Allowance for Loan and Lease Losses - Impaired LHFI - Average Recorded Investment and Interest Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Average recorded investment [Abstract]
Average recorded investment	$ 5,835,000	$ 10,622,000	$ 6,332,000	$ 13,077,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	28,000	77,000	85,000	239,000
Interest income recognized [Abstract]
Interest income recognized	0	97,000	0	232,000
Commercial real estate [Member]
Average recorded investment [Abstract]
Average recorded investment	867,000	4,256,000	1,185,000	5,599,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	33,000	0	97,000
Interest income recognized [Abstract]
Interest income recognized	0	97,000	0	232,000
Construction and land development [Member]
Average recorded investment [Abstract]
Average recorded investment	144,000	471,000	145,000	562,000
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 [Member]
Average recorded investment [Abstract]
Average recorded investment	2,258,000	3,570,000	2,373,000	4,740,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	28,000	44,000	85,000	142,000
Interest income recognized [Abstract]
Interest income recognized	0	0	0	0
Residential real estate [Member]
Average recorded investment [Abstract]
Average recorded investment	670,000	927,000	765,000	952,000
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
Leases [Member]
Average recorded investment [Abstract]
Average recorded investment	993,000	289,000	873,000	146,000
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 [Member]
Average recorded investment [Abstract]
Average recorded investment	903,000	1,109,000	991,000	1,078,000
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