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FHLB Advances, Other Borrowings and Junior Subordinated Notes Payable (Composition of Borrowed Funds) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | $ 291,459 | $ 217,917
Borrowed funds, average balance | $ 312,460 | $ 140,083
Borrowed funds, interest rate during period | 2.67% | 3.14%
Long-term borrowings |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | $ 185,959 | $ 180,907
Short-term borrowings |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | 105,500 | 37,010
Federal funds purchased |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | 0 | 0
Borrowed funds, average balance | $ 159 | $ 66
Borrowed funds, interest rate during period | 2.43% | 1.22%
FHLB advances |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | $ 257,000 | $ 183,500
Borrowed funds, average balance | $ 277,866 | $ 105,276
Borrowed funds, interest rate during period | 2.01% | 1.40%
Line of credit |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | $ 0 | $ 10
Borrowed funds, average balance | $ 5 | $ 328
Borrowed funds, interest rate during period | 4.46% | 3.64%
Other borrowings |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | $ 675 | $ 675
Borrowed funds, average balance | $ 675 | $ 1,241
Borrowed funds, interest rate during period | 8.12% | 14.50%
Subordinated notes payable |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | $ 23,755 | $ 23,713
Borrowed funds, average balance | $ 23,732 | $ 23,161
Borrowed funds, interest rate during period | 6.65% | 6.93%
Junior subordinated notes |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | $ 10,029 | $ 10,019
Borrowed funds, average balance | $ 10,023 | $ 10,011
Borrowed funds, interest rate during period | 11.07% | 11.11%

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