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Securities, AFS Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Position
Dec. 31, 2024
USD ($)
Position
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 83,144 $ 195,884
12 months or longer 1,237,113 1,291,001
Total 1,320,257 1,486,885
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (335) (2,515)
12 months or longer (112,620) (162,371)
Total $ (112,955) $ (164,886)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 10 32
12 months or longer | Position 349 369
Total | Position 359 401
AIR on AFS debt securities $ 4,700 $ 4,400
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
U.S. Treasury [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 0 $ 0
12 months or longer 96,046 92,737
Total 96,046 92,737
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 0
12 months or longer (3,173) (6,107)
Total $ (3,173) $ (6,107)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 0
12 months or longer | Position 5 5
Total | Position 5 5
Federal Agency [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 0 $ 0
12 months or longer 229,056 218,517
Total 229,056 218,517
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 0
12 months or longer (19,265) (29,831)
Total $ (19,265) $ (29,831)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 0
12 months or longer | Position 16 16
Total | Position 16 16
State & Municipal [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 0 $ 759
12 months or longer 87,933 86,731
Total 87,933 87,490
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 (4)
12 months or longer (4,664) (7,963)
Total $ (4,664) $ (7,967)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 1
12 months or longer | Position 65 66
Total | Position 65 67
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 35,208 $ 95,153
12 months or longer 347,339 368,589
Total 382,547 463,742
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (282) (1,374)
12 months or longer (30,974) (46,625)
Total $ (31,256) $ (47,999)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 4 16
12 months or longer | Position 143 152
Total | Position 147 168
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 47,936 $ 98,494
12 months or longer 451,292 480,891
Total 499,228 579,385
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (53) (1,128)
12 months or longer (52,490) (68,386)
Total $ (52,543) $ (69,514)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 6 14
12 months or longer | Position 111 116
Total | Position 117 130
Corporate [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 0 $ 1,478
12 months or longer 25,447 43,536
Total 25,447 45,014
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 (9)
12 months or longer (2,054) (3,459)
Total $ (2,054) $ (3,468)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 1
12 months or longer | Position 9 14
Total | Position 9 15