v3.26.1
Investments - Fair Value and Amortized Cost of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]    
Available-for-Sale, Amortized Cost, Within one year $ 58,190  
Available-for-Sale, Amortized Cost, One to five years 32,790  
Available-for-Sale, Amortized Cost, Five to ten years 82,171  
Available-for-Sale, Amortized Cost, After ten years 8,270  
Available-for-Sale, Amortized Cost, Small Business Administration loan pools 77,400  
Available-for-Sale, Amortized Cost, Mortgage-backed securities 866,334  
Available-for-Sale, Amortized Cost 1,125,155 $ 1,022,470
Available-for-Sale, Fair Value, Within one year 58,262  
Available-for-Sale, Fair Value, One to five years 33,020  
Available-for-Sale, Fair Value, Five to ten years 81,251  
Available-for-Sale, Fair Value, After ten years 8,023  
Available-for-Sale, Fair Value, Small Business Administration loan pools 77,335  
Available-for-Sale, Fair Value, Mortgage-backed securities 867,271  
Available-for-Sale, Fair Value, Total debt securities 1,125,162 1,030,568
Held-to-Maturity, Amortized Cost, Five to ten years 170  
Held-to-Maturity, Amortized Cost, After ten years 1,110  
Held-to-Maturity, Amortized Cost, Mortgage-backed securities 3,974  
Held-to-Maturity, Amortized Cost 5,254 5,248
Held-to-Maturity, Fair Value, Five to ten years 167  
Held-to-Maturity, Fair Value, After ten years 1,126  
Held-to-Maturity, Fair Value, Mortgage-backed securities 4,053  
Held-to-Maturity, Fair Value, Total debt securities $ 5,346 $ 5,409