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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Identified intangible assets      
Carrying Amount $ 60,697 $ 60,697  
Accumulated Amortization 60,697 60,672  
Total identified intangibles, Net   25  
Amortization expense 25 128 $ 644
Changes in carrying amount of goodwill 0 0  
Core deposit premium      
Identified intangible assets      
Carrying Amount 58,675 58,675  
Accumulated Amortization 58,675 58,650  
Total identified intangibles, Net   25  
Identified intangible (contract rights)      
Identified intangible assets      
Carrying Amount 2,022 2,022  
Accumulated Amortization $ 2,022 $ 2,022