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Securities (Tables)
 3 Months Ended
Mar. 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 March 31, 2024
                        
U.S. treasury
   $ 133,442     $ -     $ (8,759 )   $ 124,683  
Federal agency
    
248,375
      
-
      
(35,071
)
    
213,304
  
State & municipal
    
96,054
      
1
      
(10,022
)
    
86,033
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
387,479
      
3
      
(45,461
)
    
342,021
  
U.S. government agency securities
    
71,036
      
10
      
(7,520
)
    
63,526
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
452,853
      
49
      
(50,135
)
    
402,767
  
U.S. government agency securities
    
170,293
      
-
      
(26,034
)
    
144,259
  
Corporate
    
48,451
      
-
      
(6,573
)
    
41,878
  
Total AFS securities
  
$
1,607,983
    
$
63
    
$
(189,575
)
  
$
1,418,471
  
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 agency securities
    
74,281
      
14
      
(7,302
)
    
66,993
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
452,715
      
15
      
(48,257
)
    
404,473
  
U.S. government agency 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 March 31, 2024
                        
Federal agency
  
$
100,000
    
$
-
    
$
(18,440
)
  
$
81,560
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
224,344
      
-
      
(34,187
)
    
190,157
  
U.S. government agency securities
    
16,742
      
2
      
(736
)
    
16,008
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
182,813
      
-
      
(13,466
)
    
169,347
  
U.S. government agency securities
    
63,137
      
-
      
(11,206
)
    
51,931
  
State & municipal
    
303,827
      
99
      
(19,610
)
    
284,316
  
Total HTM securities
  
$
890,863
    
$
101
    
$
(97,645
)
  
$
793,319
  
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:

Three Months Ended
March 31,
  
(In thousands)
2024
  
2023
  
Net (losses) and gains recognized on equity securities
  
$
(101
)
  
$
2
  
Less: Net (losses) and gains recognized on equity securities sold during the period
    
-
      
-
  
Unrealized (losses) and gains recognized on equity securities still held
  
$
(101
)
  
$
2
  
Contractual Maturities of Debt Securities
The following table sets forth information with regard to contractual maturities of debt securities at March 31, 2024:

(In thousands)
  
Amortized
Cost
    
Estimated
Fair Value
  
AFS debt securities:
            
Within one year
  
$
50,294
    
$
49,553
  
From one to five years
    
567,513
      
508,211
  
From five to ten years
    
314,839
      
277,648
  
After ten years
    
675,337
      
583,059
  
Total AFS debt securities
  
$
1,607,983
    
$
1,418,471
  
HTM debt securities:
                
Within one year
  
$
98,660
    
$
98,460
  
From one to five years
    
125,141
      
119,411
  
From five to ten years
    
242,973
      
210,783
  
After ten years
    
424,089
      
364,665
  
Total HTM debt securities
  
$
890,863
    
$
793,319
  
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, 2024
                                                      
AFS securities:
                                                      
U.S. treasury
   $ -     $ -     -     $ 124,683     $ (8,759 )     8     $ 124,683     $ (8,759 )     8  
Federal agency
    
-
      
-
      
-
      
213,304
      
(35,071
)
    
16
      
213,304
      
(35,071
)
    
16
  
State & municipal
    
-
      
-
   
-
      
85,266
      
(10,022
)
    
66
      
85,266
      
(10,022
)
    
66
  
Mortgage-backed
    
136
      
(1
)
    
9
      
404,618
      
(52,980
)
    
158
      
404,754
      
(52,981
)
    
167
  
Collateralized mortgage obligations
    
11,033
      
(59
)
    
2
      
523,989
      
(76,110
)
    
120
      
535,022
      
(76,169
)
    
122
  
Corporate
    
1,459
      
(2
)
    
1
      
40,419
      
(6,571
)
    
14
      
41,878
      
(6,573
)
    
15
  
Total securities with unrealized losses
  
$
12,628
    
$
(62
)
    
12
    
$
1,392,279
    
$
(189,513
)
    
382
    
$
1,404,907
    
$
(189,575
)
    
394
  
                                                                         
HTM securities:
                                                                        
Federal agency
  
$
-
    
$
-
      
-
    
$
81,560
    
$
(18,440
)
    
4
    
$
81,560
    
$
(18,440
)
    
4
  
Mortgage-backed
    
11,905
      
(489
)
    
1
      
194,181
      
(34,434
)
    
33
      
206,086
      
(34,923
)
    
34
  
Collateralized mortgage obligation
     8,189       (58 )     1       213,088       (24,614 )     52       221,277       (24,672 )     53  
State & municipal
    
4,423
      
(13
)
    
4
      
181,355
      
(19,597
)
    
205
      
185,778
      
(19,610
)
    
209
  
Total securities with unrealized losses
  
$
24,517
    
$
(560
)
    
6
    
$
670,184
    
$
(97,085
)
    
294
    
$
694,701
    
$
(97,645
)
    
300
  
                                                                         
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