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Short-term Borrowings | 12 Months Ended
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Dec. 31, 2018
Short-term Debt [Abstract] |
Short-term Borrowings | Short-term Borrowings Short-term borrowings at December 31 were as follows:
| 2018 |  | 2017 |  | 2016
| Ending Balance |  | Average Balance |  | Average Rate |  | Ending Balance |  | Average Balance |  | Average Rate |  | Ending Balance |  | Average Balance |  | Average Rate
| (dollars in thousands)
Federal funds purchased | $ | 11,000 |  |  | $ | 8,801 |  |  | 2.05 | % |  | $ | — |  |  | $ | 6,225 |  |  | 1.24 | % |  | $ | — |  |  | $ | 6,887 |  |  | 0.60 | %
Borrowings from FHLB | 565,000 |  |  | 467,594 |  |  | 2.12 |  |  | 567,500 |  |  | 710,932 |  |  | 1.18 |  |  | 748,000 |  |  | 1,265,932 |  |  | 0.61 |
Securities sold under agreements to repurchase | 145,823 |  |  | 142,562 |  |  | 0.44 |  |  | 139,966 |  |  | 150,234 |  |  | 0.24 |  |  | 119,943 |  |  | 114,918 |  |  | 0.23 |
Total | $ | 721,823 |  |  | $ | 618,957 |  |  | 1.74 |  |  | $ | 707,466 |  |  | $ | 867,391 |  |  | 1.01 |  |  | $ | 867,943 |  |  | $ | 1,387,737 |  |  | 0.58 |
Maximum total at any month-end | $ | 811,026 |  |  |  |  |  |  | $ | 967,259 |  |  |  |  |  |  | $ | 1,530,678 |  |  |  |  |
Weighted average rate at year-end |  |  |  |  | 2.17 | % |  |  |  |  |  | 1.27 | % |  |  |  |  |  | 0.63 | %
Interest expense on short-term borrowings for the years ended December 31 is detailed below:
| 2018 |  | 2017 |  | 2016
| (dollars in thousands)
Federal funds purchased | $ | 180 |  |  | $ | 77 |  |  | $ | 41 |
Borrowings from FHLB | 9,929 |  |  | 8,360 |  |  | 7,765 |
Securities sold under agreements to repurchase | 632 |  |  | 362 |  |  | 270 |
Total interest on short-term borrowings | $ | 10,741 |  |  | $ | 8,799 |  |  | $ | 8,076 |

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