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Loans and Allowance for Loan and Lease Losses - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($) loan	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Premiums and discounts on acquired loans	$ 20,869,000		$ 20,869,000			$ 18,706,000
Net deferred origination and factoring fees	3,136,000		3,136,000			2,944,000
Pledged loans	680,070,000		680,070,000			596,230,000
Loans transferred to loans held for sale	0	$ 0		$ 1,965,000
Proceeds from loans transferred to loans held for sale			0	1,919,000
Losses on transfer of loans to loans held for sale				(46,000)
Recorded investments in troubled debt restructurings	7,530,000		7,530,000			19,137,000
Allowance for loan and lease losses	27,256,000	20,367,000	$ 27,256,000	$ 20,367,000	$ 24,547,000	18,748,000	$ 19,797,000	$ 15,405,000
Number of defaults on modified loans | loan			1	4
Recorded investments in troubled debt restructurings			$ 156,000	$ 2,999,000
Recorded investment charged off amount	4,591,000	1,162,000	6,624,000	6,560,000
Troubled Debt Restructuring
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan and lease losses	640,000		640,000			535,000
Recorded investment charged off amount				2,702,000
Other non interest income
Accounts Notes And Loans Receivable [Line Items]
Losses on transfer of loans to loans held for sale				(46,000)
Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Customer reserves	54,917,000		54,917,000			32,459,000
Allowance for loan and lease losses	7,571,000	5,046,000	7,571,000	5,046,000	7,727,000	4,597,000	4,507,000	4,088,000
Recorded investment charged off amount	228,000	136,000	928,000	1,102,000
1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan and lease losses	259,000	282,000	259,000	282,000	$ 240,000	$ 293,000	$ 149,000	$ 253,000
Recorded investment charged off amount	3,000	$ 1,000	17,000	$ 29,000
1-4 family residential properties | Real Eatate Loans
Accounts Notes And Loans Receivable [Line Items]
Residential real estate loans in process of foreclosure	$ 21,000		$ 21,000

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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