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		9 Months Ended		21 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017
Average recorded investment [Abstract]
Average recorded investment	$ 5,284,000	$ 5,835,000	$ 5,865,000	$ 6,332,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	28,000	28,000	82,000	85,000
Interest income recognized [Abstract]
Interest income recognized			0	0	$ 0
Commercial real estate
Average recorded investment [Abstract]
Average recorded investment	882,000	867,000	1,126,000	1,185,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Interest income recognized [Abstract]
Interest income recognized	0	0	0	0
Construction and land development
Average recorded investment [Abstract]
Average recorded investment	128,000	144,000	133,000	145,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Interest income recognized [Abstract]
Interest income recognized	0	0	0	0
Commercial and industrial
Average recorded investment [Abstract]
Average recorded investment	1,667,000	2,258,000	1,880,000	2,373,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	26,000	28,000	76,000	85,000
Interest income recognized [Abstract]
Interest income recognized	0	0	0	0
Residential real estate
Average recorded investment [Abstract]
Average recorded investment	718,000	670,000	590,000	765,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	2,000	0	6,000	0
Interest income recognized [Abstract]
Interest income recognized	0	0	0	0
Leases
Average recorded investment [Abstract]
Average recorded investment	1,359,000	993,000	1,049,000	873,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Interest income recognized [Abstract]
Interest income recognized	0	0	0	0
Tax certificates
Average recorded investment [Abstract]
Average recorded investment	530,000	903,000	1,087,000	991,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Interest income recognized [Abstract]
Interest income recognized	$ 0	$ 0	$ 0	$ 0