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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 89,289	$ 45,972	$ 27,509
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	(10,179)	639	(1,919)
Tax (expense) benefit	2,379	(234)	683
Reclassification to realized (gains) losses		235	(3)
Tax expense (benefit)		(87)	1
Postretirement plans:
Net gain (loss) arising during period	(41)	1,601	(557)
Tax (expense) benefit	10	(593)	115
Amortization of unrecognized net actuarial (gain) loss	21	211	202
Tax expense (benefit)	(5)	(75)	(79)
Other comprehensive income (loss)	(7,815)	1,697	(1,557)
Comprehensive income	$ 81,474	$ 47,669	$ 25,952

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