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Business Combinations and Divestitures - Additional Information (Details) |  |  |  |  |  |  |  | 12 Months Ended
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Jan. 19, 2018 | Dec. 09, 2017 USD ($) locations | Oct. 06, 2017 USD ($) Branch | Mar. 31, 2017 USD ($) | Sep. 01, 2016 USD ($) | Aug. 01, 2016 USD ($) | Mar. 03, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Recorded investment, without valuation allowance |  |  |  |  |  |  |  | $ 24,720,000 | $ 21,528,000 |
Loans |  |  |  |  |  |  |  | 2,810,856,000 | 2,027,624,000 |
Goodwill |  |  |  |  |  |  |  | 44,126,000 | 28,810,000 |
Business acquisition, related costs |  |  |  | $ 400,000 |  |  |  |  |  |
Origination fees |  |  |  |  |  |  |  | 2,944,000 | 2,772,000 |
PCI Loans |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  | 15,598,000 | 26,907,000 |
Valley Bank & Trust |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of locations | locations |  | 7 |  |  |  |  |  |  |  |
Valley Bancorp, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Date of acquisition completion date |  | Dec. 09, 2017 |  |  |  |  |  |  |  |
Goodwill |  | $ 10,523,000 |  |  |  |  |  |  |  |
Business acquisition, related costs |  |  |  |  |  |  |  | 1,251,000 |  |
Acquired loans at acquisition |  | 171,199,000 |  |  |  |  |  |  |  |
Intangible asset |  | 6,072,000 |  |  |  |  |  |  |  |
Total consideration transferred |  | 40,075,000 |  |  |  |  |  |  |  |
Valley Bancorp, Inc. | PCI Loans |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired loans at acquisition |  | 1,453,000 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
Date of acquisition completion date |  |  | Oct. 06, 2017 |  |  |  |  |  |  |
Goodwill |  |  | $ 5,817,000 |  |  |  |  |  |  |
Finite lived intangible assets, Amortization period |  |  | 10 years |  |  |  |  |  |  |
Business acquisition, related costs |  |  |  |  |  |  |  | 437,000 |  |
Number of branches acquired | Branch |  |  | 9 |  |  |  |  |  |  |
Aggregate deposit premium |  |  | $ 6,771,000 |  |  |  |  |  |  |
Aggregate deposit premium, percentage |  |  | 4.20% |  |  |  |  |  |  |
Acquired loans at acquisition |  |  | $ 95,794,000 |  |  |  |  |  |  |
Intangible asset |  |  | 3,255,000 |  |  |  |  |  |  |
Independent Bank - Colorado Branches | PCI Loans |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired loans at acquisition |  |  | $ 0 |  |  |  |  |  |  |
Southern Transportation Insurance Agency, Ltd. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  | $ 2,150,000 |  |  |  |  |
Southern Transportation Insurance Agency, Ltd. | Banking |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 570,000 |  |  |  |  |
Finite lived intangible assets, Amortization period |  |  |  |  | 8 years |  |  |  |  |
Intangible asset |  |  |  |  | $ 1,580,000 |  |  |  |  |
ColoEast Bankshares, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 12,272,000 |
Business acquisition, related costs |  |  |  |  |  |  |  |  | 1,618,000 |
Acquired loans at acquisition |  |  |  |  |  | $ 460,775,000 |  |  |  |
Cash paid for business acquisition |  |  |  |  |  | $ 70,000,000 |  |  | 70,000,000 |
Intangible asset |  |  |  |  |  |  |  |  | $ 7,238,000 |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  | 100.00% |  |  |  |
TARP Preferred stock, redemption date |  |  |  |  |  |  |  |  | Aug. 31, 2016 |
Total consideration transferred |  |  |  |  |  |  |  |  | $ 80,500,000 |
ColoEast Bankshares, Inc. | Preferred Stock |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock issued |  |  |  |  |  | $ 10,500,000 |  |  | 10,500,000 |
ColoEast Bankshares, Inc. | PCI Loans |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired loans at acquisition |  |  |  |  |  | 19,293,000 |  |  |  |
ColoEast Bankshares, Inc. | Banking |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 12,272,000 |  |  |  |
Finite lived intangible assets, Amortization period |  |  |  |  |  | 10 years |  |  |  |
Doral Money Acquisition |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, related costs |  |  |  |  |  |  |  |  |  | $ 243,000
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  | 100.00% |  |  |
CLO management contract acquired - Assets under management |  |  |  |  |  |  | $ 700,000,000 |  |  |
Total consideration transferred |  |  |  |  |  |  | $ 135,864,000 |  |  | $ 135,864,000
Substandard |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  | 59,679,000 | $ 56,116,000 |
Triumph Healthcare Finance | Loans Held for Sale |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Recorded investment, without valuation allowance |  |  |  |  |  |  |  | 245,000 |  |
Triumph Healthcare Finance | Substandard | Loans Held for Sale |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  | 5,431,000 |  |
Triumph Healthcare Finance | Subsequent Event |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal of group agreement date | Jan. 19, 2018 |  |  |  |  |  |  |  |  |
Triumph Capital Advisors, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 1,623,000 |  |  |  | $ 1,737,000 |  |
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 |  |  |  |  |  |
Origination fees |  |  |  | $ 25,000 |  |  |  |  |  |
Triumph Capital Advisors, LLC | Interest Rate Floor | Loans Receivable |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Term credit facility, interest rate |  |  |  | 5.50% |  |  |  |  |  |

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