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FHLB Advances, Other Borrowings and Junior Subordinated Notes Payable (Composition of Borrowed Funds) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 318,934,000		$ 217,917,000
Borrowed funds, average balance	$ 251,940,000	$ 140,083,000
Borrowed funds, interest rate during period	2.68%	3.14%
Long-term borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 225,924,000		180,907,000
Short-term borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	93,010,000		37,010,000
Federal funds purchased
Composition of Borrowed Funds [Line Items]
Borrowed funds	0		0
Borrowed funds, average balance	$ 0	$ 66,000
Borrowed funds, interest rate during period	0.00%	1.22%
FHLB advances
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 284,500,000		183,500,000
Borrowed funds, average balance	$ 217,517,000	$ 105,276,000
Borrowed funds, interest rate during period	1.84%	1.40%
Line of credit
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 10,000		10,000
Borrowed funds, average balance	$ 10,000	$ 328,000
Borrowed funds, interest rate during period	4.32%	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	$ 23,727,000		23,713,000
Borrowed funds, average balance	$ 23,718,000	$ 23,161,000
Borrowed funds, interest rate during period	6.67%	6.93%
Junior subordinated notes
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 10,022,000		$ 10,019,000
Borrowed funds, average balance	$ 10,020,000	$ 10,011,000
Borrowed funds, interest rate during period	10.94%	11.11%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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-Name Accounting Standards Codification
-Topic 210
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