Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Securities held to maturity, fair value	$ 134,118	$ 454
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	6,651,760	6,651,760
Common stock, shares outstanding	6,311,332	6,282,385
Treasury stock, shares	340,428	369,375
Deferred compensation arrangements, shares	314,953	324,515
Preferred Class A Non-Voting [Member]
Preferred stock, shares authorized	200,000	200,000
Preferred stock, shares outstanding	0	0
Preferred Class B Voting [Member]
Preferred stock, shares authorized	1,500,000	1,500,000
Preferred stock, shares outstanding	0	0