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Securities (Tables)
 3 Months Ended
Mar. 31, 2015
Securities [Abstract]  
Amortized cost and fair value of securities
The amortized cost and fair value of securities at March 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
 
$
186,394
  
$
996
  
$
(676
)
 
$
186,714
 
State and political subdivisions
  
132,197
   
4,452
   
(336
)
  
136,313
 
U.S. government sponsored agency mortgage-backed securities
  
275,650
   
3,938
   
(1,400
)
  
278,188
 
Total debt securities
  
594,241
   
9,386
   
(2,412
)
  
601,215
 
CRA investment funds
  
25,000
   
120
   
0
   
25,120
 
Total available-for-sale securities
 
$
619,241
  
$
9,506
  
$
(2,412
)
 
$
626,335
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
U.S. Treasury and government agencies
 
$
480
  
$
0
  
$
(10
)
 
$
470
 
State and political subdivisions
  
1,181
   
2
   
0
   
1,183
 
Total held-to-maturity securities
 
$
1,661
  
$
2
  
$
(10
)
 
$
1,653
 

The amortized cost and fair value of securities as of 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 March 31, 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
 
$
17,748
  
$
17,814
  
$
0
  
$
0
 
Due after one through five years
  
117,110
   
118,395
   
1,181
   
1,183
 
Due after five through ten years
  
135,921
   
137,856
   
480
   
470
 
Due after ten years
  
47,812
   
48,962
   
0
   
0
 
U.S. government sponsored agency mortgage-backed securities
  
275,650
   
278,188
   
0
   
0
 
Total debt securities
  
594,241
   
601,215
   
1,661
   
1,653
 
CRA investment funds
  
25,000
   
25,120
   
0
   
0
 
Total securities
 
$
619,241
  
$
626,335
  
$
1,661
  
$
1,653
 
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 March 31, 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
 
$
9,421
  
$
(14
)
 
$
9,407
 
State and political subdivisions
  
7,094
   
(50
)
  
7,044
 
U.S. government sponsored agency mortgage-backed securities
  
23,865
   
(70
)
  
23,795
 
Total debt securities
  
40,380
   
(134
)
  
40,246
 
CRA investment funds
  
0
   
0
   
0
 
Total <12 months temporarily impaired AFS securities
  
40,380
   
(134
)
  
40,246
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
54,771
   
(662
)
  
54,109
 
State and political subdivisions
  
7,828
   
(286
)
  
7,542
 
U.S. government sponsored agency mortgage-backed securities
  
65,835
   
(1,330
)
  
64,505
 
Total debt securities
  
128,434
   
(2,278
)
  
126,156
 
CRA investment funds
  
0
   
0
   
0
 
Total ≥12 months temporarily impaired AFS securities
  
128,434
   
(2,278
)
  
126,156
 
             
Total
            
U.S. Treasury and government agencies
  
64,192
   
(676
)
  
63,516
 
State and political subdivisions
  
14,922
   
(336
)
  
14,586
 
U.S. government sponsored agency mortgage-backed securities
  
89,700
   
(1,400
)
  
88,300
 
Total debt securities
  
168,814
   
(2,412
)
  
166,402
 
CRA investment funds
  
0
   
0
   
0
 
Total temporarily impaired AFS securities
 
$
168,814
  
$
(2,412
)
 
$
166,402
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Losses
  
Fair Value
 
12 Months or More
      
U.S. Treasury and government agencies
 
$
480
  
$
(10
)
 
$
470
 
Total temporarily impaired HTM securities
 
$
480
  
$
(10
)
 
$
470
 

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