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Premises and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Premises and equipment    
Cost $ 100,582 $ 100,430
Accumulated Depreciation/Amortization 61,605 60,818
Net Book Value 38,977 39,612
Land    
Premises and equipment    
Cost 16,141 16,318
Net Book Value 16,141 16,318
Buildings    
Premises and equipment    
Cost 41,409 42,627
Accumulated Depreciation/Amortization 21,966 22,240
Net Book Value 19,443 20,387
Leasehold improvements    
Premises and equipment    
Cost 157 74
Accumulated Depreciation/Amortization 86 73
Net Book Value 71 1
Furniture and equipment    
Premises and equipment    
Cost 42,875 41,411
Accumulated Depreciation/Amortization 39,553 38,505
Net Book Value $ 3,322 $ 2,906