Consolidated Statements of Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Consolidated Statements of Condition
Mortgage related securities held-to-maturity, fair value (in dollars)	$ 26,638	$ 29,451
Loans, allowance for loan losses (in dollars)	$ 11,603	$ 11,170
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	12,260,172	12,356,564
Common stock, shares outstanding	12,260,172	12,356,564
Treasury stock, shares	2,350,600	2,249,600