Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Income	$ 64,942	$ 53,017	$ 181,272	$ 159,909
Unrealized gain from securities
Net unrealized holding gain (loss) from available for sale debt securities arising during the period, net of tax	(170,224)	(22,022)	(583,072)	(102,777)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax			0	241
Amortization of net unrealized gain for the reclassification of available for sale securities to held to maturity, after Tax	2,086	465	5,242	810
Net unrealized gain (loss) from securities, net of reclassification adjustment	(172,310)	(22,487)	(588,314)	(103,828)
Pension plan liability adjustment:
Amortization of unrecognized net actuarial loss included in net periodic pension cost, net of tax	100	114	301	344
Pension plan liability adjustment, net	100	114	301	344
Unrealized gain from cash flow hedging instruments
Reclassification adjustment for net gain in cash flow hedging instruments included in income, net of tax	2,019	2,019	5,993	5,994
Net unrealized gain (loss) from cash flow hedging instruments, net of reclassification adjustment	(2,019)	(2,019)	(5,993)	(5,994)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	(174,229)	(24,392)	(594,006)	(109,478)
Total comprehensive income	$ (109,287)	$ 28,625	$ (412,734)	$ 50,431