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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
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 327,802  
Due after five years through ten years, Amortized Cost, Held-to-maturity 161,463  
Due after ten years, Amortized Cost, Held-to-maturity 214,188  
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 703,953  
Due in one year or less, Fair Value, Held-to-maturity 500  
Due after one year through five years, Fair Value, Held-to-maturity 328,561  
Due after five years through ten years, Fair Value, Held-to-maturity 163,676  
Due after ten years, Fair Value, Held-to-maturity 219,154  
Total, Held-to-maturity, Fair Value 711,891  
Due in one year or less, Amortized Cost, Available-for-sale 12,278  
Due after one year through five years, Amortized Cost, Available-for-sale 1,345,036  
Due after five years through ten years, Amortized Cost, Available-for-sale 171,657  
Due after ten years, Amortized Cost, Available-for-sale 20,435  
Amortized Cost, Available-for-sale 1,549,406 $ 1,757,666
Due in one year or less, Fair Value, Available-for-sale 12,426  
Due after one year through five years, Fair Value, Available-for-sale 1,364,026  
Due after five years through ten years, Fair Value, Available-for-sale 173,033  
Due after ten years, Fair Value, Available-for-sale 20,921  
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value $ 1,570,406 $ 1,734,085