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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
Investments, Debt and Equity Securities [Abstract]  
Due in one year or less, Amortized Cost, Held-to-maturity $ 124,536
Due after one year through five years, Amortized Cost, Held-to-maturity 139,716
Due after five years through ten years, Amortized Cost, Held-to-maturity 554,537
Due after ten years, Amortized Cost, Held-to-maturity 50,861
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis 869,650
Due in one year or less, Fair Value, Held-to-maturity 125,460
Due after one year through five years, Fair Value, Held-to-maturity 141,134
Due after five years through ten years, Fair Value, Held-to-maturity 558,832
Due after ten years, Fair Value, Held-to-maturity 50,957
Total, Held-to-maturity, Fair Value 876,383
Due in one year or less, Amortized Cost, Available-for-sale 91,512
Due after one year through five years, Amortized Cost, Available-for-sale 1,894,584
Due after five years through ten years, Amortized Cost, Available-for-sale 118,633
Due after ten years, Amortized Cost, Available-for-sale 154,776
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Available-for-sale 2,259,505
Due in one year or less, Amortized Cost, Available-for-sale 92,781
Due after one year through five years, Amortized Cost, Available-for-sale 1,939,712
Due after five years through ten years, Amortized Cost, Available-for-sale 121,282
Due after ten years, Amortized Cost, Available-for-sale 158,946
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Available-for-sale $ 2,312,721