Subordinated Debentures (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
NYM Preferred Trust I
Subordinated Borrowing [Line Items]
Principal value of trust preferred securities	$ 25,000,000	$ 25,000,000
Interest Rate	Three month LIBOR plus 3.75%, resetting quarterly	Three month LIBOR plus 3.75%, resetting quarterly
Scheduled maturity	March 30, 2035	March 30, 2035
NYM Preferred Trust II
Subordinated Borrowing [Line Items]
Principal value of trust preferred securities	$ 20,000,000	$ 20,000,000
Interest Rate	Three month LIBOR plus 3.95%, resetting quarterly	Three month LIBOR plus 3.95%, resetting quarterly
Scheduled maturity	October 30, 2035	October 30, 2035
Three-Month LIBOR | NYM Preferred Trust I
Subordinated Borrowing [Line Items]
Basis spread on variable rate (as a percent)	3.75%	3.75%
Three-Month LIBOR | NYM Preferred Trust II
Subordinated Borrowing [Line Items]
Basis spread on variable rate (as a percent)	3.95%	3.95%