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Allowance for Loan and Lease Losses - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Ending balance | $ 41,358 |  | $ 39,771 |  |  |
Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 376 |  | 441 |  |  |
Collectively evaluated for impairment | 40,913 |  | 39,245 |  |  |
Ending balance | 41,289 | $ 41,111 | 39,686 | $ 37,903 | $ 36,960 | $ 35,598
Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 25 |  |  |
Collectively evaluated for impairment | 69 |  | 60 |  |  |
Ending balance | 69 | 114 | 85 | 135 | 197 | 157
Commercial and industrial | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 376 |  | 441 |  |  |
Collectively evaluated for impairment | 12,045 |  | 11,371 |  |  |
Ending balance | 12,421 | 12,866 | 11,812 | 11,690 | 10,842 | 9,389
Commercial and industrial | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 25 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Ending balance | 0 | 19 | 25 | 0 | 50 | 0
Commercial real estate | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 21,172 |  | 20,412 |  |  |
Ending balance | 21,172 | 20,770 | 20,412 | 19,455 | 19,121 | 19,836
Commercial real estate | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Ending balance | 0 | 25 | 0 | 75 | 87 | 97
Residential real estate | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 6,445 |  | 6,161 |  |  |
Ending balance | 6,445 | 6,147 | 6,161 | 5,491 | 5,761 | 5,149
Residential real estate | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 64 |  | 54 |  |  |
Ending balance | 64 | 65 | 54 | 54 | 54 | 54
Consumer and other | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 1,251 |  | 1,301 |  |  |
Ending balance | 1,251 | 1,328 | 1,301 | 1,267 | 1,236 | 1,224
Consumer and other | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 5 |  | 6 |  |  |
Ending balance | 5 | 5 | 6 | 6 | 6 | 6
Finance Leases | Originated Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Ending balance | 0 | 0 | 0 | 0 | 0 | 0
Finance Leases | Total Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 0 |  | 0 |  |  |
Ending balance | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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