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Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Available-for-sale, amortized cost 
Due in one year or less$ 1,881
Due after one year through five years65,648
Due after five years through ten years67,483
Due after ten years1,060
U.S. Government agency mortgage-backed179,589
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total315,661
Available-for-sale, fair value 
Due in one year or less1,894
Due after one year through five years66,294
Due after five years through ten years67,967
Due after ten years1,060
U.S. Government agency mortgage-backed184,107
Available-for-sale Securities, Debt Securities, Total321,322
Held-to-maturity, amortized cost 
Due in one year or less3,419
Due after one year through five years27,251
Due after five years through ten years18,287
Due after ten years5,925
U.S. Government agency mortgage-backed0
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount, Total54,882
Held-to-maturity, fair value 
Due in one year or less3,440
Due after one year through five years28,215
Due after five years through ten years19,167
Due after ten years5,925
U.S. Government agency mortgage-backed0
Held-to-maturity Securities, Debt Maturities, Fair Value, Total$ 56,747