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Securities (Tables)
 3 Months Ended
Mar. 31, 2022
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, 2022
                        
U.S. treasury
   $ 122,444     $
 -     $
 4,809     $
 117,635  
Federal agency

248,445
    

-
    

22,833
    

225,612
  
State & municipal
    
95,339
      
-
      
7,037
      
88,302
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
510,500
      
355
      
25,782
      
485,073
  
U.S. government agency securities
    
75,846
      
59
      
2,581
      
73,324
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
462,288
      
149
      
26,908
      
435,529
  
U.S. government agency securities
    
190,310
      
57
      
7,897
      
182,470
  
Corporate
    
56,000
      
246
      
1,494
      
54,752
  
Total AFS securities
  
$
1,761,172
    
$
866
    
$
99,341
    
$
1,662,697
  
As of December 31, 2021
                                
U.S. treasury
   $ 73,016     $ 59
  $ 6     $ 73,069  
Federal agency
  

248,454
    

-
    

8,523
    

239,931
  
State & municipal
    
95,531
      
116
      
1,559
      
94,088
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
538,036
      
8,036
      
5,589
      
540,483
  
U.S. government agency securities
    
65,339
      
1,108
      
255
      
66,192
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
484,550
      
2,723
      
5,113
      
482,160
  
U.S. government agency securities
    
139,380
      
939
      
884
      
139,435
  
Corporate
    
50,500
      
1,516
      
13
      
52,003
  
Total AFS securities
  
$
1,694,806
    
$
14,497
    
$
21,942
    
$
1,687,361
  
Amortized Cost, Estimated Fair Value, and Unrealized Gains (Losses) of HTM Securities
The amortized cost, estimated fair value and unrealized gains (losses) of securities HTM are as follows:

(In thousands)
  
Amortized
Cost
    
Unrealized
Gains
    
Unrealized
Losses
    
Estimated
Fair Value
  
As of March 31, 2022
                        
Federal agency
  
$
100,000
    
$
-
    
$
10,872
    
$
89,128
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
269,153
      
137
      
16,499
      
252,791
  
U.S. government agency securities
    
7,425
      
50
      
6
      
7,469
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
111,254
      
105
      
2,722
      
108,637
  
U.S. government agency securities
    
74,596
      
76
      
3,755
      
70,917
  
State & municipal
    
332,577
      
394
      
10,278
      
322,693
  
Total HTM securities
  
$
895,005
    
$
762
    
$
44,132
    
$
851,635
  
As of December 31, 2021
                                
Federal agency
  
$
100,000
    
$
-
    
$
4,365
    
$
95,635
  
Mortgage-backed:
                                
Government-sponsored enterprises
    
161,462
      
2,232
      
1,319
      
162,375
  
U.S. government agency securities
    
9,112
      
514
      
-
      
9,626
  
Collateralized mortgage obligations:
                                
Government-sponsored enterprises
    
94,342
      
1,932
      
129
      
96,145
  
U.S. government agency securities
    
44,473
      
336
      
674
      
44,135
  
State & municipal
    
323,821
      
5,026
      
1,503
      
327,344
  
Total HTM securities
  
$
733,210
    
$
10,040
    
$
7,990
    
$
735,260
  
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)
  
2022
    
2021
  
Net (losses) and gains recognized on equity securities
  
$
(183
)
  
$
452
  
Less: Net (losses) and gains recognized on equity securities sold during the period
    
-
      
-
  
Unrealized (losses) and gains recognized on equity securities still held
  
$
(183
)
  
$
452
  
Contractual Maturities of Debt Securities
The following table sets forth information with regard to contractual maturities of debt securities at March 31, 2022:

(In thousands)
  
Amortized
Cost
    
Estimated
Fair Value
  
AFS debt securities:
            
Within one year
  
$
112
    
$
116
  
From one to five years
    
159,032
      
151,684
  
From five to ten years
    
780,821
      
732,172
  
After ten years
    
821,207
      
778,725
  
Total AFS debt securities
  
$
1,761,172
    
$
1,662,697
  
HTM debt securities:
                
Within one year
  
$
103,973
    
$
103,988
  
From one to five years
    
67,047
      
67,061
  
From five to ten years
    
242,804
      
228,349
  
After ten years
    
481,181
      
452,237
  
Total HTM debt securities
  
$
895,005
    
$
851,635
  
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, 2022
                                                      
AFS securities:
                                                      
U.S. treasury
   $ 117,635     $ (4,809 )     7     $ -     $ -       -     $ 117,635     $ (4,809 )     7  
Federal agency
    
2,586
      
(269
)
    
1
      
223,026
      
(22,564
)
    
15
      
225,612
      
(22,833
)
    
16
  
State & municipal
    
74,201
      
(5,690
)
    
55
      
14,097
      
(1,347
)
    
10
      
88,298
      
(7,037
)
    
65
  
Mortgage-backed
    
333,335
      
(11,186
)
    
105
      
182,752
      
(17,177
)
    
19
      
516,087
      
(28,363
)
    
124
  
Collateralized mortgage obligations
    
569,994
      
(33,158
)
    
88
      
20,422
      
(1,647
)
    
7
      
590,416
      
(34,805
)
    
95
  
Corporate
    
44,507
      
(1,494
)
    
14
      
-
      
-
      
-
      
44,507
      
(1,494
)
    
14
  
Total securities with unrealized losses
  
$
1,142,258
    
$
(56,606
)
    
270
    
$
440,297
    
$
(42,735
)
    
51
    
$
1,582,555
    
$
(99,341
)
    
321
  
                                                                         
HTM securities:
                                                                        
Federal agency
  
$
-
    
$
-
      
-
    
$
89,128
    
$
(10,872
)
    
4
    
$
89,128
    
$
(10,872
)
    
4
  
Mortgage-backed
    
238,120
      
(16,505
)
    
27
      
-
      
-
      
-
      
238,120
      
(16,505
)
    
27
  
Collateralized mortgage obligations
     165,781       (6,477 )     35       -       -       -       165,781       (6,477 )     35  
State & municipal
    
115,512
      
(7,299
)
    
116
      
26,492
      
(2,979
)
    
24
      
142,004
      
(10,278
)
    
140
  
Total securities with unrealized losses
  
$
519,413
    
$
(30,281
)
    
178
    
$
115,620
    
$
(13,851
)
    
28
    
$
635,033
    
$
(44,132
)
    
206
  
                                                                         
As of December 31, 2021
                                                                        
AFS securities:
                                                                        
U.S. treasury
   $ 49,105     $ (6 )     2     $ -     $ -       -     $ 49,105     $ (6 )     2  
Federal agency
    
41,618
      
(1,846
)
    
4
      
198,313
      
(6,677
)
    
12
      
239,931
      
(8,523
)
    
16
  
State & municipal
     87,515       (1,559 )     61       -       -       -       87,515       (1,559 )     61  
Mortgage-backed
    
281,217
      
(4,319
)
    
24
      
39,491
      
(1,525
)
    
6
      
320,708
      
(5,844
)
    
30
  
Collateralized mortgage obligations
    
341,673
      
(5,495
)
    
34
      
15,774
      
(502
)
    
4
      
357,447
      
(5,997
)
    
38
  
Corporate
     9,987       (13 )     2       -       -       -       9,987       (13 )     2  
Total securities with unrealized losses
  
$
811,115
    
$
(13,238
)
    
127
    
$
253,578
    
$
(8,704
)
    
22
    
$
1,064,693
    
$
(21,942
)
    
149
  
                                                                         
HTM securities:
                                                                        
Federal agency
  
$
-
    
$
-
      
-
    
$
95,635
    
$
(4,365
)
    
4
    
$
95,635
    
$
(4,365
)
    
4
  
Mortgage-backed
     103,789       (1,319 )     10       -       -       -       103,789       (1,319 )     10  
Collateralized mortgage obligations
     54,612       (803 )     6       -       -       -       54,612       (803 )     6  
State & municipal
    
52,783
      
(1,189
)
    
40
      
8,950
      
(314
)
    
10
      
61,733
      
(1,503
)
    
50
  
Total securities with unrealized losses
  
$
211,184
    
$
(3,311
)
    
56
    
$
104,585
    
$
(4,679
)
    
14
    
$
315,769
    
$
(7,990
)
    
70