Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Held-To-Maturity Securities, at Fair Value	$ 226,576	$ 249,618
Preferred Stock, Par Value (in dollars per share)	$ 1	$ 1
Preferred Stock, Shares Authorized (in shares)	1,000,000	1,000,000
Common Stock, Par Value (in dollars per share)	$ 1	$ 1
Common Stock, Shares Authorized (in shares)	30,000,000	30,000,000
Common Stock, Shares Issued (in shares)	20,194,474	19,606,449
Treasury Stock, Shares (in shares)	4,678,736	4,608,258