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Business Combinations and Divestitures - Narrative (Details) |  |  | 12 Months Ended |  |  |
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Jun. 01, 2021 USD ($) | Jul. 08, 2020 USD ($) client shares | Dec. 31, 2021 USD ($) asset | Dec. 31, 2020 USD ($) | Sep. 23, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 233,727,000 | $ 163,209,000 |  |  |
Misdirected payments |  |  | 4,867,572,000 | 4,996,776,000 |  |  |
Unsecured federal funds line of credit |  |  | 227,500,000 |  |  |  |
Other income |  |  |  | 50,627,000 |  |  |
Indemnification asset |  |  | 4,786,000 | 36,225,000 |  |  |
Loans |  |  | 4,825,359,000 | 4,901,037,000 |  |  |
Gain (loss) on indemnification asset |  |  | 4,194,000 |  |  |  |
Indemnification asset, expected cash payments to be received |  |  | 5,038,000 | 39,200,000 |  |  |
Required payments |  | $ 45,228,000 |  |  |  |  |
Fair value of factored receivables purchased |  | 44,962,000 |  |  |  |  |
Factored receivables |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Misdirected payments |  |  | 1,699,537,000 | 1,120,770,000 |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Indemnification asset |  |  | 4,786,000 | 36,225,000 |  |  |
Level 3 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Indemnification asset |  |  | 4,786,000 | 36,225,000 |  | $ 0 | $ 0
Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Indemnification asset |  |  | 4,786,000 | 36,225,000 |  |  |
Over-Formula Advances | Factored receivables |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Misdirected payments |  | 62,200,000 | $ 10,077,000 | 62,100,000 |  |  |
Minimum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 4 years |  |  |  |
Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 11 years |  |  |  |
Capitalized Software | Minimum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |  |
Capitalized Software | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 5 years |  |  |  |
HubTran, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 73,697,000 |  | $ 70,459,000 |  |  |  |
Acquisition-related expenses |  |  | 2,992,000 |  |  |  |
Cash paid | 97,096,000 |  |  |  |  |  |
HubTran, Inc. | Capitalized Software |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets | 16,932,000 |  | $ 16,932,000 |  |  |  |
Estimated useful lives |  |  | 4 years |  |  |  |
HubTran, Inc. | Customer Relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets | $ 10,360,000 |  | $ 10,360,000 |  |  |  |
Estimated useful lives |  |  | 11 years |  |  |  |
Number of customer relationship intangible assets | asset |  |  | 2 |  |  |  |
Transport Financial Solutions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 4,466,000 | $ 4,525,000 |  |  |  |
Estimated useful lives |  | 8 years |  |  |  |  |
Cash paid |  | $ 108,375,000 |  |  |  |  |
Equity issued (in shares) | shares |  | 630,268 |  |  |  |  |
Stock consideration |  | $ 13,942,000 |  |  |  |  |
Number of large clients | client |  | 3 |  |  |  |  |
Portion of purchase price returned (in shares) | shares |  |  |  |  | 630,268 |  |
Receivable due from seller subsequent to liquidation of stock consideration |  | $ 17,196,000 |  |  |  |  |
Proceeds from sale of acquired stock |  |  |  | 28,064,000 |  |  |
Other income |  |  |  | 10,868,000 |  |  |
Intangible assets |  | 3,500,000 | 3,500,000 |  |  |  |
Indemnification asset |  | 30,959,000 | 30,959,000 |  |  |  |
Indemnification asset, charge off |  |  | 41,265,000 |  |  |  |
Indemnification asset, allowance for credit loss, loss expense |  |  | 2,844,000 |  |  |  |
Expenses related to the acquisition |  |  |  | $ 827,000 |  |  |
Transport Financial Solutions | Covenant Logistics Group, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loans |  |  | 35,633,000 |  |  |  |
Transport Financial Solutions | Indemnification Agreement |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percent indemnified, first portion |  |  |  |  | 100.00% |  |
First increment of losses incurred |  |  |  |  | $ 30,000,000 |  |
Percent indemnified, second portion |  |  |  |  | 50.00% |  |
Second increment of losses incurred |  |  |  |  | $ 30,000,000 |  |
Total indemnification amount |  |  |  |  | 45,000,000 |  |
Collateral held by third parties |  |  |  |  | 60,000,000 |  |
Transport Financial Solutions | Indemnification Agreement | Covenant Logistics Group, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Unsecured federal funds line of credit |  |  |  |  | 45,000,000 |  |
Line of credit facility, remaining borrowing capacity |  |  | 9,361,000 |  |  |  |
Transport Financial Solutions | Over-Formula Advances |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Misdirected payments |  | 62,200,000 |  |  | $ 62,200,000 |  |
Transport Financial Solutions | Over-Formula Advances | Factored receivables |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Misdirected payments |  |  | $ 62,200,000 |  |  |  |
Transport Financial Solutions | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  | $ 9,900,000 |  |  |  |  |

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