v3.26.1
Securities - Schedule of Debt Securities (Details) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 4,400,498,000 $ 4,143,163,000  
Unrealized Gains 10,642,000 29,609,000  
Unrealized Losses (363,312,000) (347,203,000)  
Allowance for Credit Losses 0 0 $ 0
Fair Value 4,047,828,000 3,825,569,000  
Government-sponsored residential mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 3,043,549,000 2,753,311,000  
Unrealized Gains 7,498,000 19,846,000  
Unrealized Losses (256,210,000) (239,848,000)  
Allowance for Credit Losses 0 0  
Fair Value 2,794,837,000 2,533,309,000  
Government-sponsored commercial mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 1,120,536,000 1,148,394,000  
Unrealized Gains 3,061,000 9,388,000  
Unrealized Losses (99,087,000) (97,451,000)  
Allowance for Credit Losses 0 0  
Fair Value 1,024,510,000 1,060,331,000  
U.S. Treasury securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 50,015,000 50,030,000  
Unrealized Gains 51,000 320,000  
Unrealized Losses 0 0  
Allowance for Credit Losses 0 0  
Fair Value 50,066,000 50,350,000  
State and municipal bonds and obligations      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 186,398,000 191,428,000  
Unrealized Gains 32,000 55,000  
Unrealized Losses (8,015,000) (9,904,000)  
Allowance for Credit Losses 0 0  
Fair Value $ 178,415,000 $ 181,579,000