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Premises and Equipment (Schedule of Premises and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Premises and equipment, gross $ 169,099 $ 130,408
Less accumulated depreciation and amortization (52,866) (55,057)
Net book value of premises and equipment 116,233 75,351
Land [Member]    
Premises and equipment, gross 38,821 23,404
Buildings [Member]    
Premises and equipment, gross 92,337 67,032
Furniture and Equipment [Member]    
Premises and equipment, gross 35,532 37,780
Leasehold Improvements [Member]    
Premises and equipment, gross $ 2,409 $ 2,192