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Premises and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Premises and equipment    
Cost $ 100,689 $ 100,581
Accumulated Depreciation/Amortization 63,061 61,604
Net Book Value 37,628 38,977
Land    
Premises and equipment    
Cost 16,124 16,141
Net Book Value 16,124 16,141
Buildings    
Premises and equipment    
Cost 41,499 41,409
Accumulated Depreciation/Amortization 22,935 21,966
Net Book Value 18,564 19,443
Leasehold improvements    
Premises and equipment    
Cost 156 156
Accumulated Depreciation/Amortization 144 86
Net Book Value 12 70
Furniture and equipment    
Premises and equipment    
Cost 42,910 42,875
Accumulated Depreciation/Amortization 39,982 39,552
Net Book Value $ 2,928 $ 3,323