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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 81,477	$ 92,046	$ 89,289
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	18,729	22,230	(10,179)
Tax (expense) benefit	(4,304)	(5,157)	2,379
Reclassification to realized (gains) losses	(8,024)	(97)	0
Tax expense (benefit)	1,844	22	0
Postretirement plans:
Net gain (loss) arising during period	589	(686)	(41)
Tax (expense) benefit	(135)	158	10
Amortization of unrecognized net actuarial loss	686	814	21
Tax benefit	(158)	(200)	(5)
Other comprehensive income (loss)	9,227	17,084	(7,815)
Comprehensive income	$ 90,704	$ 109,130	$ 81,474

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