Allowance for Loan and Lease Losses - Impaired LHFI - Average Recorded Investment and Interest Income (Details) - USD ($)	3 Months Ended		6 Months Ended		15 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016
Average recorded investment [Abstract]
Average recorded investment	$ 6,278,000	$ 13,270,000	$ 6,598,000	$ 14,142,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	27,000	81,000	57,000	162,000
Interest income recognized [Abstract]
Interest income recognized	0	0	0	135,000	$ 0
Commercial real estate [Member]
Average recorded investment [Abstract]
Average recorded investment	1,239,000	5,843,000	1,323,000	6,231,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	0	32,000	0	64,000
Interest income recognized [Abstract]
Interest income recognized	0	0	0	135,000
Construction and land development [Member]
Average recorded investment [Abstract]
Average recorded investment	145,000	584,000	145,000	611,000
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	2,313,000	4,856,000	2,429,000	5,216,000
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	27,000	49,000	57,000	98,000
Interest income recognized [Abstract]
Interest income recognized	0	0	0	0
Residential real estate [Member]
Average recorded investment [Abstract]
Average recorded investment	764,000	971,000	807,000	963,000
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	756,000	73,000	835,000	70,000
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	1,061,000	943,000	1,059,000	1,051,000
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