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Short-term Borrowings | 12 Months Ended
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Dec. 31, 2017
Short-term Debt [Abstract] |
Short-term Borrowings | Short-term Borrowings Short-term borrowings at December 31 were as follows:
| 2017 |  | 2016 |  | 2015
| Ending Balance |  | Average Balance |  | Average Rate |  | Ending Balance |  | Average Balance |  | Average Rate |  | Ending Balance |  | Average Balance |  | Average Rate
| (dollars in thousands)
Federal funds purchased | $ | — |  |  | $ | 6,225 |  |  | 1.24 | % |  | $ | — |  |  | $ | 6,887 |  |  | 0.60 | % |  | $ | 4,000 |  |  | $ | 14,832 |  |  | 0.36 | %
Borrowings from FHLB | 567,500 |  |  | 710,932 |  |  | 1.18 |  |  | 748,000 |  |  | 1,265,932 |  |  | 0.61 |  |  | 1,400,000 |  |  | 1,117,522 |  |  | 0.42 |
Securities sold under agreements to repurchase | 139,966 |  |  | 150,234 |  |  | 0.24 |  |  | 119,943 |  |  | 114,918 |  |  | 0.23 |  |  | 106,825 |  |  | 120,177 |  |  | 0.23 |
Total | $ | 707,466 |  |  | $ | 867,391 |  |  | 1.01 |  |  | $ | 867,943 |  |  | $ | 1,387,737 |  |  | 0.58 |  |  | $ | 1,510,825 |  |  | $ | 1,252,531 |  |  | 0.40 |
Maximum total at any month-end | $ | 967,259 |  |  |  |  |  |  | $ | 1,530,678 |  |  |  |  |  |  | $ | 1,510,825 |  |  |  |  |
Weighted average rate at year-end |  |  |  |  | 1.27 | % |  |  |  |  |  | 0.63 | % |  |  |  |  |  | 0.53 | %
Interest expense on short-term borrowings for the years ended December 31 is detailed below:
| 2017 |  | 2016 |  | 2015
| (dollars in thousands)
Federal funds purchased | $ | 77 |  |  | $ | 41 |  |  | $ | 54 |
Borrowings from FHLB | 8,360 |  |  | 7,765 |  |  | 4,684 |
Securities sold under agreements to repurchase | 362 |  |  | 270 |  |  | 280 |
Total interest on short-term borrowings | $ | 8,799 |  |  | $ | 8,076 |  |  | $ | 5,018 |

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- Definition The entire disclosure for short-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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