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Premises and Equipment - Components of Premises and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property Plant And Equipment [Line Items]    
Cost $ 517,918 $ 520,825
Accumulated Depreciation and Amortization (318,525) (321,130)
Net Book Value 199,393 199,695
Premises    
Property Plant And Equipment [Line Items]    
Cost 366,205 370,268
Accumulated Depreciation and Amortization (226,515) (237,024)
Net Book Value 139,690 133,244
Equipment    
Property Plant And Equipment [Line Items]    
Cost 145,120 143,964
Accumulated Depreciation and Amortization (87,649) (79,817)
Net Book Value 57,471 64,147
Finance leases    
Property Plant And Equipment [Line Items]    
Cost 6,593 6,593
Accumulated Depreciation and Amortization (4,361) (4,289)
Net Book Value $ 2,232 $ 2,304