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Investments (Tables)
 9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities

A summary of investment securities available-for-sale is as follows:

 

(Dollars in thousands)   As of September 30, 2017  
          Gross     Gross        
    Amortized     unrealized     unrealized     Estimated  
    cost     gains     losses     fair value  
                         
U. S. treasury securities   $ 4,997     $ 17     $ -     $ 5,014  
U. S. federal agency obligations     20,354       29       (40 )     20,343  
Municipal obligations, tax exempt     179,116       2,236       (781 )     180,571  
Municipal obligations, taxable     59,610       636       (92 )     60,154  
Agency mortgage-backed securities     114,412       197       (850 )     113,759  
Certificates of deposit     9,224       -       -       9,224  
Common stocks     162       161       -       323  
Total   $ 387,875     $ 3,276     $ (1,763 )   $ 389,388  

 

(Dollars in thousands)   As of December 31, 2016  
          Gross     Gross        
    Amortized     unrealized     unrealized     Estimated  
    cost     gains     losses     fair value  
                         
U. S. treasury securities   $ 6,005     $ 10     $ -     $ 6,015  
U. S. federal agency obligations     27,140       48       (49 )     27,139  
Municipal obligations, tax exempt     163,632       696       (2,666 )     161,662  
Municipal obligations, taxable     71,371       463       (271 )     71,563  
Agency mortgage-backed securities     109,427       171       (1,222 )     108,376  
Certificates of deposit     9,700       -       -       9,700  
Common stocks     458       650       -       1,108  
Total   $ 387,733     $ 2,038     $ (4,208 )   $ 385,563  
Schedule of Available for Sale Securities Continuous Unrealized Loss Position Fair Value

(Dollars in thousands)         As of September 30, 2017  
          Less than 12 months     12 months or longer     Total  
    No. of     Fair     Unrealized     Fair     Unrealized     Fair     Unrealized  
    securities     value     losses     value     losses     value     losses  
U.S. federal agency obligations   10     $13,812     $(35)     $995     $(5)     $14,807     $(40)  
Municipal obligations, tax exempt     116       17,851       (141 )     32,217       (640 )     50,068       (781 )
Municipal obligations, taxable     43       14,117       (70 )     1,723       (22 )     15,840       (92 )
Agency mortgage-backed securities     60       78,000       (666 )     7,640       (184 )     85,640       (850 )
Total     229     $ 123,780     $ (912 )   $ 42,575     $ (851 )   $ 166,355     $ (1,763 )

 

(Dollars in thousands)         As of December 31, 2016  
          Less than 12 months     12 months or longer     Total  
    No. of     Fair     Unrealized     Fair     Unrealized     Fair     Unrealized  
    securities     value     losses     value     losses     value     losses  
U. S. federal agency obligations     9       15,056       (49 )     -       -       15,056       (49 )
Municipal obligations, tax exempt     275       97,842       (2,666 )     -       -       97,842       (2,666 )
Municipal obligations, taxable     66       26,184       (271 )     -       -       26,184       (271 )
Agency mortgage-backed securities     58       83,011       (1,222 )     -       -       83,011       (1,222 )
Total     408     $ 222,093     $ (4,208 )   $ -     $ -     $ 222,093     $ (4,208 )
Schedule of Investments Classified by Contractual Maturity Date

    Amortized     Estimated  
(Dollars in thousands)   cost     fair value  
Due in less than one year   $ 28,765     $ 28,794  
Due after one year but within five years     176,397       176,366  
Due after five years but within ten years     97,814       98,668  
Due after ten years     84,737       85,237  
Common stocks     162       323  
Total   $ 387,875     $ 389,388  
Schedule of Realized Gain (Loss)

(Dollars in thousands)   Three months ended September 30,     Nine months ended September 30,  
    2017     2016     2017     2016  
                         
Sales proceeds   $ 54     $ 708     $ 13,513     $ 14,326  
                                 
Realized gains   $ 39     $ 261     $ 387     $ 573  
Realized losses     -       -       (24 )     (15 )
Net realized losses   $ 39     $ 261     $ 363     $ 558