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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
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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