Investment Securities - Schedule of Amortized Cost and Estimated Fair Value by Maturity of Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Investments Debt And Equity Securities [Abstract]
Securities Available for Sale, Weighted Average Yield, Within one year or less	0.12%
Securities Available for Sale, Weighted Average Yield, One through five years	1.34%
Securities Available for Sale, Weighted Average Yield, After five through ten years	1.90%
Securities Available for Sale, Weighted Average Yield, Over ten years	1.75%
Securities Available for Sale, Weighted Average Yield, Totals	1.68%
Securities Available for Sale, Amortized Cost, Within one year or less	$ 78,131
Securities Available for Sale, Amortized Cost, One through five years	231,579
Securities Available for Sale, Amortized Cost, After five through ten years	593,060
Securities Available for Sale, Amortized Cost, Over ten years	1,014,975
Securities Available for Sale, Amortized Cost, Totals	1,917,745
Securities Available for Sale, Fair Value, Within one year or less	78,219
Securities Available for Sale, Fair Value, One through five years	234,222
Securities Available for Sale, Fair Value, After five through ten years	606,763
Securities Available for Sale, Fair Value, Over ten years	1,032,344
Securities Available for Sale, Fair Value, Totals	1,951,548
Securities Held to Maturity, Weighted Average Yield, Within one year or less	1.77%
Securities Held to Maturity, Weighted Average Yield, One through five years	2.00%
Securities Held to Maturity, Weighted Average Yield, After five through ten years	2.53%
Securities Held to Maturity, Weighted Average Yield, Over ten years	2.91%
Securities Held to Maturity, Weighted Average Yield, Totals	2.48%
Securities Held to Maturity, Amortized Cost, Within one year or less	21,425
Securities Held to Maturity, Amortized Cost, One through five years	56,171
Securities Held to Maturity, Amortized Cost, After five through ten years	23,073
Securities Held to Maturity, Amortized Cost, Over ten years	97,773
Securities Held to Maturity, Amortized Cost, Totals	198,442
Securities Held to Maturity, Fair Value, Within one year or less	21,507
Securities Held to Maturity, Fair Value, One through five years	57,395
Securities Held to Maturity, Fair Value, After five through ten years	24,182
Securities Held to Maturity, Fair Value, Over ten years	100,016
Securities Held to Maturity, Fair Value, Totals	$ 203,100

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