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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 130,897
Due after one year through five years, Amortized Cost 2,116,400
Due after five years through ten years, Amortized Cost 796,615
Due after ten years, Amortized Cost 84,957
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 3,128,869
Due in one year or less, Fair Value 133,756
Due after one year through five years, Fair Value 2,156,397
Due after five years through ten years, Fair Value 782,833
Due after ten years, Fair Value 87,070
Total, Available-for-sale, Fair Value $ 3,160,056
Due in one year or less, Weighted-Average Yield 3.51%
Due after one year through five years, Weighted-Average Yield 2.48%
Due after five years through ten years, Weighted-Average Yield 2.20%
Due after ten years, Weighted-Average Yield 2.72%
Total, Available-for-sale, Weighted-Average Yield 2.46%