Balance Sheet Parenthetical (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Mar. 31, 2014
Held-to-Maturity Securities, at Fair Value	$ 324,009	$ 308,566	$ 302,567
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	17,420,776	17,079,376	17,079,376
Unallocated ESOP Shares, in Shares	55,185	71,748	71,740
Treasury Stock, in Shares	4,460,654	4,386,001	4,402,932