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Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Tables) | 12 Months Ended
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Dec. 31, 2017
INVESTMENTS IN QUALIFIED AFFORDABLE HOUSING PARTNERSHIPS, TAX CREDIT AND OTHER INVESTMENTS, NET |
Schedule of investments in qualified affordable housing partnerships and related unfunded commitments | The following table presents the balances of the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of the periods indicated:
($ in thousands) |  | December 31,
| 2017 |  | 2016
Investments in qualified affordable housing partnerships, net |  | $ | 162,824 |  |  | $ | 183,917 |
Accrued expenses and other liabilities — Unfunded commitments |  | $ | 55,815 |  |  | $ | 57,243 |
Schedule of other information related to investments in qualified affordable housing partnership | The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the periods indicated:
($ in thousands) |  | Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Tax credits and other tax benefits recognized |  | $ | 46,698 |  |  | $ | 37,252 |  |  | $ | 38,271 |
Amortization expense included in income tax expense |  | $ | 38,464 |  |  | $ | 28,206 |  |  | $ | 26,814 |
Schedule of unfunded commitments related to investments in qualified affordable housing partnerships, tax credit and other investments, net estimated to be paid | As of December 31, 2017, the Company’s unfunded commitments related to investments in qualified affordable housing partnerships, tax credit and other investments are estimated to be funded as follows:
($ in thousands) |  | Amount
2018 |  | $ | 98,000 |
2019 |  | 34,790 |
2020 |  | 16,744 |
2021 |  | 7,734 |
2022 |  | 11,078 |
Thereafter |  | 841 |
Total |  | $ | 169,187 |
The following table presents the Company’s credit-related commitments as of the periods indicated:
($ in thousands) |  | December 31,
| 2017 |  | 2016
Loan commitments |  | $ | 5,075,480 |  |  | $ | 5,077,869 |
Commercial letters of credit and SBLCs |  | $ | 1,655,897 |  |  | $ | 1,525,613 |

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