Capital - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Oct. 31, 2021	Dec. 31, 2019
Subsequent Event [Line Items]
Shareholders' equity	$ 1,052,074,000	$ 1,109,372,000	$ 1,068,617,000		$ 1,055,665,000
Increase (decrease) in equity	(57,300,000)
Net Income	128,181,000	138,257,000	73,447,000
Payments of dividends	44,578,000	43,611,000	42,982,000
Purchase of treasury stock	$ 15,598,000	$ 31,301,000	$ 20,905,000
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.475	$ 0.455	$ 0.440
Borrowings	$ 0	$ 0	$ 0
Treasury stock reissued	2,192,000	2,264,000	1,817,000
Dividends, Common Stock, Cash	(44,578,000)	(43,611,000)	(42,982,000)
Treasury Stock, Value, Acquired, Cost Method	(15,598,000)	(31,301,000)	(20,905,000)
Total other comprehensive (loss) Income	$ (128,924,000)	$ (26,001,000)	$ 11,654,000
2021 Share Repurchase Plan 2
Subsequent Event [Line Items]
Announcement of common stock repurchase program				$ 25,000,000
Stock repurchased (in shares)	1,371,019
Average price per share	$ 13.92