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Loans Receivable (Risk category of gross loans not subject to risk rating ) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Not Subject To Risk Rating [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount $ 4,284,391 $ 4,204,871
Financing Receivable, Individually Evaluated for Impairment $ 68,580 $ 72,285