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Business Combinations and Divestitures - Additional Information (Details) |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 USD ($) | Sep. 08, 2018 USD ($) Branch | Jun. 02, 2018 USD ($) | Jan. 19, 2018 | Dec. 09, 2017 USD ($) locations | Oct. 06, 2017 USD ($) Branch | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 158,728,000 |  |  |  |  |  |  | $ 158,728,000 |  | $ 44,126,000 | $ 158,728,000
Valley Bank & Trust |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of locations | locations |  |  |  |  | 7 |  |  |  |  |  |
Triumph Healthcare Finance |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal of group agreement date |  |  |  | Jan. 19, 2018 |  |  |  |  |  |  |
Disposal of group closing date |  |  |  | Mar. 16, 2018 |  |  |  |  |  |  |
Triumph Capital Advisors, LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, related costs |  |  |  |  |  |  | $ 400,000 |  |  |  |
Portion of consideration received |  |  |  |  |  |  | $ 10,500,000 |  |  |  |
Percentage of annual earn-out payment |  |  |  |  |  |  | 3.00% |  |  |  |
Maximum earn-out amount |  |  |  |  |  |  | $ 2,500,000 |  |  |  |
Contingent consideration asset, estimated fair value | 1,725,000 |  |  |  |  |  | 1,623,000 | 1,725,000 |  |  | 1,725,000
Cash proceeds from the revenue share |  |  |  |  |  |  |  |  |  |  | $ 174,000
Triumph Capital Advisors, LLC | Loans Receivable |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Portion of consideration received |  |  |  |  |  |  | $ 10,500,000 |  |  |  |
Term credit facility, maturity date |  |  |  |  |  |  | Mar. 31, 2023 |  |  |  |
Triumph Capital Advisors, LLC | Interest Rate Floor | Loans Receivable |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term credit facility, interest rate |  |  |  |  |  |  | 5.50% |  |  |  |
First National Bank of Durango | Durango, Colorado |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of branches acquired | Branch |  | 4 |  |  |  |  |  |  |  |  |
First National Bank of Durango | Bayfield, Colorado |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of branches acquired | Branch |  | 1 |  |  |  |  |  |  |  |  |
Bank of New Mexico | Albuquerque, Gallup and Grants, New Mexico |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of branches acquired | Branch |  | 3 |  |  |  |  |  |  |  |  |
Citizens Bank of Pagosa Springs | Pagosa Springs, Colorado |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of branches acquired | Branch |  | 2 |  |  |  |  |  |  |  |  |
First Bancorp of Durango, Inc. And Southern Colorado Corp. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 72,060,000 |  |  |  |  |  |  |  |  |
Finite lived intangible assets, Amortization period |  | 10 years |  |  |  |  |  |  |  |  |
Business acquisition, related costs |  |  |  |  |  |  |  | $ 5,871,000,000 |  |  |
Interstate Capital Corporation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 42,975,000 |  |  |  |  |  |  |  |
Business acquisition, related costs |  |  |  |  |  |  |  |  | $ 1,094,000 |  |
Date of acquisition completion date |  |  | Jun. 02, 2018 |  |  |  |  |  |  |  |
Fair value of consideration paid included contingent consideration |  |  | $ 20,000,000 |  |  |  |  |  |  |  |
Interstate Capital Corporation | Factoring |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 42,975,000 |  |  |  |  |  |  |  |
Fair value of consideration paid included contingent consideration | $ 20,487,000 |  | 20,000,000 |  |  |  |  |  |  |  |
Interstate Capital Corporation | Factoring | Minimum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration paid included contingent consideration |  |  | 0 |  |  |  |  |  |  |  |
Interstate Capital Corporation | Factoring | Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration paid included contingent consideration |  |  | $ 22,000,000 |  |  |  |  |  |  |  |
Interstate Capital Corporation | Factoring | Customer Relationship |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, Amortization period |  |  | 8 years |  |  |  |  |  |  |  |
Finite-lived intangible assets, fair value |  |  | $ 13,500,000 |  |  |  |  |  |  |  |
Interstate Capital Corporation | Factoring | Trade Name |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, Amortization period |  |  | 3 years |  |  |  |  |  |  |  |
Finite-lived intangible assets, fair value |  |  | $ 420,000 |  |  |  |  |  |  |  |
Valley Bancorp, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 10,523,000 |  |  |  |  |  |
Business acquisition, related costs |  |  |  |  |  |  |  |  |  | 1,251,000 |
Date of acquisition completion date |  |  |  |  | Dec. 09, 2017 |  |  |  |  |  |
Valley Bancorp, Inc. | Banking |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 10,523,000 |  |  |  |  |  |
Finite lived intangible assets, Amortization period |  |  |  |  | 10 years |  |  |  |  |  |
Independent Bank - Colorado Branches |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of branches acquired | Branch |  |  |  |  |  | 9 |  |  |  |  |
Goodwill |  |  |  |  |  | $ 5,817,000 |  |  |  |  |
Finite lived intangible assets, Amortization period |  |  |  |  |  | 10 years |  |  |  |  |
Business acquisition, related costs |  |  |  |  |  |  |  |  |  | $ 437,000 |
Date of acquisition completion date |  |  |  |  |  | Oct. 06, 2017 |  |  |  |  |
Aggregate deposit premium |  |  |  |  |  | $ 6,771,000 |  |  |  |  |
Aggregate deposit premium, percentage |  |  |  |  |  | 4.20% |  |  |  |  |

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