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Accumulated Other Comprehensive Income - AOCI Components Pre Post & Tax Effect (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income Loss [Line Items]        
Net Unrealized Gains Arising During the Period, net $ 14,646 $ 4,427 $ 35,221 $ 12,807
Reclassification from AOCI, net 4,557 4,793 8,974 9,520
Other Comprehensive Income, before tax 26,128 12,546 60,130 30,382
Other Comprehensive Income, tax 6,925 3,326 15,935 8,055
Other Comprehensive Income 19,203 9,220 44,195 22,327
Net Unrealized Gains on Investment Securities        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other Comprehensive Income, before tax 25,811 12,316 59,498 29,922
Other Comprehensive Income, tax 6,841 3,264 15,768 7,932
Other Comprehensive Income 18,970 9,052 43,730 21,990
Investment Securities-Available-for-Sale        
Accumulated Other Comprehensive Income Loss [Line Items]        
Net Unrealized Gains Arising During the Period, before tax 19,927 6,022 47,920 17,426
Net Unrealized Gains Arising During the Period, tax 5,281 1,595 12,699 4,619
Net Unrealized Gains Arising During the Period, net 14,646 4,427 35,221 12,807
Reclassification from AOCI, net 0 0 0 0
Other Comprehensive Income 14,646 4,427 35,221 12,807
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 5,884 6,294 11,578 12,496
Reclassification from AOCI, tax 1,560 1,669 3,069 3,313
Reclassification from AOCI, net 4,324 4,625 8,509 9,183
Other Comprehensive Income 4,324 4,625 8,509 9,183
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 233 168 465 337
Other Comprehensive Income, before tax 317 230 632 460
Other Comprehensive Income, tax 84 62 167 123
Other Comprehensive Income 233 168 465 337
Amortization of Net Actuarial Losses        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other Comprehensive Income, before tax 378 291 755 582
Other Comprehensive Income, tax 100 78 200 155
Other Comprehensive Income 278 213 555 427
Amortization of Prior Service Credit        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other Comprehensive Income, before tax (61) (61) (123) (122)
Other Comprehensive Income, tax (16) (16) (33) (32)
Other Comprehensive Income $ (45) $ (45) $ (90) $ (90)