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Short-term borrowings (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of Short-term Debt | The detail of short-term borrowings for the years 2017, 2016 and 2015 is presented in the following table:
(Dollars in thousands) |  | Federal Funds Purchased |  | Securities Sold Under Agreements to Repurchase |  | Trading Liabilities |  | Other Short-term Borrowings
2017 |  |  |  |  |  |  |  |
Average balance |  | $ | 447,137 |  |  | $ | 578,666 |  |  | $ | 685,891 |  |  | $ | 554,502 |
Year-end balance |  | 399,820 |  |  | 656,602 |  |  | 638,515 |  |  | 2,626,213 |
Maximum month-end outstanding |  | 568,490 |  |  | 743,684 |  |  | 896,943 |  |  | 2,626,213 |
Average rate for the year |  | 1.06 | % |  | 0.72 | % |  | 2.26 | % |  | 1.28 | %
Average rate at year-end |  | 1.48 |  |  | 0.64 |  |  | 2.22 |  |  | 1.44 |
2016 |  |  |  |  |  |  |  |
Average balance |  | $ | 589,223 |  |  | $ | 425,452 |  |  | $ | 771,039 |  |  | $ | 198,440 |
Year-end balance |  | 414,207 |  |  | 453,053 |  |  | 561,848 |  |  | 83,177 |
Maximum month-end outstanding |  | 695,083 |  |  | 528,024 |  |  | 874,076 |  |  | 792,736 |
Average rate for the year |  | 0.52 | % |  | 0.08 | % |  | 1.95 | % |  | 0.67 | %
Average rate at year-end |  | 0.73 |  |  | 0.08 |  |  | 2.46 |  |  | 0.96 |
2015 |  |  |  |  |  |  |  |
Average balance |  | $ | 705,054 |  |  | $ | 370,097 |  |  | $ | 733,189 |  |  | $ | 164,951 |
Year-end balance |  | 464,166 |  |  | 338,133 |  |  | 566,019 |  |  | 137,861 |
Maximum month-end outstanding |  | 1,228,125 |  |  | 524,191 |  |  | 866,005 |  |  | 339,468 |
Average rate for the year |  | 0.26 | % |  | 0.06 | % |  | 2.18 | % |  | 0.67 | %
Average rate at year-end |  | 0.50 |  |  | 0.09 |  |  | 2.41 |  |  | 0.82 |

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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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