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Loans and Allowance for Credit Losses (Allowance for Credit Losses on Loans Receivable with Impairment) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | $ 1,119,937 | $ 1,093,514
Allowance for credit losses allocated to: |  |
Loans and leases receivable, allowance, total | 9,918 | 9,781
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 3,977 | 6,975
Loans collectively evaluated for impairment | 126,478 | 118,771
Total loans | 130,455 | 125,746
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 469 | 500
Loans collectively evaluated for impairment | 2,072 | 1,960
Loans and leases receivable, allowance, total | 2,541 | 2,460
Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 5,969 | 6,018
Loans collectively evaluated for impairment | 395,390 | 393,172
Total loans | 401,359 | 399,190
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 237 | 239
Loans collectively evaluated for impairment | 2,122 | 2,045
Loans and leases receivable, allowance, total | 2,359 | 2,284
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 6,426 | 4,967
Loans collectively evaluated for impairment | 471,379 | 459,920
Total loans | 477,805 | 464,887
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 36 | 33
Loans collectively evaluated for impairment | 2,607 | 2,561
Loans and leases receivable, allowance, total | 2,643 | 2,594
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 363 | 337
Loans collectively evaluated for impairment | 103,903 | 96,947
Total loans | 104,266 | 97,284
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 59 | 33
Loans collectively evaluated for impairment | 2,099 | 2,208
Loans and leases receivable, allowance, total | 2,158 | 2,241
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans collectively evaluated for impairment | 6,052 | 6,407
Total loans | 6,052 | 6,407
Allowance for credit losses allocated to: |  |
Loans collectively evaluated for impairment | 217 | 202
Loans and leases receivable, allowance, total | 217 | 202
Unallocated Financing Receivables [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 16,735 | 18,297
Loans collectively evaluated for impairment | 1,103,202 | 1,075,217
Total loans | 1,119,937 | 1,093,514
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 801 | 805
Loans collectively evaluated for impairment | 9,117 | 8,976
Loans and leases receivable, allowance, total | $ 9,918 | $ 9,781

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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