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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, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]        
Non Accrual Contractual Due   90 days    
Loans held-for-sale, Carrying Amount   $ 89,386   $ 78,005
Loans Pledged as Collateral   1,900,000   1,800,000
Loans performing under the restructured terms   12,800 $ 105,300 13,300
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans   4,900 1,400 500
Troubled debt restructurings   17,600 106,700 13,800
Allowance for Loan and Lease Losses Period Increase Decrease Due to Trouble Debt Restructuring $ 5,000 $ 17,300 8,300  
Specific allocations associated with taxi medallion, fair value $ 12,500   $ 12,500  
Number of loans   Eight loans were accruing prior to modification, while seven remained in accrual status post-modification.    
Commercial Real Estate Portfolio Segment [Member]        
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]        
Loans held-for-sale, Carrying Amount   $ 41,811   7,712
Commercial loans held-for-sale segment [Member]        
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]        
Loans held-for-sale, Carrying Amount   47,400   65,600
Loans held-for-sale net of valuation allowance   $ 15,300   $ 0