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Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 190,739 $ 216,769 $ 190,203
Other comprehensive income:      
Net unrealized gains (losses) on available-for-sale securities 79,036 (30,627) 14,478
Net noncredit portion of other-than-temporary impairment gains on held-to-maturity securities 53,118 29,064 34,161
Net unrealized (losses) gains relating to hedging activities (913)    
Net unrealized (losses) gains relating to hedging activities   11,317 7,751
Pension and postretirement benefits (1,531) 679 184
Total other comprehensive income 129,710 10,433 56,574
Comprehensive income $ 320,449 $ 227,202 $ 246,777