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Securities (Tables)
 6 Months Ended
Jun. 30, 2014
Securities [Abstract]  
Amortized cost and fair value of securities
The amortized cost and fair value of securities at June 30, 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
 
$
139,938
  
$
429
  
$
(2,490
)
 
$
137,877
 
State and political subdivisions
  
134,394
   
3,607
   
(897
)
  
137,104
 
U.S. government sponsored agency mortgage-backed securities
  
347,790
   
3,643
   
(3,629
)
  
347,804
 
Total debt securities
  
622,122
   
7,679
   
(7,016
)
  
622,785
 
Marketable equity securities
  
25,000
   
0
   
(249
)
  
24,751
 
Total available-for-sale securities
 
$
647,122
  
$
7,679
  
$
(7,265
)
 
$
647,536
 

Held-to-Maturity

(in thousands)
 
Amortized
 Cost
  
Gross
 Unrealized
Gains
  
Gross
Unrealized
 Losses
  
Fair
Value
 
U.S. Treasury and government agencies
 
$
480
  
$
0
  
$
(31
)
 
$
449
 
State and political subdivisions
  
1,182
   
1
   
0
   
1,183
 
Total held-to-maturity securities
 
$
1,662
  
$
1
  
$
(31
)
 
$
1,632
 
 
The amortized cost and fair value of securities as of 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
 
$
65,524
  
$
225
  
$
(5,139
)
 
$
60,610
 
State and political subdivisions
  
118,055
   
1,907
   
(3,259
)
  
116,703
 
U.S. government sponsored agency mortgage-backed securities
  
383,174
   
4,325
   
(8,189
)
  
379,310
 
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 June 30, 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
 
$
3,443
  
$
3,482
  
$
0
  
$
0
 
Due after one through five years
  
106,802
   
107,691
   
0
   
0
 
Due after five through ten years
  
126,757
   
126,150
   
1,182
   
1,183
 
Due after ten years
  
37,330
   
37,658
   
480
   
449
 
U.S. government sponsored agency mortgage-backed securities
  
347,790
   
347,804
   
0
   
0
 
Total debt securities
  
622,122
   
622,785
   
1,662
   
1,632
 
Marketable equity securities
  
25,000
   
24,751
   
0
   
0
 
Total securities
 
$
647,122
  
$
647,536
  
$
1,662
  
$
1,632
 
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, 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
 
$
3,031
  
$
(19
)
 
$
3,012
 
State and political subdivisions
  
4,555
   
(19
)
  
4,536
 
U.S. government sponsored agency mortgage-backed securities
  
88,171
   
(556
)
  
87,615
 
Total debt securities
  
95,757
   
(594
)
  
95,163
 
Marketable equity securities
  
0
   
0
   
0
 
Total <12 months temporarily impaired AFS securities
  
95,757
   
(594
)
  
95,163
 
 
            
12 Months or More
            
U.S. Treasury and government agencies
  
55,519
   
(2,471
)
  
53,048
 
State and political subdivisions
  
31,336
   
(878
)
  
30,458
 
U.S. government sponsored agency mortgage-backed securities
  
99,468
   
(3,073
)
  
96,395
 
Total debt securities
  
186,323
   
(6,422
)
  
179,901
 
Marketable equity securities
  
25,000
   
(249
)
  
24,751
 
Total ≥12 months temporarily impaired AFS securities
  
211,323
   
(6,671
)
  
204,652
 
 
            
Total
            
U.S. Treasury and government agencies
  
58,550
   
(2,490
)
  
56,060
 
State and political subdivisions
  
35,891
   
(897
)
  
34,994
 
U.S. government sponsored agency mortgage-backed securities
  
187,639
   
(3,629
)
  
184,010
 
Total debt securities
  
282,080
   
(7,016
)
  
275,064
 
Marketable equity securities
  
25,000
   
(249
)
  
24,751
 
Total temporarily impaired AFS securities
 
$
307,080
  
$
(7,265
)
 
$
299,815
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
12 Months or More
 
  
  
 
U.S. Treasury and government agencies
 
$
480
  
$
(31
)
 
$
449
 
Total temporarily impaired HTM securities
 
$
480
  
$
(31
)
 
$
449
 

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
 
$
21,750
  
$
(1,617
)
 
$
20,133
 
State and political subdivisions
  
57,165
   
(2,789
)
  
54,376
 
U.S. government sponsored agency mortgage-backed securities
  
248,705
   
(8,182
)
  
240,523
 
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 ≥12 months temporarily impaired AFS securities
  
49,968
   
(3,999
)
  
45,969
 
 
            
Total
            
U.S. Treasury and government agencies
  
57,500
   
(5,139
)
  
52,361
 
State and political subdivisions
  
64,804
   
(3,259
)
  
61,545
 
U.S. government sponsored agency mortgage-backed securities
  
255,284
   
(8,189
)
  
247,095
 
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