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Securities (Tables)
 9 Months Ended
Sep. 30, 2016
Securities [Abstract]  
Amortized Cost and Fair Value of Securities
The amortized cost and fair value of securities at September 30, 2016 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
 
$
243,980
  
$
1,311
  
$
(180
)
 
$
245,111
 
State and political subdivisions
  
128,644
   
4,646
   
(115
)
  
133,175
 
U.S. government sponsored agency mortgage-backed securities
  
226,794
   
1,820
   
(843
)
  
227,771
 
Total debt securities
  
599,418
   
7,777
   
(1,138
)
  
606,057
 
CRA investment funds
  
25,000
   
293
   
(149
)
  
25,144
 
Total available-for-sale securities
 
$
624,418
  
$
8,070
  
$
(1,287
)
 
$
631,201
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
State and political subdivisions
 
$
1,181
  
$
1
  
$
0
  
$
1,182
 
Total held-to-maturity securities
 
$
1,181
  
$
1
  
$
0
  
$
1,182
 

The amortized cost and fair value of securities at December 31, 2015 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
 
$
240,434
  
$
311
  
$
(1,351
)
 
$
239,394
 
State and political subdivisions
  
125,665
   
3,707
   
(157
)
  
129,215
 
U.S. government sponsored agency mortgage-backed securities
  
202,282
   
1,564
   
(2,270
)
  
201,576
 
Total debt securities
  
568,381
   
5,582
   
(3,778
)
  
570,185
 
CRA investment funds
  
25,000
   
132
   
(381
)
  
24,751
 
Total available-for-sale securities
 
$
593,381
  
$
5,714
  
$
(4,159
)
 
$
594,936
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
U.S. Treasury and government agencies
 
$
480
  
$
0
  
$
(12
)
 
$
468
 
State and political subdivisions
  
1,181
   
2
   
0
   
1,183
 
Total held-to-maturity securities
 
$
1,661
  
$
2
  
$
(12
)
 
$
1,651
 
Amortized Cost and Fair Value of Securities by Contractual Maturity
The amortized cost and fair value of securities at September 30, 2016 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
 
$
68,479
  
$
68,576
  
$
0
  
$
0
 
Due after one through five years
  
154,511
   
156,366
   
1,181
   
1,182
 
Due after five through ten years
  
63,044
   
65,336
   
0
   
0
 
Due after ten years
  
86,590
   
88,008
   
0
   
0
 
U.S. government sponsored agency mortgage-backed securities
  
226,794
   
227,771
   
0
   
0
 
Total debt securities
  
599,418
   
606,057
   
1,181
   
1,182
 
CRA investment funds
  
25,000
   
25,144
   
0
   
0
 
Total securities
 
$
624,418
  
$
631,201
  
$
1,181
  
$
1,182
 
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, 2016 that are not deemed to be other-than-temporarily impaired.

Available-for-Sale

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
Less Than 12 Months
         
U.S. Treasury and government agencies
 
$
58,160
  
$
(155
)
 
$
58,005
 
State and political subdivisions
  
10,697
   
(105
)
  
10,592
 
U.S. government sponsored agency mortgage-backed securities
  
109,623
   
(308
)
  
109,315
 
Total debt securities
  
178,480
   
(568
)
  
177,912
 
CRA investment funds
  
10,000
   
(27
)
  
9,973
 
Total <12 months temporarily impaired AFS securities
  
188,480
   
(595
)
  
187,885
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
1,927
   
(25
)
  
1,902
 
State and political subdivisions
  
753
   
(10
)
  
743
 
U.S. government sponsored agency mortgage-backed securities
  
32,712
   
(535
)
  
32,177
 
Total debt securities
  
35,392
   
(570
)
  
34,822
 
CRA investment funds
  
5,000
   
(122
)
  
4,878
 
Total ≥12 months temporarily impaired AFS securities
  
40,392
   
(692
)
  
39,700
 
             
Total
            
U.S. Treasury and government agencies
  
60,087
   
(180
)
  
59,907
 
State and political subdivisions
  
11,450
   
(115
)
  
11,335
 
U.S. government sponsored agency mortgage-backed securities
  
142,335
   
(843
)
  
141,492
 
Total debt securities
  
213,872
   
(1,138
)
  
212,734
 
CRA investment funds
  
15,000
   
(149
)
  
14,851
 
Total temporarily impaired AFS securities
 
$
228,872
  
$
(1,287
)
 
$
227,585
 

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, 2015 that are not deemed to be other-than-temporarily impaired.  The analysis performed as of December 31, 2015 indicated that all impairment was considered temporary, market and interest rate driven, and not credit-related.
 
Available-for-Sale

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
Less Than 12 Months
         
U.S. Treasury and government agencies
 
$
142,147
  
$
(487
)
 
$
141,660
 
State and political subdivisions
  
11,190
   
(106
)
  
11,084
 
U.S. government sponsored agency mortgage-backed securities
  
92,009
   
(899
)
  
91,110
 
Total debt securities
  
245,346
   
(1,492
)
  
243,854
 
CRA investment funds
  
10,000
   
(183
)
  
9,817
 
Total <12 months temporarily impaired AFS securities
  
255,346
   
(1,675
)
  
253,671
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
54,773
   
(864
)
  
53,909
 
State and political subdivisions
  
3,187
   
(51
)
  
3,136
 
U.S. government sponsored agency mortgage-backed securities
  
49,908
   
(1,371
)
  
48,537
 
Total debt securities
  
107,868
   
(2,286
)
  
105,582
 
CRA investment funds
  
5,000
   
(198
)
  
4,802
 
Total ≥12 months temporarily impaired AFS securities
  
112,868
   
(2,484
)
  
110,384
 
             
Total
            
U.S. Treasury and government agencies
  
196,920
   
(1,351
)
  
195,569
 
State and political subdivisions
  
14,377
   
(157
)
  
14,220
 
U.S. government sponsored agency mortgage-backed securities
  
141,917
   
(2,270
)
  
139,647
 
Total debt securities
  
353,214
   
(3,778
)
  
349,436
 
CRA investment funds
  
15,000
   
(381
)
  
14,619
 
Total temporarily impaired AFS securities
 
$
368,214
  
$
(4,159
)
 
$
364,055
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
12 Months or More
         
U.S. Treasury and government agencies
 
$
480
  
$
(12
)
 
$
468
 
Total temporarily impaired HTM securities
 
$
480
  
$
(12
)
 
$
468