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Investments (Tables)
 6 Months Ended
Jun. 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 June 30, 2017  
          Gross     Gross        
    Amortized     unrealized     unrealized     Estimated  
    cost     gains     losses     fair value  
                         
U. S. treasury securities   $ 4,993     $ 24     $ (1 )   $ 5,016  
U. S. federal agency obligations     21,377       45       (40 )     21,382  
Municipal obligations, tax exempt     177,419       2,485       (661 )     179,243  
Municipal obligations, taxable     62,031       828       (81 )     62,778  
Agency mortgage-backed securities     112,095       368       (623 )     111,840  
Certificates of deposit     9,224       -       -       9,224  
Common stocks     178       181       -       359  
Total   $ 387,317     $ 3,931     $ (1,406 )   $ 389,842  

 

(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 June 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. treasury securities     1     $ 2,994     $ (1 )   $ -     $ -     $ 2,994     $ (1 )
U.S. federal agency obligations     12       14,825       (36 )     995       (4 )     15,820       (40 )
Municipal obligations, tax exempt     113       41,363       (566 )     4,587       (95 )     45,950       (661 )
Municipal obligations, taxable     40       15,167       (81 )     -       -       15,167       (81 )
Agency mortgage-backed securities     38       54,970       (593 )     1,320       (30 )     56,290       (623 )
Total     204     $ 129,319     $ (1,277 )   $ 6,902     $ (129 )   $ 136,221     $ (1,406 )

 

(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

(Dollars in thousands)   Amortized     Estimated  
    cost     fair value  
Due in less than one year   $ 30,111     $ 30,139  
Due after one year but within five years     182,277       182,573  
Due after five years but within ten years     90,785       92,095  
Due after ten years     83,966       84,676  
Common stocks     178       359  
Total   $ 387,317     $ 389,842  
Schedule of Realized Gain (Loss)

Sales proceeds and gross realized gains and losses on sales of available-for-sale securities are as follows:

 

(Dollars in thousands)   Three months ended June 30,     Six months ended June 30,  
    2017     2016     2017     2016  
                         
Sales proceeds   $ 1,917     $ 11,801     $ 13,459     $ 13,617  
                                 
Realized gains   $ 177     $ 296     $ 348     $ 312  
Realized losses     -       (11 )     (24 )     (15 )
Net realized losses   $ 177     $ 285     $ 324     $ 297