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Securities - Maturity of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]  
Estimated Fair Value $ 12,328
Estimated Fair Value, Total 462,427
Amortized cost, Within one year 3,636
Amortized cost, After one year but within five years 7,364
Amortized cost, After five years but within ten years 945
Amortized cost, After ten years 268
Amortized cost, Total 12,213
Amortized Cost, Within one year 197,037
Amortized Cost, After one year but within five years 119,341
Amortized Cost, After five years but within ten years 31,322
Amortized Cost, After ten years 100,124
Total debt securities 447,824
Amortized Cost, Equity securities 8,652
Amortized Cost, Total 456,476
Held for Investment [Member]
  
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]  
Estimated Fair Value, Within one year 3,655
Estimated Fair Value, After one year but within five years 7,399
Estimated Fair Value, After five years but within ten years 976
Estimated Fair Value, After ten years 298
Estimated Fair Value 12,328
Available for Sale [Member]
  
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]  
Estimated Fair Value, Within one year 197,424
Estimated Fair Value, After one year but within five years 120,593
Estimated Fair Value, After five years but within ten years 32,035
Estimated Fair Value, After ten years 101,615
Total debt securities 451,667
Estimated Fair Value, Equity securities 10,760
Estimated Fair Value, Total $ 462,427