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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Statement of Comprehensive Income [Abstract]    
Net income $ 18,180 $ 22,285
Unrealized gains (losses) on securities available for sale:    
Unrealized holding gains (losses) arising during the period, pretax 20,765 5,903
Tax (expense) benefit (4,772) (1,380)
Postretirement Plans:    
Amortization of unrecognized net actuarial loss 178 228
Tax benefit (41) (54)
Other comprehensive income (loss) 16,130 4,697
Comprehensive income $ 34,310 $ 26,982