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Securities (Tables)
 12 Months Ended
Dec. 31, 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 AFS securities are as follows:
 
(In thousands)
 
Amortized Cost
  
Unrealized Gains
  
Unrealized Losses
  
Estimated Fair Value
 
As of December 31, 2018
            
Federal agency
 
$
84,982
  
$
10
  
$
693
  
$
84,299
 
State & municipal
  
30,136
   
16
   
237
   
29,915
 
Mortgage-backed:
                
Government-sponsored enterprises
  
493,225
   
439
   
10,354
   
483,310
 
U.S. government agency securities
  
29,190
   
270
   
475
   
28,985
 
Collateralized mortgage obligations:
                
Government-sponsored enterprises
  
332,409
   
344
   
7,211
   
325,542
 
U.S. government agency securities
  
47,684
   
137
   
1,376
   
46,445
 
Total AFS securities
 
$
1,017,626
  
$
1,216
  
$
20,346
  
$
998,496
 
As of 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 securities
  
26,363
   
334
   
223
   
26,474
 
Collateralized mortgage obligations:
                
Government-sponsored enterprises
  
496,033
   
254
   
10,114
   
486,173
 
U.S. government 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
 
Sales Transactions of Securities Available for Sale
The components of net realized gains (losses) on the sale of AFS securities are as follows. These amounts were reclassified out of AOCI and into earnings:

 
 
Years ended December 31,
 
(In thousands)
 
2018
  
2017
  
2016
 
Gross realized gains
 
$
-
  
$
2,241
  
$
683
 
Gross realized (losses)
  
(6,622
)
  
(372
)
  
(1,327
)
Net AFS realized (losses) gains
 
$
(6,622
)
 
$
1,869
  
$
(644
)
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 HTM securities are as follows:

(In thousands)
 
Amortized
Cost
  
Unrealized
Gains
  
Unrealized
Losses
  
Estimated
Fair Value
 
December 31, 2018
            
Federal agency
 
$
19,995
  
$
52
  
$
-
  
$
20,047
 
Mortgage-backed:
                
     Government-sponsored enterprises
  
164,618
   
712
   
2,773
   
162,557
 
     U.S. government agency securities
  
15,230
   
403
   
-
   
15,633
 
Collateralized mortgage obligations:
                
     Government-sponsored enterprises
  
257,475
   
1,097
   
3,897
   
254,675
 
     U.S. government agency securities
  
83,148
   
767
   
-
   
83,915
 
State & municipal
  
243,133
   
331
   
1,616
   
241,848
 
Total HTM securities
 
$
783,599
  
$
3,362
  
$
8,286
  
$
778,675
 
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 December 31, 2018
                         
AFS securities:
                           
Federal agency
 
$
-
  
$
-
   
-
  
$
64,294
  
$
(693
)
  
6
  
$
64,294
  
$
(693
)
  
6
 
State & municipal
  
1,715
   
(3
)
  
3
   
22,324
   
(234
)
  
35
   
24,039
   
(237
)
  
38
 
Mortgage-backed
  
18,462
   
(65
)
  
12
   
428,440
   
(10,764
)
  
101
   
446,902
   
(10,829
)
  
113
 
Collateralized Mortgage obligations
  
12,118
   
(69
)
  
5
   
320,908
   
(8,518
)
  
62
   
333,026
   
(8,587
)
  
67
 
Total securities with unrealized losses
 
$
32,295
  
$
(137
)
  
20
  
$
835,966
  
$
(20,209
)
  
204
  
$
868,261
  
$
(20,346
)
  
224
 
 
                                    
HTM securities:
                                    
Mortgage-backed
 $
-
  $
-
   
-
  $
82,579
  $
(2,773
)
  
6
  $
82,579
  $
(2,773
)
  
6
 
Collateralized mortgage obligations
  
4,386
   
(7
)
  
2
   
145,396
   
(3,890
)
  
26
   
149,782
   
(3,897
)
  
28
 
State & municipal
  
18,907
   
(84
)
  
30
   
58,258
   
(1,532
)
  
86
   
77,165
   
(1,616
)
  
116
 
Total securities with unrealized losses
 
$
23,293
  
$
(91
)
  
32
  
$
286,233
  
$
(8,195
)
  
118
  
$
309,526
  
$
(8,286
)
  
150
 
 
                                    
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 December 31, 2018

(In thousands)
 
Year ended
December 31, 2018
 
Net gains and losses recognized on equity securities
 
$
281
 
Less: Net gains and losses recognized during the period on equity securities sold during the year
  
555
 
Unrealized gains and losses recognized on equity securities still held
 
$
(274
)
Contractual Maturities of Debt Securities
The following tables set forth information with regard to contractual maturities of debt securities at December 31, 2018:

(In thousands)
 
Amortized
Cost
  
Estimated Fair
Value
 
AFS debt securities:
      
Within one year
 
$
44,262
  
$
44,218
 
From one to five years
  
84,391
   
83,441
 
From five to ten years
  
163,400
   
160,898
 
After ten years
  
725,573
   
709,939
 
Total AFS debt securities
 
$
1,017,626
  
$
998,496
 
HTM debt securities:
        
Within one year
 
$
85,778
  
$
85,778
 
From one to five years
  
62,441
   
62,558
 
From five to ten years
  
213,184
   
210,480
 
After ten years
  
422,196
   
419,859
 
Total HTM debt securities
 
$
783,599
  
$
778,675