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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Consolidated Statements of Comprehensive Income      
Net income $ 120,632 $ 186,483 $ 178,871
Unrealized gains (losses) on available-for-sale securities:      
Unrealized holding gains (losses) arising during period 47,401 36,211 (17,322)
Tax effect (11,544) (7,966) 3,843
Reclassification adjustment for (gains) losses included in net income (50) 2,655 655
Tax effect 11 (584) (145)
Net of tax amount 35,818 30,316 (12,969)
Unrealized gains (losses) on derivative financial instruments qualifying as cash flow hedges:      
Unrealized holding (losses) gains arising during period (33,512) (13,394) 42
Tax effect 7,372 2,947 (9)
Reclassification adjustment for losses (gains) 47,303 (349) 155
Tax effect (10,407) 77 (34)
Net of tax amount 10,756 (10,719) 154
Change in pension plan and retiree medical plan obligation:      
Change in pension and retiree medical plan obligation during period (160) 25 490
Tax effect 41 (5) (108)
Reclassification adjustment for changes included in net income 152 8,053 1,187
Tax effect (35) (1,772) (261)
Net of tax amount (2) 6,301 1,308
Other comprehensive income (loss), net of tax 46,572 25,898 (11,507)
Comprehensive income $ 167,204 $ 212,381 $ 167,364