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Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Available for sale    
Amortized cost within one year $ 31,763 $ 0
Amortized cost one to five years 49,247 0
Amortized cost for five to ten years 76,478 173,533
Amortized cost for after ten years 277,388 90,505
Amortized cost, available for sale 434,876 264,038
Amortized Cost 926,083 282,022
Fair value within one year 31,797 0
Fair value for one to five years 48,529 0
Fair value for five to ten years 68,141 141,915
Fair value for after ten years 240,873 77,219
Fair value, available for sale 389,340 219,134
Total available for sale investment securities, amortized cost, fair value 883,242 233,677
Held to maturity    
Within one year, amortized cost 0 59,129
One to five years, amortized cost 0 298,362
Five to ten years, amortized cost 0 366,493
After ten years, amortized cost 0 764,860
Amortized cost, held to maturity 0 1,488,844
Amortized Cost 0 1,867,848
Within one year, fair value 0 58,304
One to five years, fair value 0 278,007
five to ten years, fair value 0 312,748
After ten years, fair value 0 597,067
Fair value, held to maturity 0 1,246,126
Fair value, held to maturity 0 1,566,268
U.S. government agency mortgage-backed securities    
Available for sale    
Amortized cost, available for sale, mortgage obligations 491,207 17,984
Amortized Cost 491,207 17,984
Fair value, available for sale, without single maturity 493,902 14,543
Total available for sale investment securities, amortized cost, fair value 493,902 14,543
Held to maturity    
Without a single maturity date, amortized cost 0 349,726
Amortized Cost 0 349,726
Without a single maturity date, fair value 0 294,822
Fair value, held to maturity 0 294,822
Private labeled mortgage-backed pools    
Held to maturity    
Without a single maturity date, amortized cost 0 29,278
Amortized Cost 0 29,278
Without a single maturity date, fair value 0 25,320
Fair value, held to maturity $ 0 $ 25,320