Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets
Available-for-sale Securities, Amortized Cost	$ 341,023	$ 288,232
Held-to-maturity Securities, Fair Value	$ 1,365	$ 2,729
Common Stock, Par or Stated Value Per Share	$ 0.625	$ 0.625
Common Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Shares, Issued	3,338,814	3,293,687
Common Stock, Shares, Outstanding	3,174,245	3,129,118
Treasury Stock, Shares	164,569	164,569