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Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Securities [Abstract]  
Amortized Cost and Fair Value of Available-for-sale Securities
The amortized cost and fair value of securities at June 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
 
$
249,625
  
$
29
  
$
(2,881
)
 
$
246,773
 
State and political subdivisions
  
129,628
   
875
   
(3,014
)
  
127,489
 
U.S. government sponsored agency mortgage-backed securities
  
217,260
   
194
   
(6,454
)
  
211,000
 
Other debt securities
  
507
   
0
   
(5
)
  
502
 
Total debt securities
  
597,020
   
1,098
   
(12,354
)
  
585,764
 
CRA investment funds
  
0
   
0
   
0
   
0
 
Total available-for-sale securities
 
$
597,020
  
$
1,098
  
$
(12,354
)
 
$
585,764
 
 
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 June 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 June 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
 
$
45,792
  
$
45,586
  
$
0
  
$
0
 
Due after one through five years
  
133,474
   
131,738
   
659
   
660
 
Due after five through ten years
  
66,356
   
65,169
   
0
   
0
 
Due after ten years
  
133,631
   
131,769
   
0
   
0
 
U.S. government sponsored agency mortgage-backed securities
  
217,260
   
211,000
   
0
   
0
 
Other debt securities
  
507
   
502
   
0
   
0
 
Total securities
 
$
597,020
  
$
585,764
  
$
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 June 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 June 30, 2018.

Available-for-Sale

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
Less Than 12 Months
         
U.S. Treasury and government agencies
 
$
170,250
  
$
(2,091
)
 
$
168,159
 
State and political subdivisions
  
55,441
   
(1,492
)
  
53,949
 
U.S. government sponsored agency mortgage-backed securities
  
73,073
   
(1,599
)
  
71,474
 
Other debt securities
  
507
   
(5
)
  
502
 
Total <12 months temporarily impaired AFS securities
  
299,271
   
(5,187
)
  
294,084
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
44,226
   
(790
)
  
43,436
 
State and political subdivisions
  
18,219
   
(1,522
)
  
16,697
 
U.S. government sponsored agency mortgage-backed securities
  
127,030
   
(4,855
)
  
122,175
 
Other debt securities
  
0
   
0
   
0
 
Total ≥12 months temporarily impaired AFS securities
  
189,475
   
(7,167
)
  
182,308
 
             
Total
            
U.S. Treasury and government agencies
  
214,476
   
(2,881
)
  
211,595
 
State and political subdivisions
  
73,660
   
(3,014
)
  
70,646
 
U.S. government sponsored agency mortgage-backed securities
  
200,103
   
(6,454
)
  
193,649
 
Other debt securities
  
507
   
(5
)
  
502
 
Total temporarily impaired AFS securities
 
$
488,746
  
$
(12,354
)
 
$
476,392
 
 
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