Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Securities held to maturity, fair value	$ 401,405	$ 401,405	$ 439,581
Loans, allowance for loan losses	34,434	34,434	33,914
Debt issuance costs	$ 763	$ 763	$ 798
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000	50,000,000
Common stock, shares issued	16,099,556	16,099,556	16,056,178
Treasury stock, shares	104,859	104,859	127,580
Series A 3% Preferred Stock [Member]
Preferred stock, par value	$ 100	$ 100	$ 100
Preferred stock, shares authorized	1,533	1,533	1,533
Preferred stock, shares issued	1,435	1,435	1,435
Preferred stock, dividend percentage	3.00%	3.00%	3.00%
Series B-1 8.48% Preferred Stock [Member]
Preferred stock, par value	$ 100	$ 100	$ 100
Preferred stock, shares authorized	200,000	200,000	200,000
Preferred stock, shares issued	171,847	171,847	171,847
Preferred stock, dividend percentage	8.48%	8.48%	8.48%