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Securities (Tables)
 6 Months Ended
Jun. 30, 2015
Securities [Abstract]  
Amortized Cost and Fair Value of Securities
The amortized cost and fair value of securities at June 30, 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
 
$
182,465
  
$
587
  
$
(1,338
)
 
$
181,714
 
State and political subdivisions
  
133,031
   
2,913
   
(783
)
  
135,161
 
U.S. government sponsored agency mortgage-backed securities
  
239,017
   
2,529
   
(1,982
)
  
239,564
 
Total debt securities
  
554,513
   
6,029
   
(4,103
)
  
556,439
 
CRA investment funds
  
25,000
   
0
   
(203
)
  
24,797
 
Total available-for-sale securities
 
$
579,513
  
$
6,029
  
$
(4,306
)
 
$
581,236
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
U.S. Treasury and government agencies
 
$
480
  
$
0
  
$
(22
)
 
$
458
 
State and political subdivisions
  
1,181
   
2
   
0
   
1,183
 
Total held-to-maturity securities
 
$
1,661
  
$
2
  
$
(22
)
 
$
1,641
 

The amortized cost and fair value of securities at December 31, 2014 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
 
$
190,563
  
$
509
  
$
(2,140
)
 
$
188,932
 
State and political subdivisions
  
133,951
   
3,973
   
(466
)
  
137,458
 
U.S. government sponsored agency mortgage-backed securities
  
288,881
   
2,876
   
(2,850
)
  
288,907
 
Total debt securities
  
613,395
   
7,358
   
(5,456
)
  
615,297
 
CRA investment funds
  
25,000
   
0
   
(111
)
  
24,889
 
Total available-for-sale securities
 
$
638,395
  
$
7,358
  
$
(5,567
)
 
$
640,186
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
U.S. Treasury and government agencies
 
$
480
  
$
0
  
$
(19
)
 
$
461
 
State and political subdivisions
  
1,182
   
1
   
0
   
1,183
 
Total held-to-maturity securities
 
$
1,662
  
$
1
  
$
(19
)
 
$
1,644
 
Amortized Cost and Fair Value of Securities by Contractual Maturity
The amortized cost and fair value of securities at June 30, 2015 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
 
$
22,117
  
$
22,209
  
$
0
  
$
0
 
Due after one through five years
  
114,754
   
115,899
   
1,181
   
1,183
 
Due after five through ten years
  
127,998
   
127,897
   
480
   
458
 
Due after ten years
  
50,627
   
50,870
   
0
   
0
 
U.S. government sponsored agency mortgage-backed securities
  
239,017
   
239,564
   
0
   
0
 
Total debt securities
  
554,513
   
556,439
   
1,661
   
1,641
 
CRA investment funds
  
25,000
   
24,797
   
0
   
0
 
Total securities
 
$
579,513
  
$
581,236
  
$
1,661
  
$
1,641
 
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, 2015 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
 
$
27,878
  
$
(81
)
 
$
27,797
 
State and political subdivisions
  
31,676
   
(501
)
  
31,175
 
U.S. government sponsored agency mortgage-backed securities
  
54,031
   
(642
)
  
53,389
 
Total debt securities
  
113,585
   
(1,224
)
  
112,361
 
CRA investment funds
  
25,000
   
(203
)
  
24,797
 
Total <12 months temporarily impaired AFS securities
  
138,585
   
(1,427
)
  
137,158
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
54,772
   
(1,257
)
  
53,515
 
State and political subdivisions
  
7,316
   
(282
)
  
7,034
 
U.S. government sponsored agency mortgage-backed securities
  
57,395
   
(1,340
)
  
56,055
 
Total debt securities
  
119,483
   
(2,879
)
  
116,604
 
CRA investment funds
  
0
   
0
   
0
 
Total ≥12 months temporarily impaired AFS securities
  
119,483
   
(2,879
)
  
116,604
 
             
Total
            
U.S. Treasury and government agencies
  
82,650
   
(1,338
)
  
81,312
 
State and political subdivisions
  
38,992
   
(783
)
  
38,209
 
U.S. government sponsored agency mortgage-backed securities
  
111,426
   
(1,982
)
  
109,444
 
Total debt securities
  
233,068
   
(4,103
)
  
228,965
 
CRA investment funds
  
25,000
   
(203
)
  
24,797
 
Total temporarily impaired AFS securities
 
$
258,068
  
$
(4,306
)
 
$
253,762
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
12 Months or More
      
U.S. Treasury and government agencies
 
$
480
  
$
(22
)
 
$
458
 
Total temporarily impaired HTM securities
 
$
480
  
$
(22
)
 
$
458
 

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, 2014 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
 
$
31,185
  
$
(87
)
 
$
31,098
 
State and political subdivisions
  
8,800
   
(23
)
  
8,777
 
U.S. government sponsored agency mortgage-backed securities
  
50,115
   
(442
)
  
49,673
 
Total debt securities
  
90,100
   
(552
)
  
89,548
 
CRA investment funds
  
25,000
   
(111
)
  
24,889
 
Total <12 months temporarily impaired AFS securities
  
115,100
   
(663
)
  
114,437
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
65,209
   
(2,053
)
  
63,156
 
State and political subdivisions
  
21,308
   
(443
)
  
20,865
 
U.S. government sponsored agency mortgage-backed securities
  
86,389
   
(2,408
)
  
83,981
 
Total debt securities
  
172,906
   
(4,904
)
  
168,002
 
CRA investment funds
  
0
   
0
   
0
 
Total ≥12 months temporarily impaired AFS securities
  
172,906
   
(4,904
)
  
168,002
 
             
Total
            
U.S. Treasury and government agencies
  
96,394
   
(2,140
)
  
94,254
 
State and political subdivisions
  
30,108
   
(466
)
  
29,642
 
U.S. government sponsored agency mortgage-backed securities
  
136,504
   
(2,850
)
  
133,654
 
Total debt securities
  
263,006
   
(5,456
)
  
257,550
 
CRA investment funds
  
25,000
   
(111
)
  
24,889
 
Total temporarily impaired AFS securities
 
$
288,006
  
$
(5,567
)
 
$
282,439
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
12 Months or More
      
U.S. Treasury and government agencies
 
$
480
  
$
(19
)
 
$
461
 
Total temporarily impaired HTM securities
 
$
480
  
$
(19
)
 
$
461