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Stockholders' Equity - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period   $ 2,134,505,000 $ 2,121,243,000 $ 2,019,328,000
Change in unrealized net holding gains (losses) on securities AFS   76,440,000 (13,752,000) 32,543,000
Change in unrealized net holding (losses) gains on interest rate contracts used in cash flow hedges   (1,354,000) (10,312,000) 17,024,000
Reclassification adjustments for net losses (gains) realized in net income   36,640,000 (8,710,000) (12,514,000)
Tax effect   (32,161,000) 9,640,000 (10,934,000)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total   79,565,000 (23,134,000) 26,119,000
Balance at end of period   2,283,268,000 2,134,505,000 2,121,243,000
Reclassification from AOCI, Debt Securities transferred from AFS to HTM amortization of unrealized losses, before tax   3,500,000 3,800,000 3,500,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax   (4,600,000) (11,300,000) (16,300,000)
Debt Securities, Available-for-Sale, Gain (Loss) $ 38,900,000 37,700,000 (936,000)  
AOCI Attributable to Parent [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period   (227,872,000) (204,738,000) (230,857,000)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total   79,565,000 (23,134,000) 26,119,000
Balance at end of period   $ (148,307,000) $ (227,872,000) $ (204,738,000)