Securities - Contractual Maturity of Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]
Less than one year, Amortized Cost	$ 51,990
Due after one year through five years, Amortized Cost	76,021
Due after five years through ten years, Amortized Cost	1,227
Due after ten years, Amortized Cost	55,000
Total Amortized Cost	184,238
Less than one year, Estimated Fair Value	52,106
Due after one year through five years, Estimated Fair Value	76,126
Due after five years through ten years, Estimated Fair Value	1,226
Due after ten years, Estimated Fair Value	47,090
Total Estimated Fair Value	$ 176,548