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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Consolidated Statements of Comprehensive Income      
Net income $ 475,543 $ 120,632 $ 186,483
Unrealized holding (losses) gains on available for sale securities:      
Unrealized holding (losses) gains arising during period (90,350) 47,401 36,211
Tax effect 21,485 (11,544) (7,966)
Reclassification adjustment for (gains) losses included in net income (102) (50) 2,655
Tax effect 24 11 (584)
Net of tax amount (68,943) 35,818 30,316
Unrealized (losses) gains on derivative financial instruments qualifying as cash flow hedges:      
Unrealized holding losses arising during period   (33,512) (13,394)
Tax effect   7,372 2,947
Reclassification adjustment for (gains) losses included in interest expense   47,303 (349)
Tax effect   (10,407) 77
Net of tax amount   10,756 (10,719)
Change in pension plan and retiree medical plan obligation:      
Change in pension and retiree medical plan obligation during period 98 (160) 25
Tax effect (23) 41 (5)
Reclassification adjustment for changes included in net income 174 152 8,053
Tax effect (41) (35) (1,772)
Net of tax amount 208 (2) 6,301
Other comprehensive (loss) income, net of tax (68,735) 46,572 25,898
Comprehensive income $ 406,808 $ 167,204 $ 212,381