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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
Net income $ 305,072 $ 281,025 $ 102,273
Available-for-sale debt securities:      
Net unrealized holding (losses) gains on debt securities (718,582) (143,115) 61,791
Reclassification adjustment for provision for credit loss expense 0 0  
Reclassification adjustment for net gains included in net income on sales 0 0 (13,198)
Defined benefit plans adjustments:      
Net actuarial (loss) gain (2,199) 3,660 (270)
Reclassification adjustment for amortization of net actuarial loss 2 1 0
Other comprehensive (loss) income for the year, net of tax (720,779) (139,454) 48,691
Total comprehensive (loss) income (415,707) 141,571 150,964
Income tax effect of items included in other comprehensive (loss) income:      
Net actuarial (loss) gain 1,319 (2,199) 162
Reclassification adjustment for amortization of net actuarial loss (1) 0 0
Total income tax effect of items included in other comprehensive (loss) income $ 1,318 $ (2,199) 162
Accounting Standards Update 2016-13 [Member]      
Available-for-sale debt securities:      
Reclassification adjustment for provision for credit loss expense     $ 368