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Allowance For Loan Losses And Credit Quality Of Financing Receivables - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
loan
Dec. 31, 2016
USD ($)
Receivables [Abstract]          
Number of loans modified by troubled debt restructuring | loan 3 0 3 0  
Pre-modification outstanding recorded investment $ 637   $ 637    
Number of loans with subsequent default | loan 0 0      
Financing Receivable, Modifications [Line Items]          
Carrying value of collateralized consumer loans $ 773,217   773,217   $ 696,142
Consumer And Other [Member]          
Financing Receivable, Modifications [Line Items]          
Carrying value of collateralized consumer loans $ 640   $ 640   $ 666