Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 202,820	$ 154,244	$ 194,451
Unrealized gain (loss) from securities:
Net unrealized holding gain (loss) from available for sale debt securities arising during the period, net of tax	(137,482)	130,355	67,802
Reclassification adjustment of net gain from available for sale debt securities arising during the period, net of tax	(242)	(219)	(1,636)
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax	(2,316)	0	0
Net unrealized gain (loss) from available for sale debt securities, net of reclassification adjustment	(140,040)	130,136	66,166
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) and plan amendments during the period, net of tax	562	(2,177)	(2,042)
Amortization of unrecognized net actuarial losses included in net periodic pension cost, net of tax	(459)	(318)	(245)
Pension plan liability adjustment, net	(1,021)	1,859	1,797
Unrealized gain from cash flow hedging instruments:
Net unrealized gain in cash flow hedging instruments arising during the period, net of tax	0	20,012	11,760
Reclassification adjustment for net gain in cash flow hedging instruments included in income, net of tax	(8,014)	(6,461)	(457)
Net unrealized gain form cash flow hedging instruments, net of reclassification adjustment	(8,014)	13,551	11,303
Other comprehensive income (loss)	(147,033)	141,828	75,672
Total comprehensive income	$ 55,787	$ 296,072	$ 270,123