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Deposits - Additional Information (Details) (USD $)	3 Months Ended	12 Months Ended
Deposits - Additional Information (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Banking and Thrift [Abstract]
Certificates of deposit denominations	$ 100,000
Aggregate amount of certificates of deposit in denominations of $100,000 or more	$ 290,134,000	$ 253,464,000

- Definition

The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.

+ References+ Details