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Securities, AFS Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Position
Dec. 31, 2022
USD ($)
Position
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 2,765 $ 509,788
12 months or longer 1,422,826 1,012,964
Total 1,425,591 1,522,752
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (82) (36,681)
12 months or longer (184,185) (180,014)
Total $ (184,267) $ (216,695)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 10 245
12 months or longer | Position 378 170
Total | Position 388 415
AIR on AFS debt securities $ 3,900 $ 4,200
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 $ 55,616
12 months or longer 125,024 66,042
Total 125,024 121,658
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 (3,864)
12 months or longer (8,278) (7,369)
Total $ (8,278) $ (11,233)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 5
12 months or longer | Position 8 3
Total | Position 8 8
Federal Agency [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 0 $ 0
12 months or longer 214,740 206,419
Total 214,740 206,419
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 0
12 months or longer (33,644) (42,000)
Total $ (33,644) $ (42,000)
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 $ 3,679
12 months or longer 85,528 78,395
Total 85,528 82,074
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 (341)
12 months or longer (9,956) (13,849)
Total $ (9,956) $ (14,190)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 2
12 months or longer | Position 66 64
Total | Position 66 66
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 53 $ 204,447
12 months or longer 421,259 267,926
Total 421,312 472,373
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (1) (15,048)
12 months or longer (51,565) (47,303)
Total $ (51,566) $ (62,351)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 7 149
12 months or longer | Position 156 32
Total | Position 163 181
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 1,333 $ 211,612
12 months or longer 536,678 374,376
Total 538,011 585,988
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (6) (14,458)
12 months or longer (73,351) (66,299)
Total $ (73,357) $ (80,757)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 2 77
12 months or longer | Position 118 49
Total | Position 120 126
Corporate [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 1,379 $ 34,434
12 months or longer 39,597 19,806
Total 40,976 54,240
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (75) (2,970)
12 months or longer (7,391) (3,194)
Total $ (7,466) $ (6,164)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 1 12
12 months or longer | Position 14 6
Total | Position 15 18