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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2018
Investment Securities [Abstract]  
Amortized Cost, Unrealized Gains and Losses and Estimated Fair Values of Investments in Debt Securities
The amortized cost, unrealized gains and losses and estimated fair values of investments in debt and other securities at December 31, 2018 are summarized as follows:

 
 
Amortized cost
  
Unrealized gains
  
Unrealized losses
  
Estimated fair value
 
Investment securities available-for-sale:
            
U.S. Treasury securities
 
$
50,825
  
$
14
  
$
(157
)
 
$
50,682
 
Securities of U.S. government agencies and corporations
  
42,215
   
89
   
(228
)
  
42,076
 
Obligations of states and political subdivisions
  
19,110
   
181
   
(123
)
  
19,168
 
Collateralized mortgage obligations
  
65,615
   
34
   
(1,850
)
  
63,799
 
Mortgage-backed securities
  
142,297
   
147
   
(3,532
)
  
138,912
 
 
                
Total debt securities
 
$
320,062
  
$
465
  
$
(5,890
)
 
$
314,637
 

The amortized cost, unrealized gains and losses and estimated fair values of investments in debt and other securities at December 31, 2017 are summarized as follows:

 
 
Amortized cost
  
Unrealized gains
  
Unrealized losses
  
Estimated fair value
 
Investment securities available-for-sale:
            
U.S. Treasury Securities
 
$
18,589
  
$
—
  
$
(125
)
 
$
18,464
 
Securities of U.S. government agencies and corporations
  
21,353
   
—
   
(244
)
  
21,109
 
Obligations of states and political subdivisions
  
23,138
   
216
   
(146
)
  
23,208
 
Collateralized mortgage obligations
  
67,724
   
—
   
(1,641
)
  
66,083
 
Mortgage-backed securities
  
154,143
   
95
   
(2,361
)
  
151,877
 
 
                
Total debt securities
 
$
284,947
  
$
311
  
$
(4,517
)
 
$
280,741
 
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual and Expected Maturity
The amortized cost and estimated fair value of debt and other securities at December 31, 2018, by contractual and expected maturity, are shown in the following table:

  
Amortized
cost
  
Estimated
fair value
 
 
      
Maturity in years:
      
Due in one year or less
 
$
47,277
  
$
47,114
 
Due after one year through five years
  
58,881
   
58,648
 
Due after five years through ten years
  
5,462
   
5,628
 
Due after ten years
  
530
   
536
 
Subtotal 
  
112,150
   
111,926
 
MBS and CMO
  
207,912
   
202,711
 
Total
 
$
320,062
  
$
314,637
 
Analysis of Gross Unrealized Losses of the Available-for-sale Investment Securities Portfolio
An analysis of gross unrealized losses of the available-for-sale investment securities portfolio as of December 31, 2018, follows:

 
 
Less than 12 months
  
12 months or more
  
Total
 
 
 
Fair Value
  
Unrealized losses
  
Fair Value
  
Unrealized losses
  
Fair Value
  
Unrealized losses
 
U.S. Treasury securities
 
$
37,805
  
$
(67
)
 
$
5,951
  
$
(90
)
 
$
43,756
  
$
(157
)
Securities of U.S. government agencies and corporations
  
16,959
   
(39
)
  
13,540
   
(189
)
  
30,499
   
(228
)
Obligations of states and political subdivisions
  
847
   
(2
)
  
9,134
   
(121
)
  
9,981
   
(123
)
Collateralized mortgage obligations
  
2,217
   
(6
)
  
53,217
   
(1,844
)
  
55,434
   
(1,850
)
Mortgage-backed securities
  
16,358
   
(123
)
  
105,361
   
(3,409
)
  
121,719
   
(3,532
)
 
                        
Total
 
$
74,186
  
$
(237
)
 
$
187,203
  
$
(5,653
)
 
$
261,389
  
$
(5,890
)
An analysis of gross unrealized losses of the available-for-sale investment securities portfolio as of December 31, 2017, follows:

 
 
Less than 12 months
  
12 months or more
  
Total
 
 
 
Fair Value
  
Unrealized losses
  
Fair Value
  
Unrealized losses
  
Fair Value
  
Unrealized losses
 
U.S. Treasury Securities
 
$
10,004
  
$
(2
)
 
$
8,460
  
$
(123
)
 
$
18,464
  
$
(125
)
Securities of U.S. government agencies and corporation
  
6,049
   
(50
)
  
15,060
   
(194
)
  
21,109
   
(244
)
Obligations of states and political subdivision
  
7,677
   
(34
)
  
7,116
   
(112
)
  
14,793
   
(146
)
Collateralized mortgage obligations
  
31,679
   
(576
)
  
34,404
   
(1,065
)
  
66,083
   
(1,641
)
Mortgage-backed securities
  
62,320
   
(650
)
  
76,478
   
(1,711
)
  
138,798
   
(2,361
)
 
                        
Total
 
$
117,729
  
$
(1,312
)
 
$
141,518
  
$
(3,205
)
 
$
259,247
  
$
(4,517
)