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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustments out of AOCI [Abstract]      
Net securities (gains) losses $ (2,789) $ 9,315 $ 1,131
Interest income 400,122 378,219 362,190
Other noninterest expense 25,659 29,684 19,795
Income tax (benefit) expense 38,817 34,677 44,161
Net Income 140,641 118,782 151,995
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustments out of AOCI [Abstract]      
Total reclassifications, net of tax 2,428 9,387 938
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustments out of AOCI [Abstract]      
Income tax (benefit) expense (89) (2,470) (128)
Net Income 267 7,407 385
Losses on AFS securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustments out of AOCI [Abstract]      
Net securities (gains) losses 0 9,450 0
Amortization of Unrealized Gains Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustments out of AOCI [Abstract]      
Interest income 356 427 513
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustments out of AOCI [Abstract]      
Income tax (benefit) expense (720) (660) (184)
Net Income 2,161 1,980 553
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustments out of AOCI [Abstract]      
Other noninterest expense 1,892 2,601 623
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustments out of AOCI [Abstract]      
Other noninterest expense $ 989 $ 39 $ 114