Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: 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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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Allowance for Loan and Lease Losses - Impaired LHFI - Average Recorded Investment and Interest Income (Details) - USD ($)	3 Months Ended		15 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017
Average recorded investment [Abstract]
Average recorded investment	$ 7,052,000	$ 6,884,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	27,000	30,000
Interest income recognized [Abstract]
Interest income recognized	0	0	$ 0
Commercial real estate
Average recorded investment [Abstract]
Average recorded investment	1,267,000	1,418,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Interest income recognized [Abstract]
Interest income recognized	0	0
Construction and land development
Average recorded investment [Abstract]
Average recorded investment	140,000	145,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Interest income recognized [Abstract]
Interest income recognized	0	0
Commercial and industrial
Average recorded investment [Abstract]
Average recorded investment	2,099,000	2,516,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	25,000	30,000
Interest income recognized [Abstract]
Interest income recognized	0	0
Residential real estate
Average recorded investment [Abstract]
Average recorded investment	645,000	860,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	2,000	0
Interest income recognized [Abstract]
Interest income recognized	0	0
Leases
Average recorded investment [Abstract]
Average recorded investment	1,051,000	894,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Interest income recognized [Abstract]
Interest income recognized	0	0
Tax certificates
Average recorded investment [Abstract]
Average recorded investment	1,850,000	1,051,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Interest income recognized [Abstract]
Interest income recognized	$ 0	$ 0