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Business Combinations and Divestitures - Summary of Acquired Loans (Details) - USD ($) | Sep. 08, 2018 | Dec. 09, 2017 | Oct. 06, 2017 | Dec. 31, 2016 | Aug. 01, 2016
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FBD |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired | $ 256,384,000 |  |  |  |
FBD | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 251,376,000 |  |  |  |
FBD | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 5,008,000 |  |  |  |
SCC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired | 31,454,000 |  |  |  |
SCC | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 31,254,000 |  |  |  |
SCC | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 200,000 |  |  |  |
Total |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 282,630,000 |  |  |  |
Total Loans Acquired | 287,838,000 |  |  |  |
Total | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 282,630,000 |  |  |  |
Total | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 5,208,000 |  |  |  |
Valley Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  | $ 171,199,000 |  |  |
Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  | 169,746,000 |  |  |
Valley Bancorp, Inc. | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  | 1,453,000 |  |  |
Independent Bank - Colorado Branches |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  | $ 95,794,000 |  |
Independent Bank - Colorado Branches | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  |  | 95,794,000 |  |
Independent Bank - Colorado Branches | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  |  | 0 |  |
ColoEast Bankshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  |  | $ 460,775,000 | $ 460,775,000
ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  |  |  |  | 441,482,000
ColoEast Bankshares, Inc. | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  |  |  |  | 19,293,000
Construction, land development, land | FBD | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 13,949,000 |  |  |  |
Construction, land development, land | FBD | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 3,081,000 |  |  |  |
Construction, land development, land | SCC | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 5,229,000 |  |  |  |
Construction, land development, land | Total |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 19,178,000 |  |  |  |
Total Loans Acquired | 22,259,000 |  |  |  |
Construction, land development, land | Total | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 3,081,000 |  |  |  |
Construction, land development, land | Valley Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  | 20,969,000 |  |  |
Construction, land development, land | Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  | 19,770,000 |  |  |
Construction, land development, land | Valley Bancorp, Inc. | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  | 1,199,000 |  |  |
Construction, land development, land | Independent Bank - Colorado Branches |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  | 537,000 |  |
Construction, land development, land | ColoEast Bankshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  |  |  | 61,651,000
Construction, land development, land | ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  |  |  |  | 58,718,000
Construction, land development, land | ColoEast Bankshares, Inc. | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  |  |  |  | 2,933,000
1-4 family residential properties | FBD | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 59,228,000 |  |  |  |
1-4 family residential properties | FBD | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 75,000 |  |  |  |
1-4 family residential properties | SCC | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 10,180,000 |  |  |  |
1-4 family residential properties | Total |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 69,408,000 |  |  |  |
Total Loans Acquired | 69,483,000 |  |  |  |
1-4 family residential properties | Total | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 75,000 |  |  |  |
1-4 family residential properties | Valley Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  | 26,264,000 |  |  |
1-4 family residential properties | Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  | 26,264,000 |  |  |
1-4 family residential properties | Independent Bank - Colorado Branches |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  | 6,986,000 |  |
1-4 family residential properties | ColoEast Bankshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  |  |  | 36,503,000
1-4 family residential properties | ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  |  |  |  | 36,412,000
1-4 family residential properties | ColoEast Bankshares, Inc. | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  |  |  |  | 91,000
Farmland | FBD | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 5,709,000 |  |  |  |
Farmland | SCC | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 1,207,000 |  |  |  |
Farmland | Total |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 6,916,000 |  |  |  |
Total Loans Acquired | 6,916,000 |  |  |  |
Farmland | Valley Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  | 16,934,000 |  |  |
Farmland | Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  | 16,934,000 |  |  |
Farmland | Independent Bank - Colorado Branches |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  | 31,490,000 |  |
Farmland | ColoEast Bankshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  |  |  | 101,210,000
Farmland | ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  |  |  |  | 100,977,000
Farmland | ColoEast Bankshares, Inc. | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  |  |  |  | 233,000
Commercial | FBD | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 26,125,000 |  |  |  |
Commercial | FBD | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 1,020,000 |  |  |  |
Commercial | SCC | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 2,121,000 |  |  |  |
Commercial | Total |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 28,246,000 |  |  |  |
Total Loans Acquired | 29,266,000 |  |  |  |
Commercial | Total | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 1,020,000 |  |  |  |
Commercial | Valley Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  | 31,893,000 |  |  |
Commercial | Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  | 31,893,000 |  |  |
Commercial | Independent Bank - Colorado Branches |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  | 43,104,000 |  |
Commercial | ColoEast Bankshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  |  |  | 156,734,000
Commercial | ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  |  |  |  | 151,605,000
Commercial | ColoEast Bankshares, Inc. | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  |  |  |  | 5,129,000
Factored receivables | ColoEast Bankshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  |  |  | 694,000
Factored receivables | ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  |  |  |  | 694,000
Consumer | FBD | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 5,410,000 |  |  |  |
Consumer | SCC | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 623,000 |  |  |  |
Consumer | Total |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 6,033,000 |  |  |  |
Total Loans Acquired | 6,033,000 |  |  |  |
Consumer | Valley Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  | 1,612,000 |  |  |
Consumer | Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  | 1,612,000 |  |  |
Consumer | Independent Bank - Colorado Branches |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  | 295,000 |  |
Consumer | ColoEast Bankshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  |  |  | 6,507,000
Consumer | ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  |  |  |  | 6,507,000
Commercial real estate | FBD | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 140,955,000 |  |  |  |
Commercial real estate | FBD | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 832,000 |  |  |  |
Commercial real estate | SCC | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 11,894,000 |  |  |  |
Commercial real estate | SCC | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | 200,000 |  |  |  |
Commercial real estate | Total |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans | 152,849,000 |  |  |  |
Total Loans Acquired | 153,881,000 |  |  |  |
Commercial real estate | Total | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition | $ 1,032,000 |  |  |  |
Commercial real estate | Valley Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  | 73,527,000 |  |  |
Commercial real estate | Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  | 73,273,000 |  |  |
Commercial real estate | Valley Bancorp, Inc. | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  | $ 254,000 |  |  |
Commercial real estate | Independent Bank - Colorado Branches |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  | $ 13,382,000 |  |
Commercial real estate | ColoEast Bankshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total Loans Acquired |  |  |  |  | 97,476,000
Commercial real estate | ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, Excluding PCI Loans |  |  |  |  | 86,569,000
Commercial real estate | ColoEast Bankshares, Inc. | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired loans at acquisition |  |  |  |  | $ 10,907,000

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