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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 12,503  
Due after one year through five years, Amortized Cost, Held-to-maturity 35,475  
Due after five years through ten years, Amortized Cost, Held-to-maturity 304,156  
Due after ten years, Amortized Cost, Held-to-maturity 2,160,573  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 2,512,707  
Due in one year or less, Fair Value, Held-to-maturity 11,943  
Due after one year through five years, Fair Value, Held-to-maturity 34,143  
Due after five years through ten years, Fair Value, Held-to-maturity 270,028  
Due after ten years, Fair Value, Held-to-maturity 1,792,539  
Total, Held-to-maturity, Fair Value 2,108,653  
Due in one year or less, Amortized Cost, Available-for-sale 1,672  
Due after one year through five years, Amortized Cost, Available-for-sale 326,240  
Due after five years through ten years, Amortized Cost, Available-for-sale 2,195,487  
Due after ten years, Amortized Cost, Available-for-sale 1,053,538  
Amortized Cost, Available-for-sale 3,576,937 $ 3,755,297
Due in one year or less, Fair Value, Available-for-sale 1,671  
Due after one year through five years, Fair Value, Available-for-sale 298,804  
Due after five years through ten years, Fair Value, Available-for-sale 1,881,242  
Due after ten years, Fair Value, Available-for-sale 886,434  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 3,068,151 $ 3,255,211