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Securities, AFS Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Position
Dec. 31, 2022
USD ($)
Position
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 6,379 $ 509,788
12 months or longer 1,390,772 1,012,964
Total 1,397,151 1,522,752
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (160) (36,681)
12 months or longer (242,172) (180,014)
Total $ (242,332) $ (216,695)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 33 245
12 months or longer | Position 379 170
Total | Position 412 415
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 121,595 66,042
Total 121,595 121,658
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 (3,864)
12 months or longer (11,565) (7,369)
Total $ (11,565) $ (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 203,756 206,419
Total 203,756 206,419
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 0
12 months or longer (44,636) (42,000)
Total $ (44,636) $ (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 $ 747 $ 3,679
12 months or longer 82,538 78,395
Total 83,285 82,074
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (21) (341)
12 months or longer (13,143) (13,849)
Total $ (13,164) $ (14,190)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 1 2
12 months or longer | Position 66 64
Total | Position 67 66
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 463 $ 204,447
12 months or longer 414,686 267,926
Total 415,149 472,373
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (7) (15,048)
12 months or longer (71,300) (47,303)
Total $ (71,307) $ (62,351)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 25 149
12 months or longer | Position 157 32
Total | Position 182 181
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 3,825 $ 211,612
12 months or longer 528,324 374,376
Total 532,149 585,988
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (31) (14,458)
12 months or longer (94,414) (66,299)
Total $ (94,445) $ (80,757)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 6 77
12 months or longer | Position 118 49
Total | Position 124 126
Corporate [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 1,344 $ 34,434
12 months or longer 39,873 19,806
Total 41,217 54,240
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (101) (2,970)
12 months or longer (7,114) (3,194)
Total $ (7,215) $ (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