Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Forfeiture of restricted stock award grants (in shares)		2,699	361
Restricted stock award grants (in shares)	36,968	40,978	40,108
Performance based restricted stock award grants (in shares)	8,351	798
Issuance of common stock, net of issuance costs (in shares)	115,790	52,568
Purchase of treasury stock (in shares)	66,600	40,000	90,898
Cash dividends declared (in dollars per share)	$ 0.68	$ 0.68	$ 0.67
Cumulative-effect adjustment due to the adoption of ASU No. 2016-13	us-gaap:AccountingStandardsUpdate201613Member
Restricted Stock
Purchase of treasury stock (in shares)	7,349	10,467	6,308
Performance Based Restricted Stock Awards
Purchase of treasury stock (in shares)	3,458	294