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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 92,046	$ 89,289	$ 45,972
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	22,230	(10,179)	639
Tax (expense) benefit	(5,157)	2,379	(234)
Reclassification to realized (gains) losses	(97)	0	235
Tax expense (benefit)	22	0	(87)
Postretirement plans:
Net (loss) gain arising during period	(686)	(41)	1,601
Tax benefit (expense)	158	10	(593)
Amortization of unrecognized net actuarial loss	814	21	211
Tax benefit	(200)	(5)	(75)
Other comprehensive income (loss)	17,084	(7,815)	1,697
Comprehensive income	$ 109,130	$ 81,474	$ 47,669

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