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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	$ 96,951	$ 112,633	$ 118,387
Unrealized gains and losses on available for sale debt securities:
Net unrealized gains (losses) arising during the period	14,944	18,351	(6,129)
Reclassification adjustment for gains (losses) included in net income	0	0	0
Total	14,944	18,351	(6,129)
Unrealized (losses) gains on derivatives (cash flow hedges)	(5,269)	(579)
Unrealized (losses) gains on derivatives (cash flow hedges)			221
Amortization related to post-retirement obligations	4,159	(1,615)	1,221
Total other comprehensive income (loss)	13,834	16,157	(4,687)
Total comprehensive income	$ 110,785	$ 128,790	$ 113,700

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