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Accumulated other comprehensive income table (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Prior Period Reclassification Adjustment     $ 1,553
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ 2,183 $ 40,695 18,169
Total other comprehensive income (loss) (165,267) (38,512) 22,526
Ending Balance (163,084) 2,183 40,695
Unrealized Gain (Loss) on Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (9,667) 13,255 4,398
Total other comprehensive income (loss) (118,990) (22,922) 8,857
Ending Balance (128,657) (9,667) 13,255
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Total other comprehensive income (loss) (50,767)    
Unrealized Gain (Loss) on Cash Flow Hedge      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 14,137 33,276 16,479
Total other comprehensive income (loss)   (19,139) 16,797
Ending Balance (36,630) 14,137 33,276
Defined Benefit Postretirement Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (2,287) (5,836) (2,708)
Total other comprehensive income (loss) 4,490 3,549 (3,128)
Ending Balance 2,203 (2,287) (5,836)
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Total other comprehensive income (loss) $ (165,267) $ (38,512) $ 22,526