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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, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
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   12,800 $ 10,200 14,900
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans   20,800 4,900 5,600
Troubled debt restructurings   33,600 $ 15,100 20,500
Allowance for Loan and Lease Losses Period Increase Decrease Due to Trouble Debt Restructuring $ 0 147    
Reduction in specific reserve allocations   125    
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