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	Dec. 31, 2015
Unpaid principal balance [Abstract]
With no related allowance recorded	$ 5,415	$ 10,197
With an allowance recorded	7,048	5,335
Recorded investment [Abstract]
With no related allowance recorded	4,446	4,777
With an allowance recorded	2,509	2,414
Related allowance [Abstract]
Related allowance	368	398
Average recorded investment [Abstract]
With no related allowance recorded	4,428	9,738
With an allowance recorded	1,816	1,965
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	111	279
Interest income recognized [Abstract]
With no related allowance recorded		234
Commercial real estate [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded	362	1,323
With an allowance recorded	936	926
Recorded investment [Abstract]
With no related allowance recorded	362	931
With an allowance recorded	542	538
Related allowance [Abstract]
Related allowance	3	77
Average recorded investment [Abstract]
With no related allowance recorded	923	4,144
With an allowance recorded	168	334
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		101
Interest income recognized [Abstract]
With no related allowance recorded		233
Construction and land development [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded	546	546
Recorded investment [Abstract]
With no related allowance recorded	144	145
Average recorded investment [Abstract]
With no related allowance recorded	145	376
With an allowance recorded		90
Commercial and industrial [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded	2,209	2,662
With an allowance recorded		2,500
Recorded investment [Abstract]
With no related allowance recorded	2,105	2,576
With an allowance recorded		111
Related allowance [Abstract]
Related allowance		100
Average recorded investment [Abstract]
With no related allowance recorded	2,296	4,314
With an allowance recorded	17	172
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	107	178
Interest income recognized [Abstract]
With no related allowance recorded		1
Residential real estate [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded	133
With an allowance recorded	668	1,033
Recorded investment [Abstract]
With no related allowance recorded	83
With an allowance recorded	570	889
Related allowance [Abstract]
Related allowance	17	27
Average recorded investment [Abstract]
With no related allowance recorded	45
With an allowance recorded	695	938
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	4
Leases [Member]
Unpaid principal balance [Abstract]
With an allowance recorded	1,242	876
Recorded investment [Abstract]
With an allowance recorded	1,242	876
Related allowance [Abstract]
Related allowance	340	194
Average recorded investment [Abstract]
With an allowance recorded	910	243
Tax certificates [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded	2,165	5,666
With an allowance recorded	4,202
Recorded investment [Abstract]
With no related allowance recorded	1,752	1,125
With an allowance recorded	155
Related allowance [Abstract]
Related allowance	8
Average recorded investment [Abstract]
With no related allowance recorded	1,019	904
With an allowance recorded	$ 26	$ 188