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Short and Long-Term Funding (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Breakdown of short & long-term debt balances | he components of short-term funding (funding with original contractual maturities of one year or less), long-term funding (funding with original contractual maturities greater than one year), and FHLB advances (funding based on original contractual maturities).
| June 30, 2018 |  | December 31, 2017
| ($ in Thousands)
Short-Term Funding |  |  |
Federal funds purchased | $ | 20,720 |  |  | $ | 141,950 |
Securities sold under agreements to repurchase | 183,013 |  |  | 182,865 |
Federal funds purchased and securities sold under agreements to repurchase | 203,733 |  |  | 324,815 |
Commercial paper | 52,791 |  |  | 67,467 |
Total short-term funding | $ | 256,525 |  |  | $ | 392,282 |
Long-Term Funding |  |  |
Senior notes, at par | $ | 250,000 |  |  | $ | 250,000 |
Subordinated notes, at par | 250,000 |  |  | 250,000 |
Other long-term funding and capitalized costs | (2,381 | ) |  | (2,718 | )
Total long-term funding | 497,619 |  |  | 497,282 |
Total short and long-term funding, excluding FHLB advances | $ | 754,144 |  |  | $ | 889,564 |
FHLB Advances |  |  |
Short-term FHLB advances | $ | 370,000 |  |  | $ | 284,000 |
Long-term FHLB advances | 4,427,857 |  |  | 2,900,168 |
Total FHLB advances | $ | 4,797,857 |  |  | $ | 3,184,168 |
Total short and long-term funding | $ | 5,552,001 |  |  | $ | 4,073,732 |
Remaining contractual maturity of securities sold under agreements to repurchase | The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of June 30, 2018 and December 31, 2017 are presented in the following table.
| Remaining Contractual Maturity of the Agreements
| Overnight and Continuous |  | Up to 30 days |  | 30-90 days |  | Greater than 90 days |  | Total
June 30, 2018 |  |  |  |  | ($ in Thousands) |  |  |  |
Repurchase agreements |  |  |  |  |  |  |  |  |
Agency mortgage-related securities | $ | 183,013 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 183,013 |
Total | $ | 183,013 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 183,013 |
December 31, 2017 |  |  |  |  |  |  |  |  |
Repurchase agreements |  |  |  |  |  |  |  |  |
Agency mortgage-related securities | $ | 182,865 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 182,865 |
Total | $ | 182,865 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 182,865 |
FHLB_Maturity_ [Table Text Block] | The original contractual maturity or next put date of the Corporation's FHLB advances as of June 30, 2018 and December 31, 2017 are presented in the following table.
| June 30, 2018 |  | December 31, 2017
| Amount |  | Weighted Average Contractual Coupon Rate |  | Amount |  | Weighted Average Contractual Coupon Rate
| ($ in Thousands)
Maturity or put date within 1 year | $ | 2,632,613 |  |  | 1.70 | % |  | $ | 2,434,000 |  |  | 1.26 | %
After 1 but within 2 | 1,861,040 |  |  | 2.25 | % |  | 750,013 |  |  | 1.23 | %
After 2 but within 3 | 291,606 |  |  | 2.60 | % |  | 155 |  |  | 4.91 | %
After 3 years | 12,598 |  |  | 4.55 | % |  | — |  |  | — | %
FHLB advances and overall rate | $ | 4,797,857 |  |  | 1.97 | % |  | $ | 3,184,168 |  |  | 1.26 | %

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the nature and risks of short-term collateralized financing obtained through repurchase agreements, securities lending transactions and repurchase-to-maturity transactions, accounted for as secured borrowings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 + Details
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