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Factored receivables as a percent of total loans.

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Percentage of factored receivables purchased from trucking fleets and owner-operators in the transportation industry.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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The cash inflow from Sales of Loans Held For Investment.

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Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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Loans and Allowance for Loan and Lease Losses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Premiums and discounts on acquired loans	$ 19,514,000	$ 18,706,000
Net deferred origination and factoring fees	$ 2,579,000	$ 2,944,000
Percentage of total loan portfolio on factored receivables	14.00%	10.00%
Majority of factored receivables percentage of loan portfolio	79.00%	77.00%
Pledged loans	$ 847,523,000	$ 596,230,000
Loans transferred to loans held for sale	9,781,000	3,914,000	$ 24,384,000
Proceeds from loans transferred to loans held for sale	9,781,000	3,834,000	24,538,000
Gain (loss) on transfer of loans to loans held for sale		(80,000)	154,000
Recorded investments in troubled debt restructurings	6,847,000	19,137,000
Allowance for loan and lease losses	$ 27,571,000	$ 18,748,000	15,405,000	$ 12,567,000
Number of defaults on modified loans \| loan	0	0
Troubled Debt Restructuring
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan and lease losses	$ 286,000	$ 535,000
Other non interest income
Accounts Notes And Loans Receivable [Line Items]
Gain (loss) on transfer of loans to loans held for sale	0	(80,000)	154,000
Factored receivables
Accounts Notes And Loans Receivable [Line Items]
Customer reserves	58,566,000	32,459,000
Allowance for loan and lease losses	7,299,000	4,597,000	4,088,000	4,509,000
Commercial Loans
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan and lease losses	12,865,000	8,150,000	8,014,000	5,276,000
Recorded investments in troubled debt restructurings			$ 2,011,000
Number of defaults on modified loans \| loan			14
1-4 family residential properties
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan and lease losses	317,000	$ 293,000	$ 253,000	$ 274,000
1-4 family residential properties \| Real Eatate Loans
Accounts Notes And Loans Receivable [Line Items]
Residential real estate loans in process of foreclosure	$ 926,000
Geographic Concentration Risk \| Accounts Receivable
Accounts Notes And Loans Receivable [Line Items]
Percentage of customers located within states	73.00%	74.00%
Colorado \| Geographic Concentration Risk \| Accounts Receivable
Accounts Notes And Loans Receivable [Line Items]
Percentage of customers located within states	27.00%	26.00%
Illinois \| Geographic Concentration Risk \| Accounts Receivable
Accounts Notes And Loans Receivable [Line Items]
Percentage of customers located within states	15.00%	17.00%
Iowa \| Geographic Concentration Risk \| Accounts Receivable
Accounts Notes And Loans Receivable [Line Items]
Percentage of customers located within states	7.00%	7.00%
Texas \| Geographic Concentration Risk \| Accounts Receivable
Accounts Notes And Loans Receivable [Line Items]
Percentage of customers located within states	24.00%	24.00%