Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 19,039	$ (1,390)
Other comprehensive income (loss), net of tax:
Amortization of actuarial losses, net of taxes of ($36) and ($30) for the three months ended March 31, 2021 and 2020, respectively.	81	67
Amortization of prior service credits, net of taxes of $6 for each of the three months ended March 31, 2021 and 2020, respectively.	(15)	(14)
Net unrealized losses on securities, net of taxes of $986 and $4,642 for the three months ended March 31, 2021 and 2020, respectively.	(2,217)	(10,202)
Reclassification adjustment for net losses included in income, net of taxes of ($12) for the three months ended March 31, 2020.	0	25
Net unrealized gains (losses) on cash flow hedges, net of taxes of ($3,461) and $6,190 for the three months ended March 31, 2021 and 2020 respectively.	7,798	(13,605)
Change in fair value of liabilities related to instrument-specific credit risk, net of taxes of $36 and ($489) for the three months ended March 31, 2021 and 2020.	(84)	1,096
Total other comprehensive income (loss) , net of tax	5,563	(22,633)
Comprehensive income (loss)	$ 24,602	$ (24,023)