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Investment Securities Amortized Cost and Estimated Fair Value of Restricted Equity Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Restricted Equity Securities [Line Items]
Amortized Cost	$ 13,912	$ 14,448	$ 14,823
Unrealized Gains	0	0	0
Unrealized Losses	0	0	0
Fair Value (Estimated)	13,912	14,448	14,823
Federal Home Loan Bank Stock [Member]
Restricted Equity Securities [Line Items]
Amortized Cost	12,876	13,412	13,412
Unrealized Gains	0	0	0
Unrealized Losses	0	0	0
Fair Value (Estimated)	12,876	13,412	13,412
Federal Reserve Bank Stock [Member]
Restricted Equity Securities [Line Items]
Amortized Cost	1,036	1,036	1,411
Unrealized Gains	0	0	0
Unrealized Losses	0	0	0
Fair Value (Estimated)	$ 1,036	$ 1,036	$ 1,411

X

- Definition

This item represents the cost of equity securities in Federal Home loan Banks and Federal Reserve Bank reported at cost and categorized as non-marketable with no determinable fair value because it ownership is restricted and it lacks a market.

+ References

No definition available.

+ Details

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- Details

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- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a security categorized as non marketable securities, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a security categorized as non marketable securities, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

+ References

No definition available.

+ Details

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- Definition

This item represents the aggregate fair value of non marketable securities as of the balance sheet date.

+ References

No definition available.

+ Details

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