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Business Combinations and Divestitures - Summary of Acquired Loans (Details) - USD ($)	Dec. 09, 2017	Oct. 06, 2017	Aug. 01, 2016
Valley Bancorp, Inc.
Business Acquisition [Line Items]
Acquired loans at acquisition	$ 171,199,000
Valley Bancorp, Inc. | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	169,746,000
Valley Bancorp, Inc. | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	1,453,000
Valley Bancorp, Inc. | Construction, land development, land
Business Acquisition [Line Items]
Acquired loans at acquisition	20,969,000
Valley Bancorp, Inc. | Construction, land development, land | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	19,770,000
Valley Bancorp, Inc. | Construction, land development, land | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	1,199,000
Valley Bancorp, Inc. | 1-4 family residential properties
Business Acquisition [Line Items]
Acquired loans at acquisition	26,264,000
Valley Bancorp, Inc. | 1-4 family residential properties | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	26,264,000
Valley Bancorp, Inc. | Farmland
Business Acquisition [Line Items]
Acquired loans at acquisition	16,934,000
Valley Bancorp, Inc. | Farmland | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	16,934,000
Valley Bancorp, Inc. | Commercial
Business Acquisition [Line Items]
Acquired loans at acquisition	31,893,000
Valley Bancorp, Inc. | Commercial | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	31,893,000
Valley Bancorp, Inc. | Consumer
Business Acquisition [Line Items]
Acquired loans at acquisition	1,612,000
Valley Bancorp, Inc. | Consumer | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	1,612,000
Valley Bancorp, Inc. | Commercial real estate
Business Acquisition [Line Items]
Acquired loans at acquisition	73,527,000
Valley Bancorp, Inc. | Commercial real estate | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	73,273,000
Valley Bancorp, Inc. | Commercial real estate | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	$ 254,000
Independent Bank - Colorado Branches
Business Acquisition [Line Items]
Acquired loans at acquisition		$ 95,794,000
Independent Bank - Colorado Branches | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition		95,794,000
Independent Bank - Colorado Branches | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition		0
Independent Bank - Colorado Branches | Construction, land development, land
Business Acquisition [Line Items]
Acquired loans at acquisition		537,000
Independent Bank - Colorado Branches | 1-4 family residential properties
Business Acquisition [Line Items]
Acquired loans at acquisition		6,986,000
Independent Bank - Colorado Branches | Farmland
Business Acquisition [Line Items]
Acquired loans at acquisition		31,490,000
Independent Bank - Colorado Branches | Commercial
Business Acquisition [Line Items]
Acquired loans at acquisition		43,104,000
Independent Bank - Colorado Branches | Consumer
Business Acquisition [Line Items]
Acquired loans at acquisition		295,000
Independent Bank - Colorado Branches | Commercial real estate
Business Acquisition [Line Items]
Acquired loans at acquisition		$ 13,382,000
ColoEast Bankshares, Inc.
Business Acquisition [Line Items]
Acquired loans at acquisition			$ 460,775,000
ColoEast Bankshares, Inc. | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			441,482,000
ColoEast Bankshares, Inc. | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			19,293,000
ColoEast Bankshares, Inc. | Construction, land development, land
Business Acquisition [Line Items]
Acquired loans at acquisition			61,651,000
ColoEast Bankshares, Inc. | Construction, land development, land | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			58,718,000
ColoEast Bankshares, Inc. | Construction, land development, land | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			2,933,000
ColoEast Bankshares, Inc. | 1-4 family residential properties
Business Acquisition [Line Items]
Acquired loans at acquisition			36,503,000
ColoEast Bankshares, Inc. | 1-4 family residential properties | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			36,412,000
ColoEast Bankshares, Inc. | 1-4 family residential properties | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			91,000
ColoEast Bankshares, Inc. | Farmland
Business Acquisition [Line Items]
Acquired loans at acquisition			101,210,000
ColoEast Bankshares, Inc. | Farmland | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			100,977,000
ColoEast Bankshares, Inc. | Farmland | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			233,000
ColoEast Bankshares, Inc. | Factored receivables
Business Acquisition [Line Items]
Acquired loans at acquisition			694,000
ColoEast Bankshares, Inc. | Factored receivables | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			694,000
ColoEast Bankshares, Inc. | Consumer
Business Acquisition [Line Items]
Acquired loans at acquisition			6,507,000
ColoEast Bankshares, Inc. | Consumer | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			6,507,000
ColoEast Bankshares, Inc. | Commercial real estate
Business Acquisition [Line Items]
Acquired loans at acquisition			97,476,000
ColoEast Bankshares, Inc. | Commercial real estate | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			86,569,000
ColoEast Bankshares, Inc. | Commercial real estate | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			10,907,000
ColoEast Bankshares, Inc. | Commercial
Business Acquisition [Line Items]
Acquired loans at acquisition			156,734,000
ColoEast Bankshares, Inc. | Commercial | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			151,605,000
ColoEast Bankshares, Inc. | Commercial | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition			$ 5,129,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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