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Accumulated Other Comprehensive Income - Accumulated Other Comprehensive Income (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 [Line Items]        
Net unrealized gain (loss), tax expense (benefit) $ 392,000 $ 713,000 $ 960,000 $ 1,048,000
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period 49,451,000 43,953,000 48,375,000 40,958,000
Other net changes 793,000 2,318,000 3,050,000 3,513,000
Balance at end of period 49,384,000 47,215,000 49,384,000 47,215,000
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (12,591,000) (16,936,000) (14,848,000) (18,131,000)
Other net changes 793,000 2,318,000 3,050,000 3,513,000
Balance at end of period (11,798,000) (14,618,000) (11,798,000) (14,618,000)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent        
Accumulated Other Comprehensive Income [Line Items]        
Net unrealized gain (loss), tax expense (benefit) 173,000 577,000 542,000 654,000
Other reclassifications included in other revenue, tax expense (benefit) 2,000 2,000 12,000 7,000
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized gain (loss), net of tax expense (benefit) 419,000 1,857,000 1,728,000 2,153,000
Other reclassifications included in other revenue, net of tax expense (benefit) 8,000 8,000 38,000 23,000
Amortization of Held to Maturity Securities Transferred from Available for Sale Attributable to Parent        
Accumulated Other Comprehensive Income [Line Items]        
Net unrealized gain (loss), tax expense (benefit) 207,000 134,000 396,000 387,000
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other net changes 338,000 442,000 1,248,000 1,336,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Accumulated Other Comprehensive Income [Line Items]        
Net unrealized gain (loss), tax expense (benefit) 3,000   (1,000)  
Reclassifications, tax expense (benefit) 7,000   11,000  
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized gain (loss), net of tax expense (benefit) 8,000   (3,000)  
Other reclassifications included in other revenue, net of tax expense (benefit) 21,000   34,000  
Other Accumulated Other Comprehensive Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other net changes (1,000) 11,000 5,000 1,000
Other Accumulated Other Comprehensive Income | Maximum        
Accumulated Other Comprehensive Income [Line Items]        
Net unrealized gain (loss), tax expense (benefit) $ 500 $ 500 $ 500 $ 500