Loans and Allowance for Loan and Lease Losses - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) loan	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Net deferred origination and factoring fees	$ 1,114,096	$ 1,114,096		$ 1,218,000
Pledged loans	290,975,000	290,975,000		280,289,000
Loans transferred to loans held for sale	1,238,000	4,119,000	$ 0
Loans transferred to loans held for sale at fair value	1,233,000	4,038,000
Recorded investments in troubled debt restructurings	6,148,000	$ 6,148,000		1,383,000
Number of defaults on modified loans | loan		0
Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Customer reserves	23,854,000	$ 23,854,000		$ 21,188,000
Other non interest income
Accounts Notes And Loans Receivable [Line Items]
Decline in fair value of loans held sale	$ 5,000	$ 81,000