Loans and the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Non Accrual Contractual Due	90 days
Loans Pledged as Collateral	$ 2,500,000	$ 2,300,000
Charge offs	5,076	18,011	$ 239
Loans performing under the restructured terms	21,400	11,200
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	30,600	23,300
Troubled debt restructurings	52,000	34,500
Specific allowance	$ 1,300	0
Taxi medallion loans [Member]
Financing Receivable, Impaired [Line Items]
Charge offs		$ 17,000
Number of loans	one taxi medallion loan	27 taxi medallion loans
Value of taxi medallion loans Included in the commercial loan segment of the troubled debt restructurings	$ 300	$ 11,200