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Premises and Equipment, Net of Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Premises and Equipment, Net of Accumulated Depreciation    
Accumulated depreciation $ (119,748) $ (110,696)
Premises and equipment, net 176,198 194,030
Land    
Premises and Equipment, Net of Accumulated Depreciation    
Premises and equipment, gross 29,648 30,108
Office buildings and construction in progress    
Premises and Equipment, Net of Accumulated Depreciation    
Premises and equipment, gross 173,886 187,787
Furniture, fixtures and equipment    
Premises and Equipment, Net of Accumulated Depreciation    
Premises and equipment, gross 84,559 78,803
Leasehold improvements    
Premises and Equipment, Net of Accumulated Depreciation    
Premises and equipment, gross $ 7,853 $ 8,028