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Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of short-term and long-term borrowings | Information relating to short-term and long-term borrowings is as follows for the years ended December 31:
|  | 2017 |  | 2016 |  | 2015 |
(dollars in thousands) |  | Amount |  | Rate |  | Amount |  | Rate |  | Amount |  | Rate |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
At Year-End: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer repurchase agreements and federal funds purchased |  | $ | 76,561 |  | 0.33 | % | $ | 68,876 |  | 0.35 | % | $ | 72,356 |  | 0.23 | %
Federal Home Loan Bank — current portion |  | 325,000 |  | 1.48 | % | — |  |  |  | — |  | — |
Total |  | $ | 401,561 |  |  |  | $ | 68,876 |  |  |  | $ | 72,356 |  |  |
Average Daily Balance: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer repurchase agreements and federal funds purchased |  | $ | 73,237 |  | 0.27 | % | $ | 77,833 |  | 0.21 | % | $ | 59,141 |  | 0.22 | %
Federal Home Loan Bank — current portion |  | 65,416 |  | 1.13 | % | 29,376 |  | 2.45 | % | 27,659 |  | 0.31 | %
Total |  | $ | 138,653 |  |  |  | $ | 107,209 |  |  |  | $ | 86,800 |  |  |
Maximum Month-end Balance: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer repurchase agreements and federal funds purchased |  | $ | 85,614 |  | 0.29 | % | $ | 136,689 |  | 0.16 | % | $ | 73,696 |  | 0.21 | %
Federal Home Loan Bank — current portion |  | 325,000 |  | 1.48 | % | 100,000 |  | 0.94 | % | 140,000 |  | 0.20 | %
Total |  | $ | 410,614 |  |  |  | $ | 236,689 |  |  |  | $ | 213,696 |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
At Year-End: |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank |  | $ | 0 |  | — |  | $ | 0 |  | — |  | $ | 0 |  | — |
Subordinated Notes |  | 220,000 |  | 5.42 | % | 220,000 |  | 5.42 | % | 70,000 |  | 5.75 | %
Total |  | $ | 220,000 |  |  |  | $ | 220,000 |  |  |  | $ | 70,000 |  |  |
Average Daily Balance: |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank |  | $ | 0 |  | — |  | $ | 0 |  | — |  | $ | 8,329 |  | 2.25 | %
Subordinated Notes |  | 220,000 |  | 5.54 | % | 135,164 |  | 5.54 | % | 74,117 |  | 6.06 | %
Total |  | $ | 220,000 |  |  |  | $ | 135,164 |  |  |  | $ | 82,446 |  |  |
Maximum Month-end Balance: |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank |  | $ | 0 |  | — |  | $ | 0 |  | — |  | $ | 40,000 |  | 0.37 | %
Subordinated Notes |  | 220,000 |  | 5.42 | % | 220,000 |  | 5.42 | % | 79,300 |  | 6.52 | %
Total |  | $ | 220,000 |  |  |  | $ | 220,000 |  |  |  | $ | 119,300 |  |  |

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