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v3.20.1

Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | $ 2,342,176 | $ 2,247,573
Ending Balance | 2,285,748 | 2,301,019
Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | 14,864 | (44,654)
Other comprehensive income before reclassifications | 17,431 | 20,298
Amounts reclassified from accumulated other comprehensive income | (36) | (51)
Ending Balance | 33,054 | (23,433)
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | 0 | 680
Other comprehensive income before reclassifications | 0 | (82)
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Ending Balance | 0 | 598
Unrecognized Pension and Postretirement Plan Income (Costs) |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | (15,001) | (15,089)
Other comprehensive income before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive income | 255 | 291
Ending Balance | (14,746) | (14,798)
Total |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | (137) | (59,063)
Other comprehensive income before reclassifications | 17,431 | 20,216
Amounts reclassified from accumulated other comprehensive income | 219 | 240
Ending Balance | 18,308 | (37,633)
Reclassification out of Accumulated Other Comprehensive Income |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Amounts reclassified from accumulated other comprehensive income | 795 | 974
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Amounts reclassified from accumulated other comprehensive income | 795 | 974
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Reclassification out of Accumulated Other Comprehensive Income | Unrecognized Pension and Postretirement Plan Income (Costs) |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Amounts reclassified from accumulated other comprehensive income | $ 0 | $ 0

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