Allowance for Loan and Lease Losses - Allocation of Allowance For Loan and Lease Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending balance	$ 39,771	$ 35,755
Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	441	417
Collectively evaluated for impairment	39,245	35,181
Ending balance	39,686	35,598	$ 31,312
Acquired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	25	76
Collectively evaluated for impairment	60	81
Ending balance	85	157	692
Commercial and industrial \| Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	441	95
Collectively evaluated for impairment	11,371	9,294
Ending balance	11,812	9,389	10,495
Commercial and industrial \| Acquired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	25	0
Collectively evaluated for impairment	0	0
Ending balance	25	0	433
Commercial real estate \| Originated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	322
Collectively evaluated for impairment	20,412	19,514
Ending balance	20,412	19,836	15,479
Commercial real estate \| Acquired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	76
Collectively evaluated for impairment	0	21
Ending balance	0	97	61
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	6,161	5,149
Ending balance	6,161	5,149	4,070
Residential real estate \| Acquired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	54	54
Ending balance	54	54	198
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	1,301	1,224
Ending balance	1,301	1,224	1,268
Consumer and other \| Acquired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	6	6
Ending balance	6	6	0
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
Finance Leases \| Acquired 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

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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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

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