Loans - Troubled Debt Restructuring (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) loan	Sep. 30, 2015 USD ($) loan	Sep. 30, 2016 USD ($) loan	Sep. 30, 2015 USD ($) loan	Dec. 31, 2015 USD ($)
Financing Receivable, Impaired [Line Items]
Average recorded investment	$ 4,108	$ 10,502	$ 4,937	$ 10,661
Impaired financing receivable, related allowance	604		604		$ 842
Loans receivable, nonaccrual status	$ 6,527		$ 6,527		7,260
Number of loans modified as a TDR | loan	0	0	0	0
Troubled Debt Restructuring (TDR)
Financing Receivable, Impaired [Line Items]
Average recorded investment			$ 820	$ 3,300
Impaired financing receivable, related allowance	$ 34		34		208
Troubled Debt Restructuring (TDR) | Nonperforming
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, related allowance					41
Troubled Debt Restructuring (TDR) | Performing
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, related allowance					167
SBA loans held for investment
Financing Receivable, Impaired [Line Items]
Average recorded investment	1,341	$ 1,773	1,662	$ 1,881
Impaired financing receivable, related allowance	351		351		705
Loans receivable, nonaccrual status	1,967		1,967		1,764
Non Accrual | Troubled Debt Restructuring (TDR)
Financing Receivable, Impaired [Line Items]
Loans receivable, nonaccrual status	$ 154		$ 154		$ 293