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Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2021	Jun. 30, 2019	Jan. 31, 2019
Stock repurchase program
Stock Repurchased During Period, Value		$ 1,053	$ 7,716	$ 2,486
CSFL
Stock repurchase program
Stock Repurchased During Period, Shares			86,263
Stock Repurchased During Period, Value			$ 5,200
Announced stock repurchase program
Stock repurchase program
Stock Repurchased During Period, Value	$ 24,700	$ 146,400
Other stock repurchase arrangements
Stock repurchase program
Stock Repurchased During Period, Shares		13,412	122,708	35,674
Stock Repurchased During Period, Value		$ 1,100	$ 7,700	$ 2,500
2019 Stock Repurchase Program
Stock repurchase program
Shares authorized under repurchase program						2,000,000	1,000,000
Stock Repurchased During Period, Shares			320,000
Average price per share			$ 77.23
Stock Repurchased During Period, Value			$ 24,700
2021 Stock Repurchase Plan
Stock repurchase program
Shares authorized under repurchase program		1,682,059			3,500,000
Stock Repurchased During Period, Shares		1,817,941
Average price per share		$ 80.51

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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