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Securities (Tables)
 6 Months Ended
Jun. 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
 
June 30, 2018
            
Federal agency
 
$
119,964
  
$
-
  
$
1,394
  
$
118,570
 
State & municipal
  
36,676
   
28
   
302
   
36,402
 
Mortgage-backed:
                
Government-sponsored enterprises
  
503,303
   
307
   
13,579
   
490,031
 
U.S. government agency securities
  
30,232
   
225
   
843
   
29,614
 
Collateralized mortgage obligations:
                
Government-sponsored enterprises
  
486,029
   
234
   
17,702
   
468,561
 
U.S. government agency securities
  
51,309
   
132
   
1,680
   
49,761
 
Total AFS securities
 
$
1,227,513
  
$
926
  
$
35,500
  
$
1,192,939
 
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
 
June 30, 2018
            
Mortgage-backed:
            
Government-sponsored enterprises
 
$
90,696
  
$
-
  
$
3,244
  
$
87,452
 
U.S. government agency securities
  
376
   
43
   
-
   
419
 
Collateralized mortgage obligations:
                
Government-sponsored enterprises
  
229,353
   
92
   
5,989
   
223,456
 
U.S. government agency securities
  
9,788
   
1
   
-
   
9,789
 
State & municipal
  
213,950
   
265
   
2,352
   
211,863
 
Total HTM securities
 
$
544,163
  
$
401
  
$
11,585
  
$
532,979
 
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 June 30, 2018
                           
AFS securities:
                           
Federal agency
 
$
39,457
  
$
(526
)
  
4
  
$
79,113
  
$
(868
)
  
6
  
$
118,570
  
$
(1,394
)
  
10
 
State & municipal
  
23,273
   
(232
)
  
37
   
5,479
   
(70
)
  
8
   
28,752
   
(302
)
  
45
 
Mortgage-backed
  
432,173
   
(11,590
)
  
93
   
60,657
   
(2,832
)
  
26
   
492,830
   
(14,422
)
  
119
 
Collateralized mortgage obligations
  
233,086
   
(6,076
)
  
40
   
260,766
   
(13,306
)
  
46
   
493,852
   
(19,382
)
  
86
 
Total securities with unrealized losses
 
$
727,989
  
$
(18,424
)
  
174
  
$
406,015
  
$
(17,076
)
  
86
  
$
1,134,004
  
$
(35,500
)
  
260
 
                                     
HTM securities:
                                    
Mortgage-backed
 
$
56,920
  
$
(1,686
)
  
4
  
$
30,532
  
$
(1,558
)
  
2
  
$
87,452
  
$
(3,244
)
  
6
 
Collateralized mortgage obligations
  
149,776
   
(3,693
)
  
24
   
33,586
   
(2,296
)
  
6
   
183,362
   
(5,989
)
  
30
 
State & municipal
  
73,496
   
(1,310
)
  
110
   
15,665
   
(1,042
)
  
25
   
89,161
   
(2,352
)
  
135
 
Total securities with unrealized losses
 
$
280,192
  
$
(6,689
)
  
138
  
$
79,783
  
$
(4,896
)
  
33
  
$
359,975
  
$
(11,585
)
  
171
 
                                     
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:

(In thousands)
 
Three months ended
June 30, 2018
  
Six months ended
June 30, 2018
 
Net gains and losses recognized on equity securities
 
$
91
  
$
163
 
Less: Net gains and losses recognized during the period on equity securities sold during the period
  
-
   
44
 
Unrealized gains and losses recognized on equity securities still held
 
$
91
  
$
119
 
Contractual Maturities of Debt Securities
The following tables set forth information with regard to contractual maturities of debt securities at June 30, 2018:
 
(In thousands)
 
Amortized
 Cost
  
Estimated
 Fair Value
 
AFS debt securities:
      
Within one year
 
$
79,927
  
$
79,698
 
From one to five years
  
78,012
   
76,566
 
From five to ten years
  
186,454
   
182,532
 
After ten years
  
883,120
   
854,143
 
Total AFS debt securities
 
$
1,227,513
  
$
1,192,939
 
HTM debt securities:
        
Within one year
 
$
51,786
  
$
51,786
 
From one to five years
  
50,159
   
50,281
 
From five to ten years
  
201,007
   
196,191
 
After ten years
  
241,211
   
234,721
 
Total HTM debt securities
 
$
544,163
  
$
532,979