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Securities, HTM Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Position
Sep. 30, 2023
USD ($)
Position
Dec. 31, 2022
USD ($)
Position
Unrealized Loss Position, Fair Value [Abstract]      
Less than 12 months $ 45,037 $ 45,037 $ 393,788
12 months or longer 649,756 649,756 349,496
Total 694,793 694,793 743,284
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months (2,189) (2,189) (27,889)
12 months or longer (128,345) (128,345) (79,190)
Total $ (130,534) $ (130,534) $ (107,079)
Unrealized Loss Position, Number of Positions [Abstract]      
Less than 12 months | Position 34 34 217
12 months or longer | Position 283 283 101
Total | Position 317 317 318
HTM debt securities, nonaccrual $ 0 $ 0 $ 0
Accrued interest reversed against interest income 0 0 0
Collateral-dependent HTM debt securities 0 0 0
AIR on HTM debt securities $ 3,800 $ 3,800 $ 3,800
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets Other Assets
Past Due [Member]      
Unrealized Loss Position, Number of Positions [Abstract]      
HTM debt securities $ 0 $ 0 $ 0
Federal Agency [Member]      
Unrealized Loss Position, Fair Value [Abstract]      
Less than 12 months 0 0 0
12 months or longer 76,997 76,997 79,322
Total 76,997 76,997 79,322
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months 0 0 0
12 months or longer (23,003) (23,003) (20,678)
Total $ (23,003) $ (23,003) $ (20,678)
Unrealized Loss Position, Number of Positions [Abstract]      
Less than 12 months | Position 0 0 0
12 months or longer | Position 4 4 4
Total | Position 4 4 4
Mortgage-Backed [Member]      
Unrealized Loss Position, Fair Value [Abstract]      
Less than 12 months $ 11,610 $ 11,610 $ 91,417
12 months or longer 192,576 192,576 138,936
Total 204,186 204,186 230,353
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months (975) (975) (9,096)
12 months or longer (45,419) (45,419) (28,342)
Total $ (46,394) $ (46,394) $ (37,438)
Unrealized Loss Position, Number of Positions [Abstract]      
Less than 12 months | Position 1 1 21
12 months or longer | Position 33 33 13
Total | Position 34 34 34
Collateralized Mortgage Obligations [Member]      
Unrealized Loss Position, Fair Value [Abstract]      
Less than 12 months $ 8,834 $ 8,834 $ 191,644
12 months or longer 216,125 216,125 48,289
Total 224,959 224,959 239,933
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months (134) (134) (13,863)
12 months or longer (31,687) (31,687) (10,855)
Total $ (31,821) $ (31,821) $ (24,718)
Unrealized Loss Position, Number of Positions [Abstract]      
Less than 12 months | Position 2 2 47
12 months or longer | Position 53 53 8
Total | Position 55 55 55
State & Municipal [Member]      
Unrealized Loss Position, Fair Value [Abstract]      
Less than 12 months $ 24,593 $ 24,593 $ 110,727
12 months or longer 164,058 164,058 82,949
Total 188,651 188,651 193,676
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months (1,080) (1,080) (4,930)
12 months or longer (28,236) (28,236) (19,315)
Total $ (29,316) $ (29,316) $ (24,245)
Unrealized Loss Position, Number of Positions [Abstract]      
Less than 12 months | Position 31 31 149
12 months or longer | Position 193 193 76
Total | Position 224 224 225
US Government Agencies Debt Securities and US Government-sponsored Enterprises Debt Securities [Member]      
Unrealized Loss Position, Number of Positions [Abstract]      
Held-to-maturity debt securities, percentage   66.00% 70.00%