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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 459  
Due after one year through five years, Amortized Cost, Held-to-maturity 148,566  
Due after five years through ten years, Amortized Cost, Held-to-maturity 283,808  
Due after ten years, Amortized Cost, Held-to-maturity 365,451  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 798,284  
Due in one year or less, Fair Value, Held-to-maturity 450  
Due after one year through five years, Fair Value, Held-to-maturity 144,099  
Due after five years through ten years, Fair Value, Held-to-maturity 276,367  
Due after ten years, Fair Value, Held-to-maturity 355,214  
Total, Held-to-maturity, Fair Value 776,130  
Due in one year or less, Amortized Cost, Available-for-sale 24,088  
Due after one year through five years, Amortized Cost, Available-for-sale 1,718,590  
Due after five years through ten years, Amortized Cost, Available-for-sale 192,161  
Due after ten years, Amortized Cost, Available-for-sale 35,237  
Amortized Cost, Available-for-sale 1,970,076 $ 2,078,131
Due in one year or less, Fair Value, Available-for-sale 24,417  
Due after one year through five years, Fair Value, Available-for-sale 1,694,629  
Due after five years through ten years, Fair Value, Available-for-sale 188,031  
Due after ten years, Fair Value, Available-for-sale 34,515  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 1,941,592 $ 2,080,985