Loans (Troubled Debt Restructurings) (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Financing Receivable, Impaired [Line Items]
Guarantee percentage of SBA Loan	90.00%
Average recorded investment	$ 1,460	$ 4,410
Impaired financing receivable, related allowance	$ 332	280
Nonaccrual loans, TDRs		$ 153
Number of loans modified as a TDR \| loan	0	0
Financing receivable, accrual status	$ 1,162,366	$ 960,135
Financing receivable, nonaccrual status	2,994	7,237
Troubled Debt Restructuring
Financing Receivable, Impaired [Line Items]
Average recorded investment	800	200
Financing receivable, accrual status	786
Financing receivable, nonaccrual status		153
Troubled Debt Restructuring \| Nonperforming
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, related allowance		$ 34
Troubled Debt Restructuring \| Performing
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, related allowance	$ 138

Guarantee percentage of SBA Loan

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+ References

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
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Financing receivables that are current.

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-Section 50
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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of allowance for credit losses related to recorded investment.

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