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Loans and Allowance for Loan Losses (Details Textual) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]
Criteria amount for evaluation of impairment	$ 500,000
Accruing substandard relationship	2,000,000
Specific reserves	8,120,000	9,500,000	12,200,000
Loans outstanding classified as troubled debt restructurings	613,000	689,000	891,000
FHLB
Loans and Allowance for Loan Losses (Textual) [Abstract]
Pledged as collateral to secure FHLB advances	$ 1,940,000,000	$ 1,900,000,000	$ 1,580,000,000

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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