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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, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost, Held-to-maturity $ 885  
Due after one year through five years, Amortized Cost, Held-to-maturity 175,899  
Due after five years through ten years, Amortized Cost, Held-to-maturity 271,579  
Due after ten years, Amortized Cost, Held-to-maturity 381,527  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 829,890  
Due in one year or less, Fair Value, Held-to-maturity 882  
Due after one year through five years, Fair Value, Held-to-maturity 173,251  
Due after five years through ten years, Fair Value, Held-to-maturity 268,426  
Due after ten years, Fair Value, Held-to-maturity 376,656  
Total, Held-to-maturity, Fair Value 819,215  
Due in one year or less, Amortized Cost, Available-for-sale 17,864  
Due after one year through five years, Amortized Cost, Available-for-sale 1,929,815  
Due after five years through ten years, Amortized Cost, Available-for-sale 96,678  
Due after ten years, Amortized Cost, Available-for-sale 33,774  
Amortized Cost, Available-for-sale 2,078,131 $ 2,255,874
Due in one year or less, Fair Value, Available-for-sale 18,089  
Due after one year through five years, Fair Value, Available-for-sale 1,932,602  
Due after five years through ten years, Fair Value, Available-for-sale 96,200  
Due after ten years, Fair Value, Available-for-sale 34,094  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 2,080,985 $ 2,270,466