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FHLB Advances, Other Borrowings and Junior Subordinated Notes Payable (Composition of Borrowed Funds) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 279,995	$ 308,977
Borrowed funds, average balance	$ 302,472	$ 308,943
Borrowed funds, interest rate during period	2.82%	2.72%
Long-term borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 160,995	$ 172,477
Short-term borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	119,000	136,500
Federal funds purchased
Composition of Borrowed Funds [Line Items]
Borrowed funds	0	0
Borrowed funds, average balance	$ 0	$ 119
Borrowed funds, interest rate during period	0.00%	2.43%
FHLB advances
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 245,500	$ 274,500
Borrowed funds, average balance	$ 267,989	$ 274,382
Borrowed funds, interest rate during period	2.16%	2.06%
Line of credit
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 0	$ 0
Borrowed funds, average balance	$ 0	$ 3
Borrowed funds, interest rate during period	0.00%	4.47%
Other borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 675	$ 675
Borrowed funds, average balance	$ 675	$ 675
Borrowed funds, interest rate during period	8.00%	7.94%
Subordinated notes payable
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 23,783	$ 23,769
Borrowed funds, average balance	$ 23,774	$ 23,739
Borrowed funds, interest rate during period	6.63%	6.64%
Junior subordinated notes
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 10,037	$ 10,033
Borrowed funds, average balance	$ 10,034	$ 10,025
Borrowed funds, interest rate during period	10.92%	11.10%

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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