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Investment Securities - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 02, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available For Sale and Held to Maturity, Restricted     $ 229,200 $ 219,400  
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security     167 299  
Proceeds from sale of securities   $ 417,900 $ 1,133,470 $ 276,252 $ 0
Net gains (losses) on sales of securities available for sale   $ (38,900) $ (37,700) $ 936  
Territorial          
Debt Securities, Available-for-sale [Line Items]          
Investments, available-for-sale securities $ 18,530        
Investments, held-to-maturity securities 516,665        
Proceeds from sale of securities $ 535,200        
U.S. Government Agency and U.S. Government Sponsored Enterprises          
Debt Securities, Available-for-sale [Line Items]          
Percentage of portfolio     86.60%    
Asset-backed securities          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security     1 1  
Corporate Debt Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security     5 6  
Municipal Bonds [Member]          
Debt Securities, Available-for-sale [Line Items]          
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security     28 57