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Business Combinations and Divestitures - Additional Information (Details) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 23, 2017 USD ($) Branch | Mar. 31, 2017 USD ($) | Sep. 01, 2016 USD ($) | Aug. 01, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Origination fees |  |  |  |  |  | $ 3,164,000 | $ 2,772,000
Business acquisition, related costs |  | $ 400,000 |  |  |  |  |
Goodwill |  |  |  |  |  | $ 28,810,000 | 28,810,000
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 |  |  |  |  |
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% |  |  |  |  |
Independent Bank Colorado Branches | TBK Bank SSB |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches acquired | Branch | 9 |  |  |  |  |  |
Date of acquisition agreement date |  |  |  |  |  | Jun. 23, 2017 |
Business combination loans acquired | $ 100,000,000 |  |  |  |  |  |
Business combination deposits assumed | 168,000,000 |  |  |  |  |  |
Estimated aggregate deposit premium | $ 7,000,000 |  |  |  |  |  |
Estimated aggregate deposit premium, percentage | 4.17% |  |  |  |  |  |
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] |  |  |  |  |  |  |
Intangible asset |  |  | 1,580,000 |  |  |  |
Goodwill |  |  | $ 570,000 |  |  |  |
ColoEast Bankshares, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination deposits assumed |  |  |  |  |  |  | 652,952,000
Business acquisition, related costs |  |  |  |  | $ 1,618,000 |  |
Cash paid for business acquisition |  |  |  | $ 70,000,000 |  |  | 70,000,000
Intangible asset |  |  |  |  |  |  | 7,238,000
Goodwill |  |  |  |  |  |  | 12,272,000
Business acquisition, percentage of voting interests acquired |  |  |  | 100.00% |  |  |
TARP Preferred stock, redemption date |  |  |  |  |  | Aug. 31, 2016 |
ColoEast Bankshares, Inc. | Preferred Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Preferred stock issued |  |  |  | $ 10,500,000 |  |  | $ 10,500,000
ColoEast Bankshares, Inc. | Banking |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  | $ 12,272,000 |  |  |

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