Allowance for Loan and Lease Losses - Impaired LHFI - Average Recorded Investment and Interest Income (Details) - USD ($)	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Average recorded investment [Abstract]
Average recorded investment	$ 6,884,000	$ 15,198,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	30,000	81,000
Interest income recognized [Abstract]
Interest income recognized	0	135,000
Commercial real estate [Member]
Average recorded investment [Abstract]
Average recorded investment	1,418,000	6,643,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	32,000
Interest income recognized [Abstract]
Interest income recognized	0	135,000
Construction and land development [Member]
Average recorded investment [Abstract]
Average recorded investment	145,000	642,000
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 [Member]
Average recorded investment [Abstract]
Average recorded investment	2,516,000	5,779,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	30,000	49,000
Interest income recognized [Abstract]
Interest income recognized	0	0
Residential real estate [Member]
Average recorded investment [Abstract]
Average recorded investment	860,000	962,000
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
Leases [Member]
Average recorded investment [Abstract]
Average recorded investment	894,000	68,000
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 [Member]
Average recorded investment [Abstract]
Average recorded investment	1,051,000	1,104,000
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

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=49124121&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=49124121&loc=d3e5258-111524

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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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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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