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Accumulated Other Comprehensive Income - AOCI Components Pre Post & Tax Effect (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income Loss [Line Items]        
Net Unrealized Gains Arising During the Period, net $ 18,451 $ 34,271 $ 53,672 $ 47,078
Reclassification from AOCI, net 4,492 4,730 13,466 14,250
Other Comprehensive Income, before tax 31,218 53,059 91,347 83,441
Other Comprehensive Income, tax 8,275 14,058 24,209 22,113
Other Comprehensive Income 22,943 39,001 67,138 61,328
Net Unrealized Gains on Investment Securities        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other Comprehensive Income, before tax 30,901 52,830 90,398 82,752
Other Comprehensive Income, tax 8,190 13,997 23,957 21,929
Other Comprehensive Income 22,711 38,833 66,441 60,823
Investment Securities-Available-for-Sale        
Accumulated Other Comprehensive Income Loss [Line Items]        
Net Unrealized Gains Arising During the Period, before tax 25,105 46,623 73,024 64,049
Net Unrealized Gains Arising During the Period, tax 6,654 12,352 19,352 16,971
Net Unrealized Gains Arising During the Period, net 18,451 34,271 53,672 47,078
Reclassification from AOCI, net 0 0 0 0
Other Comprehensive Income 18,451 34,271 53,672 47,078
Investment Securities-Held-to-Maturity        
Accumulated Other Comprehensive Income Loss [Line Items]        
Net Unrealized Gains Arising During the Period, net 0 0 0 0
Reclassification from AOCI 5,796 6,207 17,374 18,703
Reclassification from AOCI, tax 1,536 1,645 4,605 4,958
Reclassification from AOCI, net 4,260 4,562 12,769 13,745
Other Comprehensive Income 4,260 4,562 12,769 13,745
Defined Benefit Plans, Net        
Accumulated Other Comprehensive Income Loss [Line Items]        
Net Unrealized Gains Arising During the Period, net 0 0 0 0
Reclassification from AOCI, net 232 168 697 505
Other Comprehensive Income, before tax 317 229 949 689
Other Comprehensive Income, tax 85 61 252 184
Other Comprehensive Income 232 168 697 505
Amortization of Net Actuarial Losses        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other Comprehensive Income, before tax 378 291 1,133 873
Other Comprehensive Income, tax 100 77 300 232
Other Comprehensive Income 278 214 833 641
Amortization of Prior Service Credit        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other Comprehensive Income, before tax (61) (62) (184) (184)
Other Comprehensive Income, tax (15) (16) (48) (48)
Other Comprehensive Income $ (46) $ (46) $ (136) $ (136)