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Short and Long-Term Funding FHLB Maturity Schedule (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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FHLB_Maturity_ [Line Items] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | $ 4,797,857 | $ 3,184,168
FHLB Weighted Average Coupon Rate | 1.97% | 1.26%
FHLB Maturity within One Year [Domain] |  |
FHLB_Maturity_ [Line Items] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | $ 2,632,613 | $ 2,434,000
FHLB Weighted Average Coupon Rate | 1.70% | 1.26%
FHLB Maturity One Year to Two Years [Domain] |  |
FHLB_Maturity_ [Line Items] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | $ 1,861,040 | $ 750,013
FHLB Weighted Average Coupon Rate | 2.25% | 1.23%
FHLB Maturity Over Two Years to Three Years [Domain] |  |
FHLB_Maturity_ [Line Items] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | $ 291,606 | $ 155
FHLB Weighted Average Coupon Rate | 2.60% | 4.91%
FHLB Maturity Over Three Years [Domain] |  |
FHLB_Maturity_ [Line Items] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | $ 12,598 | $ 0
FHLB Weighted Average Coupon Rate | 4.55% | 0.00%

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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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