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Other Comprehensive (Loss) Income (Components of AOCI) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance $ 1,640,080 $ 1,621,131 $ 1,597,703 $ 1,697,096
Current - period other comprehensive (loss) (14,347) (43,853) 2,552 (118,662)
Ending Balance 1,642,471 1,585,265 1,642,471 1,585,265
Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (148,146) (67,946) (165,045) 6,863
Current - period other comprehensive (loss) (14,347) (43,853) 2,552 (118,662)
Ending Balance (162,493) (111,799) (162,493) (111,799)
Unrealized Losses on Available for Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (165,750) (85,182) (186,614) (211)
Current - period other comprehensive (loss) (14,726) (45,775) 6,138 (130,746)
Ending Balance (180,476) (130,957) (180,476) (130,957)
Post- Retirement Obligations        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance 1,303 2,705 1,572 2,981
Current - period other comprehensive (loss) (261) (236) (530) (512)
Ending Balance 1,042 2,469 1,042 2,469
Unrealized Gains on Derivatives (cash flow hedges)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance 16,301 14,531 19,997 4,093
Current - period other comprehensive (loss) 640 2,158 (3,056) 12,596
Ending Balance $ 16,941 $ 16,689 $ 16,941 $ 16,689