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Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Securities [Abstract]  
Amortized Cost, Estimated Fair Value, and Unrealized Gains and Losses of Securities Available for Sale
The amortized cost, estimated fair value and unrealized gains (losses) of available for sale (“AFS”) securities are as follows:
 
(In thousands)
 
Amortized
Cost
  
Unrealized
Gains
  
Unrealized
Losses
  
Estimated
Fair Value
 
September 30, 2018
            
Federal agency
 
$
84,974
  
$
-
  
$
1,712
  
$
83,262
 
State & municipal
  
36,841
   
13
   
387
   
36,467
 
Mortgage-backed:
                
Government-sponsored enterprises
  
479,852
   
207
   
16,171
   
463,888
 
U.S. government agency securities
  
29,422
   
204
   
1,106
   
28,520
 
Collateralized mortgage obligations:
                
Government-sponsored enterprises
  
461,148
   
222
   
19,860
   
441,510
 
U.S. government agency securities
  
49,208
   
115
   
1,896
   
47,427
 
Total AFS securities
 
$
1,141,445
  
$
761
  
$
41,132
  
$
1,101,074
 
December 31, 2017
                
Federal agency
 
$
109,862
  
$
-
  
$
963
  
$
108,899
 
State & municipal
  
42,171
   
62
   
277
   
41,956
 
Mortgage-backed:
                
Government-sponsored enterprises
  
530,392
   
1,406
   
3,345
   
528,453
 
U.S. government agency securities
  
26,363
   
334
   
223
   
26,474
 
Collateralized mortgage obligations:
                
Government-sponsored enterprises
  
496,033
   
254
   
10,114
   
486,173
 
U.S. government agency securities
  
50,721
   
165
   
1,065
   
49,821
 
Equity securities
  
10,623
   
3,672
   
146
   
14,149
 
Total AFS securities
 
$
1,266,165
  
$
5,893
  
$
16,133
  
$
1,255,925
 
Amortized Cost, Estimated Fair Value, and Unrealized Gains and Losses of Securities Held to Maturity
The amortized cost, estimated fair value and unrealized gains (losses) of held to maturity (“HTM”) securities are as follows:

(In thousands)
 
Amortized
Cost
  
Unrealized
Gains
  
Unrealized
Losses
  
Estimated
Fair Value
 
September 30, 2018
            
Federal agency
 
$
9,995
  
$
-
  
$
46
  
$
9,949
 
Mortgage-backed:
                
     Government-sponsored enterprises
  
87,743
   
-
   
4,075
   
83,668
 
     U.S. government agency securities
  
15,241
   
36
   
69
   
15,208
 
Collateralized mortgage obligations:
                
     Government-sponsored enterprises
  
268,044
   
31
   
7,080
   
260,995
 
     U.S. government agency securities
  
29,401
   
4
   
67
   
29,338
 
State & municipal
  
249,525
   
90
   
3,041
   
246,574
 
Total HTM securities
 
$
659,949
  
$
161
  
$
14,378
  
$
645,732
 
December 31, 2017
                
Mortgage-backed:
                
     Government-sponsored enterprises
 
$
96,357
  
$
85
  
$
810
  
$
95,632
 
     U.S. government agency securities
  
418
   
57
   
-
   
475
 
Collateralized mortgage obligations:
                
     Government-sponsored enterprises
  
186,327
   
224
   
2,577
   
183,974
 
State & municipal
  
200,971
   
1,439
   
620
   
201,790
 
Total HTM securities
 
$
484,073
  
$
1,805
  
$
4,007
  
$
481,871
 
Investment Securities with Unrealized Losses
The following table sets forth information with regard to investment securities with unrealized losses segregated according to the length of time the securities had been in a continuous unrealized loss position:
 
  
Less than 12 months
  
12 months or longer
  
Total
 
(In thousands)
 
Fair
Value
  
Unrealized
Losses
  
Number
of
Positions
  
Fair
Value
  
Unrealized
Losses
  
Number
of
Positions
  
Fair
Value
  
Unrealized
Losses
  
Number
of
Positions
 
As of September 30, 2018
                           
AFS securities:
                           
Federal agency
 
$
39,069
  
$
(916
)
  
4
  
$
44,193
  
$
(796
)
  
4
  
$
83,262
  
$
(1,712
)
  
8
 
State & municipal
  
12,347
   
(115
)
  
22
   
16,165
   
(272
)
  
25
   
28,512
   
(387
)
  
47
 
Mortgage-backed
  
297,802
   
(9,061
)
  
72
   
178,186
   
(8,215
)
  
48
   
475,988
   
(17,276
)
  
120
 
Collateralized mortgage obligations
  
83,566
   
(1,816
)
  
16
   
384,459
   
(19,941
)
  
70
   
468,025
   
(21,757
)
  
86
 
Total securities with unrealized losses
 
$
432,784
  
$
(11,908
)
  
114
  
$
623,003
  
$
(29,224
)
  
147
  
$
1,055,787
  
$
(41,132
)
  
261
 
                                     
HTM securities:
                                    
Federal agency
 
$
9,949
  
$
(46
)
  
2
  
$
-
  
$
-
   
-
  
$
9,949
  
$
(46
)
  
2
 
Mortgage-backed
  
55,712
   
(1,678
)
  
5
   
42,778
   
(2,466
)
  
4
   
98,490
   
(4,144
)
  
9
 
Collateralized mortgage obligations
  
153,768
   
(2,195
)
  
22
   
97,515
   
(4,952
)
  
16
   
251,283
   
(7,147
)
  
38
 
State & municipal
  
84,258
   
(1,276
)
  
134
   
27,384
   
(1,765
)
  
41
   
111,642
   
(3,041
)
  
175
 
Total securities with unrealized losses
 
$
303,687
  
$
(5,195
)
  
163
  
$
167,677
  
$
(9,183
)
  
61
  
$
471,364
  
$
(14,378
)
  
224
 
                                     
As of December 31, 2017
                                    
AFS securities:
                                    
Federal agency
 
$
64,653
  
$
(242
)
  
5
  
$
44,246
  
$
(721
)
  
4
  
$
108,899
  
$
(963
)
  
9
 
State & municipal
  
23,566
   
(200
)
  
39
   
5,994
   
(77
)
  
8
   
29,560
   
(277
)
  
47
 
Mortgage-backed
  
317,630
   
(2,381
)
  
55
   
58,316
   
(1,187
)
  
24
   
375,946
   
(3,568
)
  
79
 
Collateralized mortgage obligations
  
227,917
   
(2,658
)
  
35
   
275,303
   
(8,521
)
  
42
   
503,220
   
(11,179
)
  
77
 
Equity securities
  
-
   
-
   
-
   
2,959
   
(146
)
  
1
   
2,959
   
(146
)
  
1
 
Total securities with unrealized losses
 
$
633,766
  
$
(5,481
)
  
134
  
$
386,818
  
$
(10,652
)
  
79
  
$
1,020,584
  
$
(16,133
)
  
213
 
 
                                    
HTM securities:
                                    
Mortgage-backed
 
$
15,477
  
$
(140
)
  
2
  
$
33,703
  
$
(670
)
  
2
  
$
49,180
  
$
(810
)
  
4
 
Collateralized mortgage obligations
  
118,476
   
(1,064
)
  
17
   
37,614
   
(1,513
)
  
6
   
156,090
   
(2,577
)
  
23
 
State & municipal
  
22,387
   
(132
)
  
40
   
15,720
   
(488
)
  
24
   
38,107
   
(620
)
  
64
 
Total securities with unrealized losses
 
$
156,340
  
$
(1,336
)
  
59
  
$
87,037
  
$
(2,671
)
  
32
  
$
243,377
  
$
(4,007
)
  
91
 
Gains and Losses on Equity Securities
The following tables set forth information with regard to gains and losses on equity securities at September 30, 2018:

(In thousands)
 
Three months ended
September 30, 2018
  
Nine months ended
September 30, 2018
 
Net gains and losses recognized on equity securities
 
$
412
  
$
575
 
Less: Net gains and losses recognized during the period on equity securities sold during the period
  
511
   
555
 
Unrealized gains and losses recognized on equity securities still held
 
$
(99
)
 
$
20
 
Contractual Maturities of Debt Securities
The following tables set forth information with regard to contractual maturities of debt securities at September 30, 2018:
 
(In thousands)
 
Amortized
 Cost
  
Estimated
 Fair Value
 
AFS debt securities:
      
Within one year
 
$
46,641
  
$
46,521
 
From one to five years
  
86,348
   
84,188
 
From five to ten years
  
176,260
   
171,240
 
After ten years
  
832,196
   
799,125
 
Total AFS debt securities
 
$
1,141,445
  
$
1,101,074
 
HTM debt securities:
        
Within one year
 
$
89,011
  
$
89,011
 
From one to five years
  
53,217
   
53,177
 
From five to ten years
  
215,931
   
209,974
 
After ten years
  
301,790
   
293,570
 
Total HTM debt securities
 
$
659,949
  
$
645,732