Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	$ 16,624	$ 18,504
New TDRs		345
Disbursements (payments)	(161)	(1,119)
Charge offs	(379)	(89)
Reclassifications/transfer in/(out)		(108)
Payoffs	(3,056)	(584)
TDR ending balance	13,028	16,949
TDR, related allowance	421	923
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	3,298	5,504
New TDRs		345
Disbursements (payments)	(44)	(916)
Reclassifications/transfer in/(out)	154	(108)
TDR ending balance	3,408	4,825
TDR, related allowance	421	690
Impaired Nonaccrual Loans [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance		1,603
Disbursements (payments)		(44)
Reclassifications/transfer in/(out)	154
TDR ending balance	154	1,559
TDR, related allowance		110
Impaired Nonaccrual Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	83	83
TDR ending balance	83	83
Impaired Nonaccrual Loans [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	337
New TDRs		345
Disbursements (payments)	(4)
TDR ending balance	333	345
TDR, related allowance	29
Impaired Nonaccrual Loans [Member] \| Construction Loans [Member] \| Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	2,878	3,818
Disbursements (payments)	(40)	(872)
Reclassifications/transfer in/(out)		(108)
TDR ending balance	2,838	2,838
TDR, related allowance	392	580
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	13,326	13,000
Disbursements (payments)	(117)	(203)
Charge offs	(379)	(89)
Reclassifications/transfer in/(out)	(154)
Payoffs	(3,056)	(584)
TDR ending balance	9,620	12,124
TDR, related allowance		233
Impaired Accruing Restructured Loans [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	4,536	3,875
Disbursements (payments)	(42)	(102)
Charge offs		(89)
Reclassifications/transfer in/(out)	(154)
Payoffs	(237)	(450)
TDR ending balance	4,103	3,234
TDR, related allowance		145
Impaired Accruing Restructured Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	4,818	4,936
Disbursements (payments)	(69)	(83)
Payoffs	(219)
TDR ending balance	4,530	4,853
TDR, related allowance		75
Impaired Accruing Restructured Loans [Member] \| Construction Loans [Member] \| Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	3,972	4,189
Disbursements (payments)	(6)	(18)
Charge offs	(379)
Payoffs	(2,600)	(134)
TDR ending balance	$ 987	4,037
TDR, related allowance		$ 13

Financing receivables, impaired, troubled debt restructuring, balance.

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- Definition

Financing receivables, impaired, troubled debt restructuring, disbursements (payments received).

+ References

No definition available.

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- Definition

Financing receivables, impaired, troubled debt restructuring, new.

+ References

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- Definition

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+ References

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- Definition

Financing receivables, impaired, troubled debt restructuring period increase (decrease).

+ References

No definition available.

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- Definition

Financing receivables, impaired, troubled debt restructuring related allowance.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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