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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortized Cost    
Due in one year $ 990  
Due after one year through five years 182,664  
Due after five years through ten years 262,409  
Due after ten years 1,229,196  
Amortized Cost 1,675,259 $ 1,395,081
Estimated Fair Value    
Due in one year 1,018  
Due after one year through five years 182,915  
Due after five years through ten years 262,888  
Due after ten years 1,235,284  
Totals 1,682,105 1,414,264
Amortized Cost    
Due in one year 0  
Due after one year through five years 1,003  
Due after five years through ten years 21,248  
Due after ten years 238,203  
Totals 260,454 284,563
Estimated Fair Value    
Due in one year 0  
Due after one year through five years 1,118  
Due after five years through ten years 21,967  
Due after ten years 248,354  
Totals $ 271,439 $ 298,726