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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 500  
Due after one year through five years, Amortized Cost, Held-to-maturity 288,967  
Due after five years through ten years, Amortized Cost, Held-to-maturity 197,061  
Due after ten years, Amortized Cost, Held-to-maturity 257,912  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 744,440  
Due in one year or less, Fair Value, Held-to-maturity 508  
Due after one year through five years, Fair Value, Held-to-maturity 276,693  
Due after five years through ten years, Fair Value, Held-to-maturity 193,389  
Due after ten years, Fair Value, Held-to-maturity 250,947  
Total, Held-to-maturity, Fair Value 721,537  
Due in one year or less, Amortized Cost, Available-for-sale 13,907  
Due after one year through five years, Amortized Cost, Available-for-sale 1,574,638  
Due after five years through ten years, Amortized Cost, Available-for-sale 143,258  
Due after ten years, Amortized Cost, Available-for-sale 25,863  
Amortized Cost, Available-for-sale 1,757,666 $ 2,078,131
Due in one year or less, Fair Value, Available-for-sale 14,069  
Due after one year through five years, Fair Value, Available-for-sale 1,554,686  
Due after five years through ten years, Fair Value, Available-for-sale 140,500  
Due after ten years, Fair Value, Available-for-sale 24,830  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 1,734,085 $ 2,080,985