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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Amortized Cost    
Due in one year $ 14,060  
Due after one year through five years 124,473  
Due after five years through ten years 376,294  
Due after ten years 1,959,774  
Amortized Cost 2,474,601 $ 2,208,330
Estimated Fair Value    
Due in one year 13,955  
Due after one year through five years 120,609  
Due after five years through ten years 370,606  
Due after ten years 1,857,737  
Totals 2,362,907 2,207,938
Amortized Cost    
Due in one year 0  
Due after one year through five years 1,693  
Due after five years through ten years 14,559  
Due after ten years 170,496  
Totals 186,748 199,759
Estimated Fair Value    
Due in one year 0  
Due after one year through five years 1,717  
Due after five years through ten years 14,431  
Due after ten years 167,822  
Totals $ 183,970 $ 208,140