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Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Securities [Abstract]  
Amortized Cost and Fair Value of Available-for-sale Securities
The amortized cost and fair value of securities at September 30, 2018 are summarized as follows:

Available-for-Sale

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
U.S. Treasury and government agencies
 
$
246,153
  
$
0
  
$
(3,354
)
 
$
242,799
 
State and political subdivisions
  
127,423
   
480
   
(3,911
)
  
123,992
 
U.S. government sponsored agency mortgage-backed securities
  
208,900
   
146
   
(7,135
)
  
201,911
 
Other debt securities
  
507
   
0
   
(1
)
  
506
 
Total debt securities
  
582,983
   
626
   
(14,401
)
  
569,208
 
CRA investment funds
  
0
   
0
   
0
   
0
 
Total available-for-sale securities
 
$
582,983
  
$
626
  
$
(14,401
)
 
$
569,208
 

The amortized cost and fair value of securities at December 31, 2017 are summarized as follows:

Available-for-Sale

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
U.S. Treasury and government agencies
 
$
211,574
  
$
170
  
$
(1,172
)
 
$
210,572
 
State and political subdivisions
  
144,159
   
2,017
   
(1,161
)
  
145,015
 
U.S. government sponsored agency mortgage-backed securities
  
208,959
   
357
   
(4,007
)
  
205,309
 
Other debt securities
  
507
   
0
   
0
   
507
 
Total debt securities
  
565,199
   
2,544
   
(6,340
)
  
561,403
 
CRA investment funds
  
25,000
   
76
   
(718
)
  
24,358
 
Total available-for-sale securities
 
$
590,199
  
$
2,620
  
$
(7,058
)
 
$
585,761
 
Amortized Cost and Fair Value of Held-to-maturity Securities
The amortized cost and fair value of securities at September 30, 2018 are summarized as follows:

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
State and political subdivisions
 
$
659
  
$
1
  
$
0
  
$
660
 
Total held-to-maturity securities
 
$
659
  
$
1
  
$
0
  
$
660
 

The amortized cost and fair value of securities at December 31, 2017 are summarized as follows:
Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
State and political subdivisions
 
$
659
  
$
1
  
$
0
  
$
660
 
Total held-to-maturity securities
 
$
659
  
$
1
  
$
0
  
$
660
 
Amortized Cost and Fair Value of Securities by Contractual Maturity
The amortized cost and fair value of securities at September 30, 2018 by contractual maturity are shown below.  Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

  
Available-for-Sale
  
Held-to-Maturity
 
(in thousands)
 
Amortized Cost
  
Fair Value
  
Amortized Cost
  
Fair Value
 
Due in one year or less
 
$
46,660
  
$
46,471
  
$
0
  
$
0
 
Due after one through five years
  
133,244
   
131,223
   
659
   
660
 
Due after five through ten years
  
76,825
   
75,192
   
0
   
0
 
Due after ten years
  
116,847
   
113,905
   
0
   
0
 
U.S. government sponsored agency mortgage-backed securities
  
208,900
   
201,911
   
0
   
0
 
Other debt securities
  
507
   
506
   
0
   
0
 
Total securities
 
$
582,983
  
$
569,208
  
$
659
  
$
660
 
Available for Sale Securities and Held-to-Maturity Securities, Continuous Unrealized Loss Position
The following tables provide the amortized cost, gross unrealized losses, and fair market value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of September 30, 2018 that are not deemed to be other-than-temporarily impaired.  There were no held-to-maturity securities that were deemed to be impaired as of September 30, 2018.

Available-for-Sale

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
Less Than 12 Months
         
U.S. Treasury and government agencies
 
$
132,224
  
$
(1,300
)
 
$
130,924
 
State and political subdivisions
  
59,535
   
(1,511
)
  
58,024
 
U.S. government sponsored agency mortgage-backed securities
  
32,681
   
(674
)
  
32,007
 
Other debt securities
  
507
   
(1
)
  
506
 
Total <12 months temporarily impaired AFS securities
  
224,947
   
(3,486
)
  
221,461
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
113,929
   
(2,054
)
  
111,875
 
State and political subdivisions
  
29,021
   
(2,400
)
  
26,621
 
U.S. government sponsored agency mortgage-backed securities
  
162,034
   
(6,461
)
  
155,573
 
Other debt securities
  
0
   
0
   
0
 
Total ≥12 months temporarily impaired AFS securities
  
304,984
   
(10,915
)
  
294,069
 
             
Total
            
U.S. Treasury and government agencies
  
246,153
   
(3,354
)
  
242,799
 
State and political subdivisions
  
88,556
   
(3,911
)
  
84,645
 
U.S. government sponsored agency mortgage-backed securities
  
194,715
   
(7,135
)
  
187,580
 
Other debt securities
  
507
   
(1
)
  
506
 
Total temporarily impaired AFS securities
 
$
529,931
  
$
(14,401
)
 
$
515,530
 

The following tables provide the amortized cost, gross unrealized losses, and fair market value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of December 31, 2017 that are not deemed to be other-than-temporarily impaired.  There were no held-to-maturity securities that were deemed to be impaired as of December 31, 2017.

Available-for-Sale

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
Less Than 12 Months
         
U.S. Treasury and government agencies
 
$
136,688
  
$
(840
)
 
$
135,848
 
State and political subdivisions
  
34,283
   
(416
)
  
33,867
 
U.S. government sponsored agency mortgage-backed securities
  
62,768
   
(643
)
  
62,125
 
Total debt securities
  
233,739
   
(1,899
)
  
231,840
 
CRA investment funds
  
7,500
   
(105
)
  
7,395
 
Total <12 months temporarily impaired AFS securities
  
241,239
   
(2,004
)
  
239,235
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
23,885
   
(332
)
  
23,553
 
State and political subdivisions
  
16,930
   
(745
)
  
16,185
 
U.S. government sponsored agency mortgage-backed securities
  
117,827
   
(3,364
)
  
114,463
 
Total debt securities
  
158,642
   
(4,441
)
  
154,201
 
CRA investment funds
  
15,000
   
(613
)
  
14,387
 
Total ≥12 months temporarily impaired AFS securities
  
173,642
   
(5,054
)
  
168,588
 
             
Total
            
U.S. Treasury and government agencies
  
160,573
   
(1,172
)
  
159,401
 
State and political subdivisions
  
51,213
   
(1,161
)
  
50,052
 
U.S. government sponsored agency mortgage-backed securities
  
180,595
   
(4,007
)
  
176,588
 
Total debt securities
  
392,381
   
(6,340
)
  
386,041
 
CRA investment funds
  
22,500
   
(718
)
  
21,782
 
Total temporarily impaired AFS securities
 
$
414,881
  
$
(7,058
)
 
$
407,823