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Securities (Tables)
 3 Months Ended
Mar. 31, 2023
Securities [Abstract]  
Amortized Cost, Estimated Fair Value and Unrealized Gains (Losses) of Available for Sale ("AFS") Securities
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
  
As of March 31, 2023
                        
U.S. treasury
   $ 132,878     $ -     $ (9,299 )   $ 123,579  
Federal agency
    
248,410
      
-
      
(38,190
)
    
210,220
  
State & municipal
    
96,841
      
17
      
(11,825
)
    
85,033
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
440,537
      
12
      
(48,986
)
    
391,563
  
U.S. government agency securities
    
78,234
      
16
      
(6,235
)
    
72,015
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
486,538
      
14
      
(51,869
)
    
434,683
  
U.S. government agency securities
    
169,088
      
-
      
(21,410
)
    
147,678
  
Corporate
    
55,414
      
-
      
(8,177
)
    
47,237
  
Total AFS securities
  
$
1,707,940
    
$
59
    
$
(195,991
)
  
$
1,512,008
  
As of December 31, 2022
                                
U.S. treasury
   $ 132,891     $ -     $ (11,233 )   $ 121,658  
Federal agency
    
248,419
      
-
      
(42,000
)
    
206,419
  
State & municipal
    
97,036
      
5
      
(14,190
)
    
82,851
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
454,177
      
9
      
(54,675
)
    
399,511
  
U.S. government agency securities
    
81,844
      
15
      
(7,676
)
    
74,183
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
498,021
      
9
      
(59,473
)
    
438,557
  
U.S. government agency securities
    
171,090
      
-
      
(21,284
)
    
149,806
  
Corporate
    
60,404
      
-
      
(6,164
)
    
54,240
  
Total AFS securities
  
$
1,743,882
    
$
38
    
$
(216,695
)
  
$
1,527,225
  
Amortized Cost, Estimated Fair Value and Unrealized Gains (Losses) of Held to Maturity ("HTM") Securities
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
  
As of March 31, 2023
                        
Federal agency
  
$
100,000
    
$
-
    
$
(19,055
)
  
$
80,945
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
244,670
      
-
      
(33,729
)
    
210,941
  
U.S. government agency securities
    
17,399
      
3
      
(464
)
    
16,938
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
202,831
      
274
      
(12,236
)
    
190,869
  
U.S. government agency securities
    
65,989
      
-
      
(9,651
)
    
56,338
  
State & municipal
    
275,935
      
147
      
(19,449
)
    
256,633
  
Total HTM securities
  
$
906,824
    
$
424
    
$
(94,584
)
  
$
812,664
  
As of December 31, 2022
                                
Federal agency
  
$
100,000
    
$
-
    
$
(20,678
)
  
$
79,322
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
249,511
      
-
      
(36,819
)
    
212,692
  
U.S. government agency securities
    
18,396
      
4
      
(619
)
    
17,781
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
207,738
      
200
      
(14,876
)
    
193,062
  
U.S. government agency securities
    
66,628
      
-
      
(9,842
)
    
56,786
  
State & municipal
    
277,244
      
5
      
(24,245
)
    
253,004
  
Total HTM securities
  
$
919,517
    
$
209
    
$
(107,079
)
  
$
812,647
  
Gains and (Losses) on Equity Securities
The following table sets forth information with regard to gains and (losses) on equity securities:

 
Three Months Ended March 31,
  
(In thousands)
  
2023
    
2022
  
Net gains and (losses) recognized on equity securities
  
$
2
    
$
(183
)
Less: Net gains and (losses) recognized on equity securities sold during the period
    
-
      
-
  
Unrealized gains and (losses) recognized on equity securities still held
  
$
2
    
$
(183
)
Contractual Maturities of Debt Securities
The following table sets forth information with regard to contractual maturities of debt securities at March 31, 2023:

(In thousands)
  
Amortized
Cost
    
Estimated
Fair Value
  
AFS debt securities:
            
Within one year
  
$
360
    
$
357
  
From one to five years
    
406,527
      
370,571
  
From five to ten years
    
566,555
      
495,942
  
After ten years
    
734,498
      
645,138
  
Total AFS debt securities
  
$
1,707,940
    
$
1,512,008
  
HTM debt securities:
                
Within one year
  
$
51,124
    
$
51,112
  
From one to five years
    
100,684
      
98,539
  
From five to ten years
    
270,074
      
237,794
  
After ten years
    
484,942
      
425,219
  
Total HTM debt securities
  
$
906,824
    
$
812,664
  
Investment Securities with Unrealized Losses
The following table sets forth information with regard to investment securities with unrealized losses, for which an allowance for credit losses has not been recorded, 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 March 31, 2023
                                                      
AFS securities:
                                                      
U.S. treasury
   $ 9,818     $ (114 )     1     $ 113,761     $ (9,185 )     7     $ 123,579     $ (9,299 )     8  
Federal agency
    
-
      
-
      
-
      
210,220
      
(38,190
)
    
16
      
210,220
      
(38,190
)
    
16
  
State & municipal
    
1,454
      
(51
)
    
1
      
82,792
      
(11,774
)
    
65
      
84,246
      
(11,825
)
    
66
  
Mortgage-backed
    
22,278
      
(736
)
    
33
      
440,057
      
(54,485
)
    
134
      
462,335
      
(55,221
)
    
167
  
Collateralized mortgage obligations
    
74,631
      
(2,080
)
    
23
      
504,718
      
(71,199
)
    
97
      
579,349
      
(73,279
)
    
120
  
Corporate
    
13,677
      
(737
)
    
4
      
33,560
      
(7,440
)
    
13
      
47,237
      
(8,177
)
    
17
  
Total securities with unrealized losses
  
$
121,858
    
$
(3,718
)
    
62
    
$
1,385,108
    
$
(192,273
)
    
332
    
$
1,506,966
    
$
(195,991
)
    
394
  
                                                                         
HTM securities:
                                                                        
Federal agency
  
$
-
    
$
-
      
-
    
$
80,945
    
$
(19,055
)
    
4
    
$
80,945
    
$
(19,055
)
    
4
  
Mortgage-backed
    
28,642
      
(1,033
)
    
7
      
199,125
      
(33,160
)
    
27
      
227,767
      
(34,193
)
    
34
  
Collateralized mortgage obligation
     87,826       (3,168 )     17       149,636       (18,719 )     37       237,462       (21,887 )     54  
State & municipal
    
52,808
      
(561
)
    
75
      
131,416
      
(18,888
)
    
134
      
184,224
      
(19,449
)
    
209
  
Total securities with unrealized losses
  
$
169,276
    
$
(4,762
)
    
99
    
$
561,122
    
$
(89,822
)
    
202
    
$
730,398
    
$
(94,584
)
    
301
  
                                                                         
As of December 31, 2022
                                                                        
AFS securities:
                                                                        
U.S. treasury
   $ 55,616     $ (3,864 )     5     $ 66,042     $ (7,369 )     3     $ 121,658     $ (11,233 )     8  
Federal agency
    
-
      
-
      
-
      
206,419
      
(42,000
)
    
16
      
206,419
      
(42,000
)
    
16
  
State & municipal
     3,679       (341 )     2       78,395       (13,849 )     64       82,074       (14,190 )     66  
Mortgage-backed
    
204,447
      
(15,048
)
    
149
      
267,926
      
(47,303
)
    
32
      
472,373
      
(62,351
)
    
181
  
Collateralized mortgage obligations
    
211,612
      
(14,458
)
    
77
      
374,376
      
(66,299
)
    
49
      
585,988
      
(80,757
)
    
126
  
Corporate
     34,434       (2,970 )     12       19,806       (3,194 )     6       54,240       (6,164 )     18  
Total securities with unrealized losses
  
$
509,788
    
$
(36,681
)
    
245
    
$
1,012,964
    
$
(180,014
)
    
170
    
$
1,522,752
    
$
(216,695
)
    
415
  
                                                                         
HTM securities:
                                                                        
Federal agency
  
$
-
    
$
-
      
-
    
$
79,322
    
$
(20,678
)
    
4
    
$
79,322
    
$
(20,678
)
    
4
  
Mortgage-backed
     91,417       (9,096 )     21       138,936       (28,342 )     13       230,353       (37,438 )     34  
Collateralized mortgage obligations
     191,644       (13,863 )     47       48,289       (10,855 )     8       239,933       (24,718 )     55  
State & municipal
    
110,727
      
(4,930
)
    
149
      
82,949
      
(19,315
)
    
76
      
193,676
      
(24,245
)
    
225
  
Total securities with unrealized losses
  
$
393,788
    
$
(27,889
)
    
217
    
$
349,496
    
$
(79,190
)
    
101
    
$
743,284
    
$
(107,079
)
    
318