Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Securities held to maturity, fair value	$ 136,237	$ 139,171
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
Treasury stock, shares	322,942	324,534
Deferred compensation arrangements, shares	285,832	308,670
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