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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of AOCI [Abstract]        
Interest income $ 134,663 $ 101,669 $ 366,106 $ 294,017
Other noninterest expense 7,892 6,112 22,332 17,865
Income tax (benefit) 17,354 10,681 36,027 29,275
Net income 54,471 38,097 113,726 104,636
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Total reclassifications, net of tax 257 419 839 1,986
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Income tax (benefit) (17) (21) (53) (68)
Net income 51 66 160 206
Amortization of Unrealized Gains Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Interest income 68 87 213 274
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Income tax (benefit) (69) (118) (227) (594)
Net income 206 353 679 1,780
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Other noninterest expense 273 474 899 2,382
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Other noninterest expense $ 2 $ (3) $ 7 $ (8)