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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Reclassification Adjustment out of AOCI [Abstract]        
Interest income (expense) $ 94,478 $ 77,674 $ 262,411 $ 235,907
Other noninterest expense 5,021 6,232 13,815 14,405
Income tax (benefit) 11,499 11,043 33,598 34,193
Net income 38,973 37,433 115,874 117,575
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Total reclassifications during the period, net of tax 232 369 712 1,088
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Income tax (benefit) (31) (38) (98) (109)
Net income 94 111 295 325
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) 125 149 393 434
Net Unrealized Losses on Cash Flow Hedges Reclassified to Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Interest income (expense) 0 0 0 21
Income tax (benefit) 0 0 0 (5)
Net income 0 0 0 16
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Income tax (benefit) (47) (86) (140) (249)
Net income 138 258 417 747
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Other noninterest expense 156 317 470 913
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of AOCI [Abstract]        
Other noninterest expense $ 29 $ 27 $ 87 $ 83