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Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | $ 2,616,828 | $ 2,342,176
Ending Balance | 2,629,655 | 2,285,748
Unrealized Gains (Losses) on Investment Securities |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | 81,604 | 14,864
OCI before reclassifications | (39,999) | 17,431
Amounts reclassified from AOCI | 377 | (36)
Ending Balance | 43,769 | 33,054
Net Unrealized (Loss) on Interest Rate Swaps used in Cash Flow Hedges |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | 0 | 0
OCI before reclassifications | 0 | 0
Amounts reclassified from AOCI | (1,707) | 0
Ending Balance | (1,707) | 0
Unrecognized Pension and Postretirement Plan Income (Costs) |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | (16,513) | (15,001)
OCI before reclassifications | 0 | 0
Amounts reclassified from AOCI | 289 | 255
Ending Balance | (16,224) | (14,746)
Total |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Beginning Balance | 65,091 | (137)
OCI before reclassifications | (39,999) | 17,431
Amounts reclassified from AOCI | (1,042) | 219
Ending Balance | 25,838 | 18,308
Reclassification out of Accumulated Other Comprehensive Income |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Amounts reclassified from AOCI | 1,787 | 795
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Amounts reclassified from AOCI | 1,787 | 795
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized (Loss) on Interest Rate Swaps used in Cash Flow Hedges |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Amounts reclassified from AOCI | 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 AOCI | $ 0 | $ 0

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