Consolidated Statement of Changes in Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Purchase of treasury shares (in shares)	436,619	142,405
Dividends on common share (in dollars per share)	$ 0.84	$ 0.84	$ 0.84
Common Stock [Member]
Shares issued in acquisition of Empire Bancorp, Inc. (in shares)		2,557,028
Common shares released from Employee Benefit Trust, shares (in shares)	22,936	145,447	154,746
Restricted stock unit awards vested, shares (in shares)	261,628	281,636	297,559
Exercise of stock options, shares (in shares)			300
Treasury Stock [Member]
Purchase of treasury shares (in shares)	436,619	142,405	40,000
Repurchase of shares to satisfy tax obligation, shares (in shares)	74,510	77,611	84,290