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Investment Securities - Narrative (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Investment securities available-for-sale $ 1,688,768,000 $ 895,034,000  
Debt securities, unrealized gain (loss) (27,500,000) (69,400,000)  
AFS, debt securities, unrealized loss position $ 552,922,000 $ 705,274,000  
Percentage of securities in unrealized loss positions, available-for-sale securities 32.70% 78.80%  
AFS, debt securities, unrealized loss position, accumulated loss $ 44,650,000 $ 70,222,000  
Debt Securities, Available For Sale, Accrued Interest, After Allowance For Credit Loss, Statement of Financial Position Extensible List Not Disclosed Flag Accrued interest receivables Accrued interest receivables  
Accrued interest receivable $ 7,200,000 $ 4,100,000  
Number of days past due to be placed in nonaccrual status 90 days    
Payments to acquired AFS debt securities $ 33,126,000 148,476,000 $ 362,905,000
Estimated fair value of debt securities have right to call or prepay the obligations 965,200,000 118,600,000  
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities less than one year 12,400,000 4,800,000  
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities of after one year through five years 111,400,000 67,400,000  
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities after five years through ten years 157,100,000 38,900,000  
Estimated fair value of debt securities have right to call or prepay the obligations, scheduled maturities of which is after 10 years 684,300,000 7,500,000  
Proceeds from sales of investment securities available-for-sale 176,312,000 0 $ 229,981,000
Gain (loss) on sale of securities 0    
GSE debt securities excluding specified securities      
Debt Securities, Available-for-sale [Line Items]      
Investment securities available-for-sale 285,400,000 36,900,000  
US treasury and government      
Debt Securities, Available-for-sale [Line Items]      
Investment securities available-for-sale 173,677,000 176,294,000  
Debt securities, unrealized gain (loss) $ (11,800,000) $ (18,800,000)  
Available-for-sale, qualitative disclosure, number of positions | security 38 34  
Number of securities in unrealized loss positions | security 17 23  
Payments to acquired AFS debt securities $ 0 $ 0  
GSE CMOs      
Debt Securities, Available-for-sale [Line Items]      
Investment securities available-for-sale 496,600,000 55,500,000  
Debt securities, unrealized gain (loss) $ (3,900,000) $ (7,000,000.0)  
Available-for-sale, qualitative disclosure, number of positions | security 136 59  
Number of securities in unrealized loss positions | security 57 57  
Payments to acquired AFS debt securities $ 19,900,000 $ 0  
GSE mortgage-related securities      
Debt Securities, Available-for-sale [Line Items]      
Investment securities available-for-sale 325,700,000 148,300,000  
Debt securities, unrealized gain (loss) $ (8,700,000) $ (18,600,000)  
Available-for-sale, qualitative disclosure, number of positions | security 194 141  
Number of securities in unrealized loss positions | security 85 92  
Payments to acquired AFS debt securities $ 0 $ 4,100,000  
Municipal obligations      
Debt Securities, Available-for-sale [Line Items]      
Investment securities available-for-sale 240,216,000 20,254,000  
Debt securities, unrealized gain (loss) $ 8,300,000 $ (300,000)  
Available-for-sale, qualitative disclosure, number of positions | security 242 39  
Number of securities in unrealized loss positions | security 12    
Payments to acquired AFS debt securities $ 2,800,000 $ 11,700,000  
Corporate debt obligations      
Debt Securities, Available-for-sale [Line Items]      
Investment securities available-for-sale 40,023,000 12,287,000  
Debt securities, unrealized gain (loss) $ 800,000 $ 100,000  
Available-for-sale, qualitative disclosure, number of positions | security 16 4  
Number of securities in unrealized loss positions | security 2 1  
Payments to acquired AFS debt securities $ 0 $ 0  
U.S. treasury bonds      
Debt Securities, Available-for-sale [Line Items]      
Investment securities available-for-sale 412,000,000.0 481,900,000  
Debt securities, unrealized gain (loss) $ (12,200,000) $ (24,800,000)  
Available-for-sale, qualitative disclosure, number of positions | security 54 65  
Number of securities in unrealized loss positions | security 25 50  
Payments to acquired AFS debt securities $ 9,900,000 $ 132,700,000  
Foreign government obligations      
Debt Securities, Available-for-sale [Line Items]      
Investment securities available-for-sale $ 500,000 $ 499,000  
Available-for-sale, qualitative disclosure, number of positions | security 1 1  
Collateral Pledged      
Debt Securities, Available-for-sale [Line Items]      
Available for sale securities pledged as collateral $ 1,200,000,000 $ 792,000,000.0  
Outstanding borrowings $ 0 $ 0