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Loans and the Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]          
Non Accrual Contractual Due   90 days      
Loans Pledged as Collateral $ 2,200,000 $ 2,200,000   $ 1,900,000  
Loans performing under the restructured terms   11,200 $ 12,800 14,900 $ 13,300
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans   21,100 4,800 5,600 500
Troubled debt restructurings   32,300 $ 17,600 20,500 $ 13,800
Allowance for Loan and Lease Losses Period Increase Decrease Due to Trouble Debt Restructuring $ 0 147      
Reduction in specific reserve allocations   136      
Charge-off related to taxi medallion loan portfolio   17,000      
Commercial loans held-for-sale segment [Member]          
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]          
Loans held-for-sale net of valuation allowance       $ 17,000  
Commercial Portfolio Segment [Member]          
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]          
Allowance for Loan and Lease Losses Period Increase Decrease Due to Trouble Debt Restructuring   $ 11,200