v3.26.3
Securities - AFS in an Unrealized Loss Position (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
item
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
item
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
item
Number of Securities          
Unrealized loss for less than twelve months | item 57   57   8
Unrealized loss for twelve months or longer | item 310   310   318
Total | item 367   367   326
Fair Value          
Unrealized loss for less than twelve months $ 406,844   $ 406,844   $ 52,812
Unrealized loss for twelve months or longer 973,153   973,153   1,079,848
Total 1,379,997   1,379,997   1,132,660
Unrealized Loss          
Unrealized loss for less than twelve months 17,478   17,478   978
Unrealized loss for twelve months or longer 86,856   86,856   66,160
Total 104,334   104,334   $ 67,138
Unrealized losses $ 4,000 $ 400 $ 4,100 $ 400  
U.S. Treasury securities          
Number of Securities          
Unrealized loss for twelve months or longer | item         1
Total | item         1
Fair Value          
Unrealized loss for twelve months or longer         $ 4,943
Total         4,943
Unrealized Loss          
Unrealized loss for twelve months or longer         55
Total         $ 55
Bonds          
Number of Securities          
Unrealized loss for less than twelve months | item 2   2   2
Unrealized loss for twelve months or longer | item 14   14   13
Total | item 16   16   15
Fair Value          
Unrealized loss for less than twelve months $ 29,779   $ 29,779   $ 2,811
Unrealized loss for twelve months or longer 35,450   35,450   41,004
Total 65,229   65,229   43,815
Unrealized Loss          
Unrealized loss for less than twelve months 221   221   6
Unrealized loss for twelve months or longer 213   213   343
Total $ 434   $ 434   $ 349
Residential mortgage-backed securities          
Number of Securities          
Unrealized loss for less than twelve months | item 16   16   1
Unrealized loss for twelve months or longer | item 116   116   117
Total | item 132   132   118
Fair Value          
Unrealized loss for less than twelve months $ 124,311   $ 124,311   $ 11,390
Unrealized loss for twelve months or longer 217,818   217,818   251,643
Total 342,129   342,129   263,033
Unrealized Loss          
Unrealized loss for less than twelve months 4,750   4,750   46
Unrealized loss for twelve months or longer 30,102   30,102   22,018
Total $ 34,852   $ 34,852   $ 22,064
Commercial mortgage-backed securities          
Number of Securities          
Unrealized loss for less than twelve months | item 10   10   1
Unrealized loss for twelve months or longer | item 18   18   18
Total | item 28   28   19
Fair Value          
Unrealized loss for less than twelve months $ 95,365   $ 95,365   $ 9,893
Unrealized loss for twelve months or longer 198,545   198,545   198,985
Total 293,910   293,910   208,878
Unrealized Loss          
Unrealized loss for less than twelve months 2,571   2,571   43
Unrealized loss for twelve months or longer 4,345   4,345   4,339
Total $ 6,916   $ 6,916   $ 4,382
Collateralized mortgage obligations          
Number of Securities          
Unrealized loss for less than twelve months | item 15   15   3
Unrealized loss for twelve months or longer | item 123   123   128
Total | item 138   138   131
Fair Value          
Unrealized loss for less than twelve months $ 106,941   $ 106,941   $ 21,597
Unrealized loss for twelve months or longer 484,231   484,231   550,788
Total 591,172   591,172   572,385
Unrealized Loss          
Unrealized loss for less than twelve months 4,740   4,740   54
Unrealized loss for twelve months or longer 47,110   47,110   36,539
Total $ 51,850   $ 51,850   $ 36,593
Corporate debt securities          
Number of Securities          
Unrealized loss for less than twelve months | item 2   2   1
Unrealized loss for twelve months or longer | item 2   2   1
Total | item 4   4   2
Fair Value          
Unrealized loss for less than twelve months $ 45,196   $ 45,196   $ 7,121
Unrealized loss for twelve months or longer 16,460   16,460   9,743
Total 61,656   61,656   16,864
Unrealized Loss          
Unrealized loss for less than twelve months 5,099   5,099   829
Unrealized loss for twelve months or longer 1,172   1,172   475
Total 6,271   6,271   $ 1,304
Loss due to change in fair value $ 4,000 $ 400 $ 4,100 $ 400  
States and political subdivisions          
Number of Securities          
Unrealized loss for less than twelve months | item 12   12    
Unrealized loss for twelve months or longer | item 37   37   40
Total | item 49   49   40
Fair Value          
Unrealized loss for less than twelve months $ 5,252   $ 5,252    
Unrealized loss for twelve months or longer 20,649   20,649   $ 22,742
Total 25,901   25,901   22,742
Unrealized Loss          
Unrealized loss for less than twelve months 97   97    
Unrealized loss for twelve months or longer 3,914   3,914   2,391
Total $ 4,011   $ 4,011   $ 2,391