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		6 Months Ended		18 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017
Average recorded investment [Abstract]
Average recorded investment	$ 5,864,000	$ 6,278,000	$ 6,359,000	$ 6,598,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	27,000	27,000	54,000	57,000
Interest income recognized [Abstract]
Interest income recognized			0	0	$ 0
Commercial real estate
Average recorded investment [Abstract]
Average recorded investment	1,230,000	1,239,000	1,230,000	1,323,000
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	145,000	135,000	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	1,871,000	2,313,000	1,972,000	2,429,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	25,000	27,000	50,000	57,000
Interest income recognized [Abstract]
Interest income recognized	0	0	0	0
Residential real estate
Average recorded investment [Abstract]
Average recorded investment	582,000	764,000	610,000	807,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	2,000	0	4,000	0
Interest income recognized [Abstract]
Interest income recognized	0	0	0	0
Leases
Average recorded investment [Abstract]
Average recorded investment	1,115,000	756,000	1,067,000	835,000
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	938,000	1,061,000	1,345,000	1,059,000
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