v3.26.1
Investment Securities (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale $ 1,262,007,000 $ 1,262,007,000   $ 688,668,000
Debt Securities, Available-for-sale, Unrealized Loss Position 1,059,037,000 1,059,037,000   500,500,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 49,378,000 49,378,000   44,103,000
Securities Available-for-Sale, 12 months or longer, Fair value 390,542,000 390,542,000   452,648,000
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0   0
Debt Securities, Available-for-sale, Amortized Cost 1,308,220,000 $ 1,308,220,000   729,612,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%    
Debt securities available for sale, securities sold 0   $ 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff   $ 0 $ 0  
Gain on Sale of Investments   2,700,000    
Loss on Sale of Investments   1,600,000    
Debt securities available for sale, securities sold at a gain   364,800,000    
Debt securities available for sale, securities sold at a loss   217,300,000    
U.S. Government Sponsored Entities Asset-Backed Securities [Member]        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale 821,094,000 821,094,000   399,964,000
Debt Securities, Available-for-sale, Unrealized Loss Position 780,588,000 780,588,000   356,698,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 38,257,000 38,257,000   33,229,000
Securities Available-for-Sale, 12 months or longer, Fair value 294,724,000 294,724,000   335,095,000
Debt Securities, Available-for-sale, Amortized Cost 858,811,000 858,811,000   432,051,000
USGovernmentSponsored asset backed securities and US Treasury obligations        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 38,800,000 38,800,000    
Collateral Pledged [Member]        
Schedule of Investments [Line Items]        
Debt Securities, Available-for-sale, Restricted $ 1,100,000,000 $ 1,100,000,000   $ 569,500,000