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Securities - Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Amortized Cost And Fair Value Debt Securities [Abstract]    
Total available-for-sale debt securities, Amortized Cost, Less than one year $ 61,932  
Total available-for-sale debt securities, Amortized Cost, 1-5 years 116,281  
Total available-for-sale debt securities, Amortized Cost, 5-10 years 407,897  
Total available-for-sale debt securities, Amortized Cost, Over 10 years 1,591,068  
Available-for-sale, Amortized Cost 2,177,178 $ 2,142,056
Total held-to-maturity debt securities, Amortized Cost, Less than one year 18,138  
Total held-to-maturity debt securities, Amortized Cost, 1-5 years 127,140  
Total held-to-maturity debt securities, Amortized Cost, 5-10 years 328,315  
Total held-to-maturity debt securities, Amortized Cost, Over 10 years 379,231  
Held-to-maturity, Amortized Cost 852,824 1,020,934
Total debt securities, Amortized Cost 3,030,002  
Total available-for-sale debt securities, Fair Value, Less than one year 61,992  
Total available-for-sale debt securities, Fair Value, 1-5 years 117,740  
Total available-for-sale debt securities, Fair Value, 5-10 years 416,454  
Total available-for-sale debt securities, Fair Value, Over 10 years 1,613,013  
Total available-for-sale debt securities, Fair Value 2,209,199 2,114,129
Total held-to-maturity debt securities, Fair Value, Less than one year 18,201  
Total held-to-maturity debt securities, Fair Value, 1-5 years 130,634  
Total held-to-maturity debt securities, Fair Value, 5-10 years 338,075  
Total held-to-maturity debt securities, Fair Value, Over 10 years 390,899  
Total held-to-maturity debt securities, Fair Value 877,809 1,020,743
Total debt securities, Fair Value $ 3,087,008 $ 3,134,872