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Accumulated Other Comprehensive Income - Accumulated Other Comprehensive Income (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 [Line Items]        
Net unrealized gain (loss), tax expense (benefit) $ 185,000 $ 185,000 $ 568,000 $ 335,000
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period 49,511,000 42,412,000 48,375,000 40,958,000
Other net changes 1,030,000 640,000 2,257,000 1,195,000
Balance at end of period 49,451,000 43,953,000 49,451,000 43,953,000
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (13,621,000) (17,576,000) (14,848,000) (18,131,000)
Other net changes 1,030,000 640,000 2,257,000 1,195,000
Balance at end of period (12,591,000) (16,936,000) (12,591,000) (16,936,000)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent        
Accumulated Other Comprehensive Income [Line Items]        
Net unrealized gain (loss), tax expense (benefit) 116,000 51,000 369,000 77,000
Other reclassifications included in other revenue, tax expense (benefit) 8,000 3,000 10,000 5,000
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized gain (loss), net of tax expense (benefit) 501,000 183,000 1,309,000 296,000
Other reclassifications included in other revenue, net of tax expense (benefit) 22,000 7,000 30,000 15,000
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) 61,000 131,000 189,000 253,000
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other net changes 500,000 452,000 910,000 894,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Accumulated Other Comprehensive Income [Line Items]        
Net unrealized gain (loss), tax expense (benefit) (4,000)   (4,000)  
Reclassifications, tax expense (benefit) 4,000   4,000  
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized gain (loss), net of tax expense (benefit) (11,000)   (11,000)  
Other reclassifications included in other revenue, net of tax expense (benefit) 13,000   13,000  
Other Accumulated Other Comprehensive Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other net changes 5,000 (2,000) 6,000 (10,000)
Other Accumulated Other Comprehensive Income | Maximum        
Accumulated Other Comprehensive Income [Line Items]        
Net unrealized gain (loss), tax expense (benefit) $ 500 $ 500 $ 500 $ 500