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Loans and Allowance for Loan and Lease Losses - Additional Information (Details) | 12 Months Ended |
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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% |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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