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Securities (Tables)
 12 Months Ended
Dec. 31, 2014
Securities [Abstract]  
Amortized Cost and Fair Value of Securities
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
 
Marketable equity securities
  
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
 

The amortized cost and fair value of securities at December 31, 2013 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
 
$
77,838
  
$
277
  
$
(5,492
)
 
$
72,623
 
State and political subdivisions
  
118,055
   
1,907
   
(3,259
)
  
116,703
 
U.S. government sponsored agency mortgage-backed securities
  
370,860
   
4,273
   
(7,836
)
  
367,297
 
Total debt securities
  
566,753
   
6,457
   
(16,587
)
  
556,623
 
Marketable equity securities
  
55,000
   
0
   
(2,218
)
  
52,782
 
Total available-for-sale securities
 
$
621,753
  
$
6,457
  
$
(18,805
)
 
$
609,405
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
U.S. Treasury and government agencies
 
$
480
  
$
0
  
$
(62
)
 
$
418
 
State and political subdivisions
  
1,182
   
1
   
0
   
1,183
 
Total held-to-maturity securities
 
$
1,662
  
$
1
  
$
(62
)
 
$
1,601
 
Amortized Cost and Fair Value of Securities by Contractual Maturity
The amortized cost and fair value of securities at December 31, 2014 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
 
$
9,153
  
$
9,193
  
$
0
  
$
0
 
Due after one through five years
  
124,725
   
125,444
   
0
   
0
 
Due after five through ten years
  
141,407
   
141,625
   
1,662
   
1,644
 
Due after ten years
  
49,229
   
50,128
   
0
   
0
 
U.S. government sponsored agency mortgage-backed securities
  
288,881
   
288,907
   
0
   
0
 
Total debt securities
  
613,395
   
615,297
   
1,662
   
1,644
 
Marketable equity securities
  
25,000
   
24,889
   
0
   
0
 
Total securities
 
$
638,395
  
$
640,186
  
$
1,662
  
$
1,644
 
Amortized Cost, Gross Unrealized Losses, and Fair Market Value of Securities in 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 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
 
Marketable equity securities
  
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
 
Marketable equity securities
  
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
 
Marketable equity securities
  
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
 

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, 2013 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
 
$
31,631
  
$
(1,970
)
 
$
29,661
 
State and political subdivisions
  
57,165
   
(2,789
)
  
54,376
 
U.S. government sponsored agency mortgage-backed securities
  
238,824
   
(7,829
)
  
230,995
 
Total debt securities
  
327,620
   
(12,588
)
  
315,032
 
Marketable equity securities
  
55,000
   
(2,218
)
  
52,782
 
Total <12 months temporarily impaired AFS securities
  
382,620
   
(14,806
)
  
367,814
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
35,750
   
(3,522
)
  
32,228
 
State and political subdivisions
  
7,639
   
(470
)
  
7,169
 
U.S. government sponsored agency mortgage-backed securities
  
6,579
   
(7
)
  
6,572
 
Total debt securities
  
49,968
   
(3,999
)
  
45,969
 
Marketable equity securities
  
0
   
0
   
0
 
Total ≥12 months temporarily impaired AFS securities
  
49,968
   
(3,999
)
  
45,969
 
             
Total
            
U.S. Treasury and government agencies
  
67,381
   
(5,492
)
  
61,889
 
State and political subdivisions
  
64,804
   
(3,259
)
  
61,545
 
U.S. government sponsored agency mortgage-backed securities
  
245,403
   
(7,836
)
  
237,567
 
Total debt securities
  
377,588
   
(16,587
)
  
361,001
 
Marketable equity securities
  
55,000
   
(2,218
)
  
52,782
 
Total temporarily impaired AFS securities
 
$
432,588
  
$
(18,805
)
 
$
413,783
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
12 Months or More
      
U.S. Treasury and government agencies
 
$
480
  
$
(62
)
 
$
418
 
Total temporarily impaired HTM securities
 
$
480
  
$
(62
)
 
$
418