Debt Schedule of Short Term Debt (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Federal Home Loan Bank Overnight Advances	$ 123,000,000	$ 82,000,000
Short-term Borrowings	158,836,000	105,173,000
Overnight Advances from the Federal Home Loan Bank of New York [Member]
Short-term Debt [Line Items]
Federal Home Loan Bank Overnight Advances	123,000,000	82,000,000
Maximum Borrowing Capacity	445,805,000	396,956,000
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Short-term Borrowings	35,836,000	23,173,000
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Maximum Borrowing Capacity	35,000,000	35,000,000
Federal Reserve Bank of New York [Member]
Short-term Debt [Line Items]
Maximum Borrowing Capacity	$ 370,136,000	$ 319,623,000