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Shareholders' Equity (Additional Information) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Jan. 03, 2022 shares	Feb. 28, 2021 shares	Jan. 31, 2020 shares	Jan. 31, 2019 shares	Oct. 08, 2015 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
number of years	2
Dividends declared to shareholders | $	$ 22,100	$ 19,800	$ 18,900
Stock Repurchase Program Expiration Date	Jan. 03, 2023
Subordinated Debt | $	$ 44,331	59,331						$ 15,000
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends declared to shareholders | $	$ 41,700	$ 39,400	$ 36,900
Share Repurchase Program Three [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stock repurchase program, shares of common stock approved for repurchase							775,000
Stock repurchased during period, shares			488,052
Shares repurchased, average cost per share | $ / shares			$ 42.61
Share Repurchase Program Four [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stock repurchase program, shares of common stock approved for repurchase						750,000
Stock repurchased during period, shares		274,354
Shares repurchased, average cost per share | $ / shares		$ 35.36
Share Repurchase Program Five
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stock repurchase program, shares of common stock approved for repurchase					750,000
Stock repurchased during period, shares	217,931
Shares repurchased, average cost per share | $ / shares	$ 46.25
Tier II Capital [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Subordinated Debt | $		$ 12,000
Subsequent Event [Member] | Share Repurchase Program Six
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stock repurchase program, shares of common stock approved for repurchase				750,000

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