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Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 26, 2016 | Aug. 05, 2014
Total short-term borrowings | $ 401,561 | $ 68,876 | $ 72,356 |  |
Average daily balance short-term borrowings | 138,653 | 107,209 | 86,800 |  |
Maximum month-end balance short-term borrowings | 410,614 | 236,689 | 213,696 |  |
Total long-term borrowings | 216,905 | 216,514 | 70,000 |  |
Average daily balance long-term borrowings | 220,000 | 135,164 | 82,446 |  |
Maximum month-end balance long-term borrowings | 220,000 | 220,000 | 119,300 |  |
Subordinated Debt [Member] |  |  |  |  |
Total long-term borrowings | 220,000 | 220,000 | 70,000 |  |
Average daily balance long-term borrowings | 220,000 | 135,164 | 74,117 |  |
Maximum month-end balance long-term borrowings | $ 220,000 | $ 220,000 | $ 79,300 |  |
Debt instrument, interest rate, stated percentage | 5.42% | 5.42% | 5.75% | 5.00% | 5.75%
Average interest rate | 5.42% | 5.42% | 6.06% |  |
Month-end interest rate | 5.42% | 5.42% | 6.52% |  |
Federal Home Loan Bank LTD [Member] |  |  |  |  |
Total long-term borrowings | $ 0 | $ 0 | $ 0 |  |
Average daily balance long-term borrowings | 0 | 0 | 8,329 |  |
Maximum month-end balance long-term borrowings | 0 | 0 | $ 40,000 |  |
Average interest rate |  |  | 2.25% |  |
Month-end interest rate |  |  | 0.37% |  |
Customer Repos and Federal Funds Purchased [Member] |  |  |  |  |
Total short-term borrowings | 76,561 | 68,876 | $ 72,356 |  |
Average daily balance short-term borrowings | 73,237 | 77,833 | 59,141 |  |
Maximum month-end balance short-term borrowings | $ 85,614 | $ 136,689 | $ 73,696 |  |
Debt instrument, interest rate, stated percentage | 0.33% | 0.35% | 0.23% |  |
Average interest rate | 0.27% | 0.21% | 0.22% |  |
Month-end interest rate | 0.29% | 0.16% | 0.21% |  |
Federal Home Loan Bank [Member] |  |  |  |  |
Total short-term borrowings | $ 325,000 |  |  |  |
Average daily balance short-term borrowings | 65,416 | $ 29,376 | $ 27,659 |  |
Maximum month-end balance short-term borrowings | $ 325,000 | $ 100,000 | $ 140,000 |  |
Debt instrument, interest rate, stated percentage | 1.48% |  |  |  |
Average interest rate | 1.13% | 2.45% | 0.31% |  |
Month-end interest rate | 1.48% | 0.94% | 0.20% |  |

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