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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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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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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