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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Investments Debt And Equity Securities [Abstract]  
Within one year $ 19,565
After one but within five years 105,407
After five but within ten years 25,561
After ten years 76,078
Available for sale securities 226,611
Mortgage-backed securities 74,522
Total $ 301,133