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Short-term borrowings (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Short-term Debt | The detail of short-term borrowings for the years 2018, 2017 and 2016 is presented in the following table:
(Dollars in thousands) |  | Federal Funds Purchased |  | Securities Sold Under Agreements to Repurchase |  | Trading Liabilities |  | Other Short-term Borrowings
2018 |  |  |  |  |  |  |  |
Average balance |  | $ | 405,110 |  |  | $ | 713,841 |  |  | $ | 682,943 |  |  | $ | 1,046,585 |
Year-end balance |  | 256,567 |  |  | 762,592 |  |  | 335,380 |  |  | 114,764 |
Maximum month-end outstanding |  | 503,138 |  |  | 891,425 |  |  | 890,717 |  |  | 2,229,155 |
Average rate for the year |  | 1.89 | % |  | 1.40 | % |  | 2.83 | % |  | 1.82 | %
Average rate at year-end |  | 2.50 |  |  | 1.66 |  |  | 3.21 |  |  | 2.48 |
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 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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