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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Number of Securities    
Less Than 12 Months | security 4 41
12 Months or More | security 93 96
Total | security 97 137
Fair Value    
Less Than 12 Months $ 34,434 $ 366,890
12 Months or More 523,405 536,761
Total 557,839 903,651
Unrealized Losses    
Less Than 12 Months (251) (5,989)
12 Months or More (45,803) (66,740)
Total $ (46,054) $ (72,729)
U.S. Treasury securities    
Number of Securities    
Less Than 12 Months | security 1 5
12 Months or More | security 7 5
Total | security 8 10
Fair Value    
Less Than 12 Months $ 10,004 $ 45,045
12 Months or More 69,154 47,723
Total 79,158 92,768
Unrealized Losses    
Less Than 12 Months (2) (362)
12 Months or More (2,383) (3,915)
Total $ (2,385) $ (4,277)
Obligations of U.S. government corporations and agencies    
Number of Securities    
Less Than 12 Months | security   0
12 Months or More | security   2
Total | security   2
Fair Value    
Less Than 12 Months   $ 0
12 Months or More   15,071
Total   15,071
Unrealized Losses    
Less Than 12 Months   0
12 Months or More   (189)
Total   $ (189)
Collateralized mortgage obligations of U.S. government corporations and agencies    
Number of Securities    
Less Than 12 Months | security 3 22
12 Months or More | security 58 56
Total | security 61 78
Fair Value    
Less Than 12 Months $ 24,430 $ 209,511
12 Months or More 308,439 318,104
Total 332,869 527,615
Unrealized Losses    
Less Than 12 Months (249) (3,393)
12 Months or More (32,916) (44,885)
Total $ (33,165) $ (48,278)
Residential mortgage-backed securities of U.S. government corporations and agencies    
Number of Securities    
Less Than 12 Months | security 0 1
12 Months or More | security 18 21
Total | security 18 22
Fair Value    
Less Than 12 Months $ 0 $ 8
12 Months or More 31,688 33,030
Total 31,688 33,038
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More (5,101) (6,905)
Total $ (5,101) $ (6,905)
Commercial mortgage-backed securities of U.S. government corporations and agencies    
Number of Securities    
Less Than 12 Months | security 0 9
12 Months or More | security 10 12
Total | security 10 21
Fair Value    
Less Than 12 Months $ 0 $ 88,040
12 Months or More 114,124 122,833
Total 114,124 210,873
Unrealized Losses    
Less Than 12 Months 0 (1,741)
12 Months or More (5,403) (10,846)
Total $ (5,403) $ (12,587)
Obligations of states and political subdivisions    
Number of Securities    
Less Than 12 Months | security   4
12 Months or More | security   0
Total | security   4
Fair Value    
Less Than 12 Months   $ 24,286
12 Months or More   0
Total   24,286
Unrealized Losses    
Less Than 12 Months   (493)
12 Months or More   0
Total   $ (493)