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Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 26, 2016 | Aug. 05, 2014
Total short-term borrowings | $ 30,413 | $ 401,561 | $ 401,561 |  |
Average daily balance short-term borrowings | 236,464 | 138,653 | 138,653 |  |
Maximum month-end balance short-term borrowings | 397,141 | 410,614 | 410,614 |  |
Total long-term borrowings | 217,296 | 216,905 |  |  |
Average daily balance long-term borrowings | 220,000 | 220,000 | 220,000 |  |
Maximum month-end balance long-term borrowings | 220,000 | 220,000 | 220,000 |  |
Subordinated Debt [Member] |  |  |  |  |
Total long-term borrowings | 220,000 | 220,000 | 220,000 |  |
Average daily balance long-term borrowings | 220,000 | 220,000 | 220,000 |  |
Maximum month-end balance long-term borrowings | $ 220,000 | $ 220,000 | $ 220,000 |  |
Debt instrument, interest rate, stated percentage | 5.42% | 5.42% | 5.42% | 5.00% | 5.75%
Average interest rate | 5.42% | 5.42% | 5.42% |  |
Month-end interest rate | 5.42% | 5.42% | 5.42% |  |
Customer Repos and Federal Funds Purchased [Member] |  |  |  |  |
Total short-term borrowings | $ 30,413 | $ 76,561 | $ 76,561 |  |
Average daily balance short-term borrowings | 44,333 | 73,237 | 73,237 |  |
Maximum month-end balance short-term borrowings | $ 72,141 | $ 85,614 | $ 85,614 |  |
Debt instrument, interest rate, stated percentage | 0.86% | 0.33% | 0.33% |  |
Average interest rate | 0.51% | 0.27% | 0.27% |  |
Month-end interest rate | 0.32% | 0.29% | 0.29% |  |
Federal Home Loan Bank [Member] |  |  |  |  |
Total short-term borrowings |  | $ 325,000 | $ 325,000 |  |
Average daily balance short-term borrowings | $ 192,131 | 65,416 | 65,416 |  |
Maximum month-end balance short-term borrowings | $ 325,000 | $ 325,000 | $ 325,000 |  |
Debt instrument, interest rate, stated percentage |  | 1.48% | 1.48% |  |
Average interest rate | 2.02% | 1.13% | 1.13% |  |
Month-end interest rate | 1.62% | 1.48% | 1.48% |  |

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