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Securities, AFS Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Position
Dec. 31, 2023
USD ($)
Position
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 54,189 $ 2,765
12 months or longer 1,370,875 1,422,826
Total 1,425,064 1,425,591
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (145) (82)
12 months or longer (139,488) (184,185)
Total $ (139,633) $ (184,267)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 8 10
12 months or longer | Position 375 378
Total | Position 383 388
AIR on AFS debt securities $ 4,100 $ 3,900
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 118,430 125,024
Total 118,430 125,024
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 0
12 months or longer (5,284) (8,278)
Total $ (5,284) $ (8,278)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 0
12 months or longer | Position 7 8
Total | Position 7 8
Federal Agency [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 0 $ 0
12 months or longer 222,639 214,740
Total 222,639 214,740
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 0
12 months or longer (25,718) (33,644)
Total $ (25,718) $ (33,644)
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 $ 0
12 months or longer 88,132 85,528
Total 88,132 85,528
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 0
12 months or longer (6,761) (9,956)
Total $ (6,761) $ (9,956)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 0
12 months or longer | Position 66 66
Total | Position 66 66
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 15,893 $ 53
12 months or longer 389,558 421,259
Total 405,451 421,312
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (47) (1)
12 months or longer (37,845) (51,565)
Total $ (37,892) $ (51,566)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 2 7
12 months or longer | Position 153 156
Total | Position 155 163
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 36,841 $ 1,333
12 months or longer 510,166 536,678
Total 547,007 538,011
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (74) (6)
12 months or longer (58,837) (73,351)
Total $ (58,911) $ (73,357)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 5 2
12 months or longer | Position 119 118
Total | Position 124 120
Corporate [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 1,455 $ 1,379
12 months or longer 41,950 39,597
Total 43,405 40,976
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (24) (75)
12 months or longer (5,043) (7,391)
Total $ (5,067) $ (7,466)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 1 1
12 months or longer | Position 14 14
Total | Position 15 15