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Consolidated Statements of Comprehensive (Loss) Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Consolidated Statements of Comprehensive (Loss) Income      
Net income $ 496,049 $ 475,543 $ 120,632
Unrealized holding (losses) gains on available for sale securities:      
Unrealized holding (losses) gains arising during period (861,470) (90,350) 47,401
Tax effect 206,281 21,485 (11,544)
Reclassification adjustment for gains included in net income (30) (102) (50)
Tax effect 7 24 11
Net of tax amount (655,212) (68,943) 35,818
Unrealized gains on derivative financial instruments qualifying as cash flow hedges:      
Unrealized holding losses arising during period     (33,512)
Tax effect     7,372
Reclassification adjustment for losses included in interest expense     47,303
Tax effect     (10,407)
Net of tax amount     10,756
Change in pension plan and retiree medical plan obligation:      
Change in pension and retiree medical plan obligation during period (1,110) 98 (160)
Tax effect 272 (23) 41
Reclassification adjustment for changes included in net income 143 174 152
Tax effect (35) (41) (35)
Net of tax amount (730) 208 (2)
Other comprehensive (loss) income, net of tax (655,942) (68,735) 46,572
Comprehensive (loss) income $ (159,893) $ 406,808 $ 167,204