Commercial real estate   $ 1,481   $                     -       $                     -        $                1,481
Residential real estate     231     -     -     231
Fair Value, Recurring basis [Table Text Block]

The tables below present a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the six months ended June 30, 2019 and for the year ended December 31, 2018:

    Municipal
    Securities
    (dollars in thousands)
Beginning balance, January 1, 2019       $      9,377  
Principal paydowns     (131 )
Ending balance, June 30, 2019   $ 9,246  
          
    Municipal
    Securities
    (dollars in thousands)
Beginning balance, January 1, 2018   $ 9,632  
Principal paydowns     (255 )
Ending balance, December 31, 2018   $                       9,377  
Significant unobservable inputs used in fair value measurements [Table Text Block]

The following methods and assumptions were used to estimate the fair values of the Company’s assets measured at fair value on a recurring basis at June 30, 2019 and December 31, 2018. The table below provides quantitative information about significant unobservable inputs used in fair value measurements within Level 3 hierarchy.

June 30, 2019                  
          Valuation   Unobservable    
    Fair Value   Techniques   Input   Range
Securities available-for-sale:                 (dollars in thousands)                
Municipal securities   $      9,246   Discounted cash flows   Discount rate   2.9%
                    
December 31, 2018                  
                    
    Fair Value   Valuation
Techniques		   Unobservable
Input		   Range
Securities available-for-sale:         (dollars in thousands)        
Municipal securities   $ 9,377   Discounted cash flows   Discount rate   2.9%
Fair Value Measurements, Nonrecurring [Table Text Block]

Nonrecurring basis: The following methods and assumptions were used to estimate the fair values of the Company’s assets measured at fair value on a nonrecurring basis for the periods presented. The tables below provide quantitative information about significant unobservable inputs used in fair value measurements within Level 3 hierarchy.

Valuation   Unobservable
June 30, 2019       Fair Value       Techniques       Input       Range
Impaired loans: (dollars in thousands)
Commercial real estate   $ 364   Sales comparison approach   Adjustment for differences between the comparable sales   0% - 20% [10%]
Commercial construction   $ 2,732   Sales comparison approach   Adjustment for differences between the comparable sales   0% - 20% [10%]
Residential real estate   $ 231   Sales comparison approach   Adjustment for differences between the comparable sales   0% - 7% [2%]
         
December 31, 2018 Fair Value Valuation
Techniques		   Unobservable
Input		   Range
Impaired loans: (dollars in thousands)
Commercial real estate   $ 1,481   Sales comparison approach   Adjustment for differences between the comparable sales   6% - 9% [8%]
Residential real estate   $ 231   Sales comparison approach   Adjustment for differences between the comparable sales   0% - 10% [5%]
Fair Value, by Balance Sheet Grouping [Table Text Block]

As of June 30, 2019 the fair value measurements presented are consistent with Topic 820, Fair Value Measurement, in which fair value represents exit price. The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments as of June 30, 2019 and December 31, 2018:

                Fair Value Measurements
                Quoted            
                Prices in            
                Active   Significant      
                Markets for   Other    Significant
                Identical   Observable    Unobservable
    Carrying   Fair   Assets   Inputs    Inputs
        Amount       Value       (Level 1)       (Level 2)        (Level 3)
    (dollars in thousands)
June 30, 2019                              
Financial assets:                              
Cash and due from banks   $       185,650   $       185,650   $       185,650   $       -   $       -
Securities available-for-sale     441,911     441,911     950     431,715     9,246
Investment in restricted stocks     31,767     n/a     n/a     n/a     n/a
Equity securities     11,152     11,152     11,152     -     -
Net loans     5,052,794     5,041,283     -     -     5,041,283
Accrued interest receivable     21,272     21,272     -     2,447     18,825
   
Financial liabilities:                              
Noninterest-bearing deposits     813,635     813,635     813,635     -     -
Interest-bearing deposits     3,827,508     3,839,549     2,203,560     1,635,989     -
Borrowings     597,317     598,821     -     598,821     -
Subordinated debentures     128,720     137,269     -     137,269     -
Derivatives     128     128     -     128     -
Accrued interest payable     5,561     5,561     -     5,561     -
  
December 31, 2018                              
Financial assets:                              
Cash and due from banks   $ 172,366   $ 172,366   $ 172,366   $ -   $ -
Securities available-for-sale     412,034     412,034     2,990     399,667     9,377
Investment in restricted stocks     31,136     n/a     n/a     n/a     n/a
Equity securities     11,460     11,460     11,460     -     -
Net loans     4,506,138     4,402,878     -     -     4,402,878
Derivatives     1,159     1,159     -     1,159     -
Accrued interest receivable     18,214     18,214     -     2,064     16,150
   
Financial liabilities:                              
Noninterest-bearing deposits     768,584     768,584     768,584     -     -
Interest-bearing deposits     3,323,508     3,320,640     1,957,503     1,363,137     -
Borrowings     600,001     598,598     -     598,598     -
Subordinated debentures     128,556     132,426     -     132,426     -
Accrued interest payable     6,764     6,764     -     6,764     -