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Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 1,695,162 $ 1,640,080 $ 1,690,596 $ 1,597,703
Current - period other comprehensive income (loss) 11,621 (14,347) 1,151 2,552
Ending balance 2,555,646 1,642,471 2,555,646 1,642,471
Accumulated Other Comprehensive (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (151,585) (148,146) (141,115) (165,045)
Current - period other comprehensive income (loss) 11,621 (14,347) 1,151 2,552
Ending balance (139,964) (162,493) (139,964) (162,493)
Unrealized Losses on Available for Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (164,446) (165,750) (154,489) (186,614)
Current - period other comprehensive income (loss) 13,617 (14,726) 3,660 6,138
Ending balance (150,829) (180,476) (150,829) (180,476)
Post- Retirement Obligations        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 3,108 1,303 3,937 1,572
Current - period other comprehensive income (loss) (355) (261) (1,184) (530)
Ending balance 2,753 1,042 2,753 1,042
Unrealized Gains on Derivatives (cash flow hedges)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 9,753 16,301 9,437 19,997
Current - period other comprehensive income (loss) (1,641) 640 (1,325) (3,056)
Ending balance $ 8,112 $ 16,941 $ 8,112 $ 16,941