Note 23 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				4 Months Ended		12 Months Ended
	Feb. 18, 2022	Feb. 14, 2022	Feb. 07, 2022	Dec. 31, 2021	Aug. 05, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Treasury Stock, Shares, Acquired (in shares)				2,153,576	1,832,481	3,986,057
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)				$ 42.77	$ 40.93	$ 41.92
Treasury Stock, Value, Acquired, Cost Method				$ 92,100	$ 75,000	$ 167,104	$ 23,593	$ 36,301
Subsequent Event [Member]
Dividends Payable, Amount Per Share (in dollars per share)		$ 0.34
Treasury Stock, Shares, Acquired (in shares)	704,927
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 46.67
Treasury Stock, Value, Acquired, Cost Method	$ 32,900
Dividends Payable, Date to be Paid		Mar. 07, 2022
Dividends Payable, Date of Record		Feb. 25, 2022
HSBC Bank USA West Coast Mass Market Consumer and Retail Banking Business [Member] | Subsequent Event [Member]
Business Combination, Consideration Transferred, Total			$ 5,000