Loans and the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Receivables [Abstract]
Non Accrual Contractual Due	90 days
Loans Pledged as Collateral	$ 2,500,000		$ 2,300,000
Loans performing under the restructured terms	16,300		11,200
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	22,800		23,300
Troubled debt restructurings	39,100		$ 34,500
Specific allowance	162	$ 147
Value of taxi medallion loans Included in the commercial loan segment of the troubled debt restructurings	$ 11,200