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Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 113,183
Due after one year through five years, Amortized Cost 1,718,930
Due after five years through ten years, Amortized Cost 865,160
Due after ten years, Amortized Cost 44,094
Total Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 2,741,367
Due in one year or less, Fair Value 116,202
Due after one year through five years, Fair Value 1,750,370
Due after five years through ten years, Fair Value 840,172
Due after ten years, Fair Value 43,319
Total, Available-for-sale, Fair Value $ 2,750,063
Due in one year or less, Weighted-Average Yield 3.25%
Due after one year through five years, Weighted-Average Yield 2.56%
Due after five years through ten years, Weighted-Average Yield 2.14%
Due after ten years, Weighted-Average Yield 3.57%
Total, Available-for-sale, Weighted-Average Yield 2.47%