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FHLB Advances, Other Borrowings and Junior Subordinated Notes Payable (Composition of Borrowed Funds) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Composition of Borrowed Funds [Line Items] |  |  |
Borrowed funds | $ 375,442,000 |  | $ 217,917,000
Borrowed funds, average balance | $ 305,114,000 | $ 140,083,000 |
Borrowed funds, interest rate during period | 2.63% | 3.14% |
Long-term borrowings |  |  |
Composition of Borrowed Funds [Line Items] |  |  |
Borrowed funds | $ 210,942,000 |  | 180,907,000
Short-term borrowings |  |  |
Composition of Borrowed Funds [Line Items] |  |  |
Borrowed funds | 164,500,000 |  | 37,010,000
Federal funds purchased |  |  |
Composition of Borrowed Funds [Line Items] |  |  |
Borrowed funds | 0 |  | 0
Borrowed funds, average balance | $ 240,000 | $ 66,000 |
Borrowed funds, interest rate during period | 2.41% | 1.22% |
FHLB advances |  |  |
Composition of Borrowed Funds [Line Items] |  |  |
Borrowed funds | $ 341,000,000 |  | 183,500,000
Borrowed funds, average balance | $ 270,445,000 | $ 105,276,000 |
Borrowed funds, interest rate during period | 1.95% | 1.40% |
Line of credit |  |  |
Composition of Borrowed Funds [Line Items] |  |  |
Borrowed funds | $ 0 |  | 10,000
Borrowed funds, average balance | $ 7,000 | $ 328,000 |
Borrowed funds, interest rate during period | 4.43% | 3.64% |
Other borrowings |  |  |
Composition of Borrowed Funds [Line Items] |  |  |
Borrowed funds | $ 675,000 |  | 675,000
Borrowed funds, average balance | $ 675,000 | $ 1,241,000 |
Borrowed funds, interest rate during period | 8.09% | 14.50% |
Subordinated notes payable |  |  |
Composition of Borrowed Funds [Line Items] |  |  |
Borrowed funds | $ 23,741,000 |  | 23,713,000
Borrowed funds, average balance | $ 23,725,000 | $ 23,161,000 |
Borrowed funds, interest rate during period | 6.66% | 6.93% |
Junior subordinated notes |  |  |
Composition of Borrowed Funds [Line Items] |  |  |
Borrowed funds | $ 10,026,000 |  | $ 10,019,000
Borrowed funds, average balance | $ 10,022,000 | $ 10,011,000 |
Borrowed funds, interest rate during period | 11.01% | 11.11% |

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