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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of AOCI [Abstract]        
Net securities (gains) losses $ (183) $ (148) $ (9,822) $ (914)
Interest income (expense) 94,895 94,478 279,046 262,411
Other noninterest expense 6,514 5,021 17,284 13,815
Income tax (benefit) 7,095 11,499 25,339 33,598
Net income 24,606 38,973 88,336 115,874
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Total reclassifications during the period, net of tax 565 232 8,792 712
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Income tax (benefit) (26) (31) (2,445) (98)
Net income 79 94 7,333 295
Losses on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Net securities (gains) losses     9,450 0
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 (expense) 105 125 328 393
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Income tax (benefit) (162) (47) (487) (140)
Net income 486 138 1,459 417
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Other noninterest expense 638 156 1,918 470
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Other noninterest expense $ 10 $ 29 $ 28 $ 87