Balance Sheet Parenthetical (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Held-To-Maturity Securities, at Fair Value	$ 280,338	$ 335,901
Preferred Stock, Par Value (in usd per share)	$ 5	$ 5
Preferred Stock, Shares Authorized (in shares)	1,000,000	1,000,000
Common Stock, Par Value (in usd per share)	$ 1	$ 1
Common Stock, Shares Authorized (in shares)	20,000,000	20,000,000
Common Stock, Shares Issued (in shares)	19,035,565	18,481,301
Unallocated ESOP Shares (in shares)	5,001	9,643
Treasury Stock, Shares (in shares)	4,558,207	4,541,524