Balance Sheet Parenthetical (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Held-to-Maturity Securities, at Fair Value	$ 259,562	$ 248,252	$ 207,779
Preferred Stock, Par Value, in Dollars Per Share	$ 5	$ 5	$ 5
Preferred Stock, Shares Authorized, in Shares	1,000,000	1,000,000	1,000,000
Common Stock, Par Value, in Dollars Per Share	$ 1	$ 1	$ 1
Common Stock, Shares Authorized, in Shares	20,000,000	20,000,000	20,000,000
Common Stock, Shares Issued, in Shares	16,416,163	16,416,163	16,094,277
Unallocated ESOP Shares, in Shares	95,172	102,890	109,939
Treasury Stock, in Shares	4,310,578	4,288,617	4,223,687