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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, 2024
USD ($)
Position
Sep. 30, 2024
USD ($)
Position
Dec. 31, 2023
USD ($)
Position
Unrealized Loss Position, Fair Value [Abstract]      
Less than 12 months $ 2,908 $ 2,908 $ 26,643
12 months or longer 670,988 670,988 675,260
Total 673,896 673,896 701,903
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months (2) (2) (492)
12 months or longer (73,326) (73,326) (90,522)
Total $ (73,328) $ (73,328) $ (91,014)
Unrealized Loss Position, Number of Positions [Abstract]      
Less than 12 months | Position 3 3 22
12 months or longer | Position 277 277 280
Total | Position 280 280 302
HTM debt securities, nonaccrual $ 0 $ 0 $ 0
Accrued interest reversed against interest income 0 0 0
Collateral-dependent HTM debt securities 0 0 0
Allowance for credit losses on HTM securities 0 0 0
AIR on HTM debt securities $ 3,800 $ 3,800 $ 4,700
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 85,736 85,736 82,216
Total 85,736 85,736 82,216
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months 0 0 0
12 months or longer (14,264) (14,264) (17,784)
Total $ (14,264) $ (14,264) $ (17,784)
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 $ 0 $ 0 $ 12,221
12 months or longer 202,256 202,256 201,320
Total 202,256 202,256 213,541
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months 0 0 (365)
12 months or longer (26,871) (26,871) (31,814)
Total $ (26,871) $ (26,871) $ (32,179)
Unrealized Loss Position, Number of Positions [Abstract]      
Less than 12 months | Position 0 0 1
12 months or longer | Position 34 34 33
Total | Position 34 34 34
Collateralized Mortgage Obligations [Member]      
Unrealized Loss Position, Fair Value [Abstract]      
Less than 12 months $ 0 $ 0 $ 0
12 months or longer 208,993 208,993 219,820
Total 208,993 208,993 219,820
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months 0 0 0
12 months or longer (17,721) (17,721) (22,929)
Total $ (17,721) $ (17,721) $ (22,929)
Unrealized Loss Position, Number of Positions [Abstract]      
Less than 12 months | Position 0 0 0
12 months or longer | Position 52 52 54
Total | Position 52 52 54
State & Municipal [Member]      
Unrealized Loss Position, Fair Value [Abstract]      
Less than 12 months $ 2,908 $ 2,908 $ 14,422
12 months or longer 174,003 174,003 171,904
Total 176,911 176,911 186,326
Unrealized Loss Position, Unrealized Losses [Abstract]      
Less than 12 months (2) (2) (127)
12 months or longer (14,470) (14,470) (17,995)
Total $ (14,472) $ (14,472) $ (18,122)
Unrealized Loss Position, Number of Positions [Abstract]      
Less than 12 months | Position 3 3 21
12 months or longer | Position 187 187 189
Total | Position 190 190 210
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% 66.00%