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Securities, HTM Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Position
Dec. 31, 2023
USD ($)
Position
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 24,517 $ 26,643
12 months or longer 670,184 675,260
Total 694,701 701,903
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (560) (492)
12 months or longer (97,085) (90,522)
Total $ (97,645) $ (91,014)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 6 22
12 months or longer | Position 294 280
Total | Position 300 302
HTM debt securities, nonaccrual $ 0 $ 0
Accrued interest reversed against interest income 0 0
Collateral-dependent HTM debt securities 0 0
Allowance for credit losses on HTM securities 0 0
AIR on HTM debt securities $ 5,100 $ 4,700
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Past Due [Member]    
Unrealized Loss Position, Number of Positions [Abstract]    
HTM debt securities $ 0 $ 0
Federal Agency [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 0 0
12 months or longer 81,560 82,216
Total 81,560 82,216
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 0
12 months or longer (18,440) (17,784)
Total $ (18,440) $ (17,784)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 0
12 months or longer | Position 4 4
Total | Position 4 4
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 11,905 $ 12,221
12 months or longer 194,181 201,320
Total 206,086 213,541
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (489) (365)
12 months or longer (34,434) (31,814)
Total $ (34,923) $ (32,179)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 1 1
12 months or longer | Position 33 33
Total | Position 34 34
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 8,189 $ 0
12 months or longer 213,088 219,820
Total 221,277 219,820
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (58) 0
12 months or longer (24,614) (22,929)
Total $ (24,672) $ (22,929)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 1 0
12 months or longer | Position 52 54
Total | Position 53 54
State & Municipal [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 4,423 $ 14,422
12 months or longer 181,355 171,904
Total 185,778 186,326
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (13) (127)
12 months or longer (19,597) (17,995)
Total $ (19,610) $ (18,122)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 4 21
12 months or longer | Position 205 189
Total | Position 209 210
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%