Nature of Operations and Summary of Significant Accounting Policies - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Nature of Operations and Summary of Significant Accounting Policies
Net income and net income available to common shareholders	$ 74,627	$ 59,313	$ 73,612
Average common shares outstanding	13,558	14,043	14,201
Average common share stock options outstanding	116	61	129
Average diluted common shares	13,674	14,104	14,330
Earnings per common share - basic	$ 5.50	$ 4.22	$ 5.18
Earning per common share - diluted	$ 5.46	$ 4.21	$ 5.14