Allowance for Loan and Lease Losses - Loans that were Evaluated for Impairment by Loan Segment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Jun. 30, 2017
Unpaid principal balance [Abstract]
With no related allowance recorded	$ 5,415	$ 4,113
With an allowance recorded	7,048	5,895
Recorded investment [Abstract]
With no related allowance recorded	4,446	3,246
With an allowance recorded	2,509	1,722
Related allowance [Abstract]
Related allowance	368	225
Average recorded investment [Abstract]
With no related allowance recorded	4,428
With an allowance recorded	1,816
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	111
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0
Interest income recognized [Abstract]
With no related allowance recorded	0
With an allowance recorded	0
Commercial real estate
Unpaid principal balance [Abstract]
With no related allowance recorded	362	893
With an allowance recorded	936	642
Recorded investment [Abstract]
With no related allowance recorded	362	806
With an allowance recorded	542	525
Related allowance [Abstract]
Related allowance	3	16
Average recorded investment [Abstract]
With no related allowance recorded	923
With an allowance recorded	168
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0
Interest income recognized [Abstract]
With no related allowance recorded	0
With an allowance recorded	0
Construction and land development
Unpaid principal balance [Abstract]
With no related allowance recorded	546	531
Recorded investment [Abstract]
With no related allowance recorded	144	128
Average recorded investment [Abstract]
With no related allowance recorded	145
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0
Interest income recognized [Abstract]
With no related allowance recorded	0
Commercial and industrial
Unpaid principal balance [Abstract]
With no related allowance recorded	2,209	1,860
With an allowance recorded	0
Recorded investment [Abstract]
With no related allowance recorded	2,105	1,859
With an allowance recorded	0
Related allowance [Abstract]
Related allowance	0
Average recorded investment [Abstract]
With no related allowance recorded	2,296
With an allowance recorded	17
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	107
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0
Interest income recognized [Abstract]
With no related allowance recorded	0
With an allowance recorded	0
Residential real estate
Unpaid principal balance [Abstract]
With no related allowance recorded	133	178
With an allowance recorded	668	4,194
Recorded investment [Abstract]
With no related allowance recorded	83	89
With an allowance recorded	570	138
Related allowance [Abstract]
Related allowance	17	14
Average recorded investment [Abstract]
With no related allowance recorded	45
With an allowance recorded	695
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	4
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0
Interest income recognized [Abstract]
With no related allowance recorded	0
With an allowance recorded	0
Leases
Unpaid principal balance [Abstract]
With an allowance recorded	1,242	1,059
Recorded investment [Abstract]
With an allowance recorded	1,242	1,059
Related allowance [Abstract]
Related allowance	340	195
Average recorded investment [Abstract]
With an allowance recorded	910
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0
Interest income recognized [Abstract]
With an allowance recorded	0
Tax certificates
Unpaid principal balance [Abstract]
With no related allowance recorded	2,165	651
With an allowance recorded	4,202
Recorded investment [Abstract]
With no related allowance recorded	1,752	$ 364
With an allowance recorded	155
Related allowance [Abstract]
Related allowance	8
Average recorded investment [Abstract]
With no related allowance recorded	1,019
With an allowance recorded	26
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0
Interest income recognized [Abstract]
With no related allowance recorded	0
With an allowance recorded	$ 0

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Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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