Capital - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 30, 2021	Jan. 31, 2021	Mar. 04, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Announcement of common stock repurchase program						$ 25,000,000
Stock repurchased (in shares)		2,761,504
Average price per share		$ 9.07
Shareholders' equity	$ 1,109,372,000	$ 1,068,617,000	$ 1,055,665,000				$ 975,389,000
Increase (decrease) in equity	40,800,000
Net Income	138,257,000	73,447,000	105,333,000
Payments of dividends	43,611,000	42,982,000	39,394,000
Purchase of treasury stock	$ 31,301,000	$ 20,905,000	$ 6,259,000
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.455	$ 0.440	$ 0.400
Borrowings	$ 0	$ 0	$ 0
Treasury stock reissued	2,264,000	1,817,000	2,744,000
Dividends, Common Stock, Cash	(43,611,000)	(42,982,000)	(39,394,000)
Treasury Stock, Value, Acquired, Cost Method	(31,301,000)	(20,905,000)	(6,259,000)
Total other comprehensive (loss) Income	$ (26,001,000)	$ 11,654,000	$ 16,920,000
2021 Share Repurchase Plan 1
Subsequent Event [Line Items]
Announcement of common stock repurchase program					$ 25,000,000
Stock repurchased (in shares)	1,161,056
Average price per share	$ 13.44
2021 Share Repurchase Plan 2
Subsequent Event [Line Items]
Announcement of common stock repurchase program				$ 25,000,000
Stock repurchased (in shares)	937,670
Average price per share	$ 15.39