XML 110 R100.htm IDEA: XBRL DOCUMENT v3.24.0.1
Shareholders' Equity - Change in AOCI Components Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period $ 1,316,995 $ 1,611,611 $ 1,374,507
Other Comprehensive Income (Loss) 37,970 (368,276) (74,204)
Balance at End of Period 1,414,242 1,316,995 1,611,611
Unrealized Gains and Losses on Net Investment Securities | Available-for-sale Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (240,783) (32,940) 51,495
Other Comprehensive Income (Loss) Before Reclassifications 13,031 (384,543) (81,644)
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity   176,700  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 3,345   (2,791)
Other Comprehensive Income (Loss) 16,376 (207,843) (84,435)
Balance at End of Period (224,407) (240,783) (32,940)
Unrealized Gains and Losses on Net Investment Securities | Held-to-maturity Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (168,797) 54 (423)
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity   (176,700)  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 19,776 7,849 477
Other Comprehensive Income (Loss) 19,776 (168,851) 477
Balance at End of Period (149,021) (168,797) 54
Defined Benefit Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (25,078) (33,496) (43,250)
Other Comprehensive Income (Loss) Before Reclassifications 1,447 7,000 7,968
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 371 1,418 1,786
Other Comprehensive Income (Loss) 1,818 8,418 9,754
Balance at End of Period (23,260) (25,078) (33,496)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (434,658) (66,382) 7,822
Other Comprehensive Income (Loss) Before Reclassifications 14,478 (377,543) (73,676)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 23,492 9,267 (528)
Other Comprehensive Income (Loss) 37,970 (368,276) (74,204)
Balance at End of Period $ (396,688) $ (434,658) $ (66,382)