Investment Securities - Summary of held to maturity securities in an unrealized loss position (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Summary of held to maturity securities in an unrealized loss position
Fair Value, Less than 12 Months	$ 4,929
Unrealized Loss, Less than 12 Months	51
Fair Value, 12 Months or More
Unrealized Loss, 12 Months or More
Fair Value, Total	4,929
Unrealized Loss, Total	51
Mortgage-backed securities
Summary of held to maturity securities in an unrealized loss position
Fair Value, Less than 12 Months	4,929
Unrealized Loss, Less than 12 Months	51
Fair Value, 12 Months or More
Unrealized Loss, 12 Months or More
Fair Value, Total	4,929
Unrealized Loss, Total	$ 51

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for those securities which are categorized as held-to-maturity.

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This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

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- Definition

This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position.

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- Definition

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized as held-to-maturity.

+ References+ Details

- Definition

This item represents the fair value of securities categorized as held-to-maturity that have been in a continuous unrealized loss position for less than twelve months.

+ References+ Details

- Definition

This item represents the fair value of securities categorized as held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References+ Details