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Securities (Tables)
 12 Months Ended
Dec. 31, 2024
Securities [Abstract]  
Amortized Cost, Estimated Fair Value and Unrealized Gains (Losses) of AFS Securities
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, 2024
                        
U.S. treasury
   $ 108,838     $ 59     $ (6,107 )   $ 102,790  
Federal agency
    
248,348
      
-
      
(29,831
)
    
218,517
  
State & municipal
    
95,457
      
-
      
(7,967
)
    
87,490
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
435,825
      
2
      
(41,528
)
    
394,299
  
U.S. government agency securities
    
76,528
      
9
      
(6,471
)
    
70,066
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
546,685
      
142
      
(42,831
)
    
503,996
  
U.S. government agency securities
    
179,136
      
39
      
(26,683
)
    
152,492
  
Corporate
    
48,482
      
-
      
(3,468
)
    
45,014
  
Total AFS securities
  
$
1,739,299
    
$
251
    
$
(164,886
)
  
$
1,574,664
  
As of December 31, 2023
                                
U.S. treasury
   $ 133,302     $ -     $ (8,278 )   $ 125,024
Federal agency
    
248,384
      
-
      
(33,644
)
    
214,740
  
State & municipal
    
96,251
      
11
      
(9,956
)
    
86,306
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
399,532
      
7
      
(44,264
)
    
355,275
  
U.S. government securities
    
74,281
      
14
      
(7,302
)
    
66,993
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
452,715
      
15
      
(48,257
)
    
404,473
  
U.S. government securities
    
162,171
      
-
      
(25,100
)
    
137,071
  
Corporate
    48,442       -       (7,466 )     40,976  
Total AFS securities
  
$
1,615,078
    
$
47
    
$
(184,267
)
  
$
1,430,858
  
Amortized Cost, Estimated Fair Value and Unrealized Gains (Losses) of HTM Securities
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
  
As of December 31, 2024
                        
Federal agency
  
$
100,000
    
$
-
    
$
(16,656
)
  
$
83,344
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
208,579
      
-
      
(34,349
)
    
174,230
  
U.S. government agency securities
    
15,611
      
1
      
(516
)
    
15,096
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
168,018
      
-
      
(11,554
)
    
156,464
  
U.S. government agency securities
    
60,906
      
-
      
(11,245
)
    
49,661
  
State & municipal
    
289,807
      
41
      
(18,698
)
    
271,150
  
Total HTM securities
  
$
842,921
    
$
42
    
$
(93,018
)
  
$
749,945
  
As of December 31, 2023
                                
Federal agency
   $ 100,000     $ -     $ (17,784 )   $ 82,216  
Mortgage-backed:
                                
Government-sponsored enterprises
    
228,720
      
-
      
(31,613
)
    
197,107
  
U.S. government agency securities
    
17,086
      
3
      
(566
)
    
16,523
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
187,457
      
57
      
(12,021
)
    
175,493
  
U.S. government agency securities
    
63,878
      
-
      
(10,908
)
    
52,970
  
State & municipal
    
308,126
      
211
      
(18,122
)
    
290,215
  
Total HTM securities
  
$
905,267
    
$
271
    
$
(91,014
)
  
$
814,524
  
Gains and (Losses) on Equity Securities
The following table sets forth information with regard to gains and (losses) on equity securities:

 
Years Ended
December 31,
  
(In thousands)
  
2024
    
2023
      2022  
Net gains recognized on equity securities
  
$
505
    
$
135
     $ (1,135 )
Less: Net gains recognized on equity securities sold during the period
    
-
      
-
       -  
Unrealized gains and recognized on equity securities still held
  
$
505
    
$
135
     $ (1,135 )
Contractual Maturities of Debt Securities
The following table sets forth information with regard to contractual maturities of debt securities at December 31, 2024:

(In thousands)
  
Amortized
Cost
    
Estimated
Fair Value
  
AFS debt securities:
            
Within one year
  
$
39,826
    
$
39,037
  
From one to five years
    
624,817
      
571,489
  
From five to ten years
    
241,998
      
220,764
  
After ten years
    
832,658
      
743,374
  
Total AFS debt securities
  
$
1,739,299
    
$
1,574,664
  
HTM debt securities:
                
Within one year
  
$
97,329
    
$
97,221
  
From one to five years
    
163,406
      
153,627
  
From five to ten years
    
193,570
      
168,429
  
After ten years
    
388,616
      
330,668
  
Total HTM debt securities
  
$
842,921
    
$
749,945
  
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 were 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, 2024
                                                      
AFS securities:
                                                      
U.S. treasury
  $ -     $ -       -     $ 92,737     $ (6,107 )     5     $ 92,737     $ (6,107 )     5
  
Federal agency
    
-
      
-
      
-
      
218,517
      
(29,831
)
    
16
      
218,517
      
(29,831
)
    
16
  
State & municipal
     759       (4 )     1       86,731       (7,963 )     66       87,490       (7,967 )     67  
Mortgage-backed
    
95,153
      
(1,374
)
    
16
      
368,589
      
(46,625
)
    
152
      
463,742
      
(47,999
)
    
168
  
Collateralized mortgage obligations
    
98,494
      
(1,128
)
    
14
      
480,891
      
(68,386
)
    
116
      
579,385
      
(69,514
)
    
130
  
Corporate
     1,478       (9 )     1       43,536       (3,459 )     14       45,014       (3,468 )     15  
Total securities with unrealized losses
  
$
195,884
    
$
(2,515
)
    
32
    
$
1,291,001
    
$
(162,371
)
    
369
    
$
1,486,885
    
$
(164,886
)
    
401
  
HTM securities:
                                                                        
Federal agency
  
$
-
    
$
-
      
-
    
$
83,344
    
$
(16,656
)
    
4
    
$
83,344
    
$
(16,656
)
    
4
  
Mortgage-backed
    -       -       -       189,271       (34,865 )     34       189,271       (34,865 )     34  
Collateralized mortgage obligations
     7,147       (7 )     1       198,978       (22,792 )     52       206,125       (22,799 )     53  
State & municipal
    
9,458
      
(107
)
    
12
      
168,945
      
(18,591
)
    
186
      
178,403
      
(18,698
)
    
198
  
Total securities with unrealized losses
  
$
16,605
    
$
(114
)
    
13
    
$
640,538
    
$
(92,904
)
    
276
    
$
657,143
    
$
(93,018
)
    
289
  
As of December 31, 2023
                                                                        
AFS securities:
                                                                        
U.S. treasury
   $ -     $ -       -     $ 125,024     $ (8,278 )     8     $ 125,024     $ (8,278 )     8  
Federal agency
    
-
      
-
      
-
      
214,740
      
(33,644
)
    
16
      
214,740
      
(33,644
)
    
16
  
State & municipal
     -       -       -       85,528       (9,956 )     66       85,528       (9,956 )     66  
Mortgage-backed
    
53
      
(1
)
    
7
      
421,259
      
(51,565
)
    
156
      
421,312
      
(51,566
)
    
163
  
Collateralized mortgage obligations
    
1,333
      
(6
)
    
2
      
536,678
      
(73,351
)
    
118
      
538,011
      
(73,357
)
    
120
  
Corporate
     1,379       (75 )     1       39,597       (7,391 )     14       40,976       (7,466 )     15  
Total securities with unrealized losses
  
$
2,765
    
$
(82
)
    
10
    
$
1,422,826
    
$
(184,185
)
    
378
    
$
1,425,591
    
$
(184,267
)
    
388
  
HTM securities:
                                                                        
Federal agency
  $ -     $ -       -     $ 82,216     $ (17,784 )     4     $ 82,216     $ (17,784 )     4  
Mortgage-backed
     12,221       (365 )     1       201,320       (31,814 )     33       213,541       (32,179 )     34  
Collateralized mortgage obligations     -       -       -       219,820       (22,929 )     54       219,820       (22,929 )     54  
State & municipal
    
14,422
      
(127
)
    
21
      
171,904
      
(17,995
)
    
189
      
186,326
      
(18,122
)
    
210
  
Total securities with unrealized losses
  
$
26,643
    
$
(492
)
    
22
    
$
675,260
    
$
(90,522
)
    
280
    
$
701,903
    
$
(91,014
)
    
302