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Deposits - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Type of Deposit [Line Items]
Brokered deposit placement fee	$ 10,264slm_Brokereddepositplacementfee	$ 9,754slm_Brokereddepositplacementfee	$ 8,416slm_Brokereddepositplacementfee
Placement fees paid to third parties	15,198slm_ThirdPartyBrokerFeesPaid	12,114slm_ThirdPartyBrokerFeesPaid	16,484slm_ThirdPartyBrokerFeesPaid
Deposits exceeding FDIC insurance limits	253,953us-gaap_TimeDeposits100000OrMore	159,637us-gaap_TimeDeposits100000OrMore
Accrued interest on deposits	16,082us-gaap_InterestPayableCurrent	13,097us-gaap_InterestPayableCurrent
Noninterest-bearing deposits	$ 602	$ 55,036

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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