Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	$ 18,504	$ 20,923
New TDRs	345	3,630
Disbursements (payments)	(1,195)	(3,263)
Charge offs	(89)	(638)
Reclassifications/transfer in/(out)	(108)
Payoffs	(586)	(179)
TDR ending balance	16,871	20,473
TDR, related allowance	875	1,211
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	5,504	5,428
New TDRs	345	2,570
Disbursements (payments)	(952)	(2,329)
Charge offs		(521)
Reclassifications/transfer in/(out)	(1,519)	2,053
TDR ending balance	3,378	7,201
TDR, related allowance	571	947
Impaired Nonaccrual Loans [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	1,603	445
Disbursements (payments)	(66)	(294)
Reclassifications/transfer in/(out)	(1,411)	1,595
TDR ending balance	126	1,746
TDR, related allowance	23	25
Impaired Nonaccrual Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	83
Charge offs		(258)
Reclassifications/transfer in/(out)		458
TDR ending balance	83	200
TDR, related allowance		112
Impaired Nonaccrual Loans [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
New TDRs	345
Disbursements (payments)	(4)
TDR ending balance	341
Impaired Nonaccrual Loans [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance		23
Disbursements (payments)		(23)
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	3,818	4,960
New TDRs		2,570
Disbursements (payments)	(882)	(2,012)
Charge offs		(263)
Reclassifications/transfer in/(out)	(108)
TDR ending balance	2,828	5,255
TDR, related allowance	548	810
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	13,000	15,495
New TDRs		1,060
Disbursements (payments)	(243)	(934)
Charge offs	(89)	(117)
Reclassifications/transfer in/(out)	1,411	(2,053)
Payoffs	(586)	(179)
TDR ending balance	13,493	13,272
TDR, related allowance	304	264
Impaired Accruing Restructured Loans [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	3,875	5,686
New TDRs		565
Disbursements (payments)	(120)	(375)
Charge offs	(89)
Reclassifications/transfer in/(out)	1,411	(1,595)
Payoffs	(452)	(179)
TDR ending balance	4,625	4,102
TDR, related allowance	228	154
Impaired Accruing Restructured Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	4,936	5,740
New TDRs		495
Disbursements (payments)	(101)	(689)
Charge offs		(117)
Reclassifications/transfer in/(out)		(458)
TDR ending balance	4,835	4,971
TDR, related allowance	35	89
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	4,189	4,069
Disbursements (payments)	(22)	130
Payoffs	(134)
TDR ending balance	4,033	4,199
TDR, related allowance	$ 41	$ 21

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- Definition

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

+ References

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+ References

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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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