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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, 2018
USD ($)
property
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2018
USD ($)
property
loan
Jun. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
property
Receivables [Abstract]          
Number of loans modified by troubled debt restructuring | loan 1 3 1 3  
Pre-modification outstanding recorded investment $ 514 $ 637 $ 306 $ 673  
Number of loans with subsequent default | loan 0 0      
Financing Receivable, Modifications [Line Items]          
Foreclosed real estate $ 3,414   3,414   $ 2,275
Carrying value of collateralized consumer loans $ 1,137,551   $ 1,137,551   $ 821,662
Residential Real Estate          
Financing Receivable, Modifications [Line Items]          
Number of foreclosed properties | property 5   5   1
Foreclosed real estate $ 1,200   $ 1,200   $ 179
Consumer and Other          
Financing Receivable, Modifications [Line Items]          
Carrying value of collateralized consumer loans $ 1,400   $ 1,400   $ 180