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Loans and the Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]          
Non Accrual Contractual Due   90 days      
Loans held-for-sale, Carrying Amount   $ 51,124   $ 78,005  
Loans Pledged as Collateral   1,800,000   1,800,000  
Loans performing under the restructured terms   10,200 $ 97,800 13,300  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans   4,900 1,400 500  
Troubled debt restructurings   15,100 99,200 13,800  
Allowance for Loan and Lease Losses Period Increase Decrease Due to Trouble Debt Restructuring $ 1,500 $ 10,100 3,300    
Valuation per Medallion Amount 750   750    
Specific allocations associated with taxi medallion, fair value $ 7,800   7,800   $ 4,500
Increase in allowance for loan and lease losses     $ 108    
Number of loans   Eight loans were accruing prior to modification, while seven remained in accrual status post-modification.      
Commercial loans held-for-sale segment [Member]          
LOANS AND THE ALLOWANCE FOR LOAN LOSSES (Details) [Line Items]          
Loans held-for-sale, Carrying Amount   $ 50,900   65,600  
Loans held-for-sale net of valuation allowance   $ 12,300   $ 0