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Securities (Tables)
12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost and estimated fair value of investments in securities
The amortized cost and estimated fair value of investments in securities at December 31, 2016 and 2015 were as follows (dollars in thousands):
 
December 31, 2016
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
Securities available for sale:
 
 
 
 
 
 
 
Federal agencies and GSEs
$
106,379

 
$
62

 
$
2,387

 
$
104,054

Mortgage-backed and CMOs
79,917

 
514

 
938

 
79,493

State and municipal
145,757

 
2,540

 
782

 
147,515

Corporate
13,392

 
123

 
23

 
13,492

Equity securities
1,288

 
660

 

 
1,948

Total securities available for sale
$
346,733

 
$
3,899

 
$
4,130

 
$
346,502

 
December 31, 2015
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities available for sale:
 
 
 
 
 
 
 
Federal agencies and GSEs
$
81,601

 
$
170

 
$
319

 
$
81,452

Mortgage-backed and CMOs
70,520

 
799

 
389

 
70,930

State and municipal
170,268

 
5,659

 
36

 
175,891

Corporate
10,619

 
28

 
57

 
10,590

Equity securities
1,000

 
486

 

 
1,486

Total securities available for sale
$
334,008

 
$
7,142

 
$
801

 
$
340,349

Amortized cost and estimated fair value of investments in securities by contractual maturity
The amortized cost and estimated fair value of investments in securities at December 31, 2016, by contractual maturity, are shown in the following table.  Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.  Because mortgage-backed securities have both known principal repayment terms as well as unknown principal repayments due to potential borrower pre-payments, it is difficult to accurately predict the final maturity of these investments.  Mortgage-backed securities are shown separately (dollars in thousands):
 
Available for Sale
 
Amortized
Cost
 
Fair Value
Due in one year or less
$
23,342

 
$
23,422

Due after one year through five years
104,876

 
106,028

Due after five years through ten years
105,944

 
104,973

Due after ten years
31,366

 
30,639

Mortgage-backed and CMOs
79,917

 
79,492

Equity securities
1,288

 
1,948

 
$
346,733

 
$
346,502

Gross realized gains and losses
Gross realized gains and losses from the sale of securities available for sale were as follows (dollars in thousands):
 
For the Years Ended December 31,
 
2016
 
2015
 
2014
Realized gains
$
844

 
$
871

 
$
507

Realized losses
(8
)
 
(4
)
 
(2
)
Other-than-temporary impairment

 

 

Schedule of available for sale securities, continuous unrealized loss position
The table below shows gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities had been in a continuous unrealized loss position, at December 31, 2015 (dollars in thousands):
 
Total
 
Less than 12 Months
 
12 Months or More
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Federal agencies and GSEs
$
57,711

 
$
319

 
$
57,711

 
$
319

 
$

 
$

Mortgage-backed and CMOs
37,368

 
389

 
35,424

 
346

 
1,944

 
43

State and municipal
13,540

 
36

 
12,716

 
34

 
824

 
2

Corporate
5,107

 
57

 
3,530

 
29

 
1,577

 
28

Total
$
113,726

 
$
801

 
$
109,381

 
$
728

 
$
4,345

 
$
73

Available for sale securities that have been in a continuous unrealized loss position are as follows (dollars in thousands):
 
Total
 
Less than 12 Months
 
12 Months or More
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
Federal agencies and GSEs
$
89,597

 
$
2,387

 
$
89,597

 
$
2,387

 
$

 
$

Mortgage-backed and CMOs
57,762

 
938

 
56,076

 
911

 
1,686

 
27

State and municipal
47,221

 
782

 
47,221

 
782

 

 

Corporate
2,895

 
23

 
2,895

 
23

 

 

Total
$
197,475

 
$
4,130

 
$
195,789

 
$
4,103

 
$
1,686

 
$
27