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Securities (Tables)
 6 Months Ended
Jun. 30, 2016
Securities [Abstract]  
Amortized Cost and Fair Value of Securities
The amortized cost and fair value of securities at June 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
 
$
219,193
  
$
1,694
  
$
(26
)
 
$
220,861
 
State and political subdivisions
  
117,611
   
5,377
   
(41
)
  
122,947
 
U.S. government sponsored agency mortgage-backed securities
  
207,696
   
2,823
   
(471
)
  
210,048
 
Total debt securities
  
544,500
   
9,894
   
(538
)
  
553,856
 
CRA investment funds
  
25,000
   
358
   
(99
)
  
25,259
 
Total available-for-sale securities
 
$
569,500
  
$
10,252
  
$
(637
)
 
$
579,115
 

Held-to-Maturity

(in thousands)
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
U.S. Treasury and government agencies
 
$
480
  
$
0
  
$
0
  
$
480
 
State and political subdivisions
  
1,181
   
1
   
0
   
1,182
 
Total held-to-maturity securities
 
$
1,661
  
$
1
  
$
0
  
$
1,662
 

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 June 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
 
$
74,264
  
$
74,387
  
$
0
  
$
0
 
Due after one through five years
  
152,755
   
154,945
   
1,181
   
1,182
 
Due after five through ten years
  
67,396
   
70,228
   
480
   
480
 
Due after ten years
  
42,389
   
44,248
   
0
   
0
 
U.S. government sponsored agency mortgage-backed securities
  
207,696
   
210,048
   
0
   
0
 
Total debt securities
  
544,500
   
553,856
   
1,661
   
1,662
 
CRA investment funds
  
25,000
   
25,259
   
0
   
0
 
Total securities
 
$
569,500
  
$
579,115
  
$
1,661
  
$
1,662
 
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, 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
 
$
0
  
$
0
  
$
0
 
State and political subdivisions
  
3,090
   
(34
)
  
3,056
 
U.S. government sponsored agency mortgage-backed securities
  
5,831
   
(18
)
  
5,813
 
Total debt securities
  
8,921
   
(52
)
  
8,869
 
CRA investment funds
  
0
   
0
   
0
 
Total <12 months temporarily impaired AFS securities
  
8,921
   
(52
)
  
8,869
 
             
12 Months or More
            
U.S. Treasury and government agencies
  
21,999
   
(26
)
  
21,973
 
State and political subdivisions
  
754
   
(7
)
  
747
 
U.S. government sponsored agency mortgage-backed securities
  
33,333
   
(453
)
  
32,880
 
Total debt securities
  
56,086
   
(486
)
  
55,600
 
CRA investment funds
  
5,000
   
(99
)
  
4,901
 
Total ≥12 months temporarily impaired AFS securities
  
61,086
   
(585
)
  
60,501
 
             
Total
            
U.S. Treasury and government agencies
  
21,999
   
(26
)
  
21,973
 
State and political subdivisions
  
3,844
   
(41
)
  
3,803
 
U.S. government sponsored agency mortgage-backed securities
  
39,164
   
(471
)
  
38,693
 
Total debt securities
  
65,007
   
(538
)
  
64,469
 
CRA investment funds
  
5,000
   
(99
)
  
4,901
 
Total temporarily impaired AFS securities
 
$
70,007
  
$
(637
)
 
$
69,370
 

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