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Deposits - Additional Information (Details) (USD $)	3 Months Ended
Deposits - Additional Information (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Banking and Thrift [Abstract]
Brokered deposit placement fee	$ 2,695,000slm_Brokereddepositplacementfee	$ 2,750,000slm_Brokereddepositplacementfee
Third Party Broker Fees Paid	0slm_ThirdPartyBrokerFeesPaid	0slm_ThirdPartyBrokerFeesPaid
Deposits exceeding FDIC insurance limits	224,182,000us-gaap_TimeDeposits100000OrMore		253,953,000us-gaap_TimeDeposits100000OrMore
Accrued interest on deposits	$ 22,624,000us-gaap_InterestPayableCurrent		$ 16,082,000us-gaap_InterestPayableCurrent

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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