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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Identified intangible assets      
Carrying Amount $ 60,697 $ 60,697  
Accumulated Amortization 60,697 60,697  
Amortization expense     $ 25
Estimated amortization expense for each of the five succeeding fiscal years and thereafter      
Changes in carrying amount of goodwill 0 0  
Core deposit premium      
Identified intangible assets      
Carrying Amount 58,675 58,675  
Accumulated Amortization 58,675 58,675  
Identified intangible (contract rights)      
Identified intangible assets      
Carrying Amount 2,022 2,022  
Accumulated Amortization $ 2,022 $ 2,022