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Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ (227,777) $ 77,728 $ 35,162 $ 182,195
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (152,860) 21,850 (412,848) (80,755)
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax (3,978) (2,469) (6,929) (4,331)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total (156,838) 19,381 (419,777) (85,086)
Ending balance (384,615) 97,109 (384,615) 97,109
Unrealized Gains and Losses on Available-for-Sale Debt Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (237,930) 60,569 23,134 163,174
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (152,860) 21,850 (412,848) (80,755)
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax (2,080) (586) (3,156) (586)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total (154,940) 21,264 (416,004) (81,341)
Ending balance (392,870) 81,833 (392,870) 81,833
Unrealized Gains and Losses on Pension Plan Liability [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (4,711) (5,718) (4,812) (5,833)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0 0 0
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax 100 115 201 230
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total 100 115 201 230
Ending balance (4,611) (5,603) (4,611) (5,603)
Unrealized gains and losses on cash flow hedge        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 14,864 22,877 16,840 24,854
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0 0 0
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax (1,998) (1,998) (3,974) (3,975)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total (1,998) (1,998) (3,974) (3,975)
Ending balance $ 12,866 $ 20,879 $ 12,866 $ 20,879