Balance Sheet Parenthetical (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2014
Held-to-Maturity Securities, at Fair Value	$ 324,337	$ 325,930	$ 312,500
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	17,420,776	17,079,376
Unallocated ESOP Shares, in Shares	47,090	55,275	63,723
Treasury Stock, in Shares	4,402,128	4,426,072	4,380,293