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Business Combinations and Divestitures - Summary of Acquired Loans (Details) - USD ($) $ in Thousands	Sep. 08, 2018	Dec. 09, 2017	Oct. 06, 2017
FBD
Business Acquisition [Line Items]
Total Loans Acquired	$ 256,384
FBD | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	251,376
FBD | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	5,008
SCC
Business Acquisition [Line Items]
Total Loans Acquired	31,454
SCC | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	31,254
SCC | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	200
Total
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	282,630
Total Loans Acquired	287,838
Total | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	282,630	$ 169,746
Total | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	5,208
Valley Bancorp, Inc.
Business Acquisition [Line Items]
Total Loans Acquired		171,199
Valley Bancorp, Inc. | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition		1,453
Independent Bank - Colorado Branches
Business Acquisition [Line Items]
Total Loans Acquired			$ 95,794
Commercial real estate | FBD | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	140,955
Commercial real estate | FBD | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	832
Commercial real estate | SCC | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	11,894
Commercial real estate | SCC | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	200
Commercial real estate | Total
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	152,849
Total Loans Acquired	153,881
Commercial real estate | Total | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans		73,273
Commercial real estate | Total | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	1,032
Commercial real estate | Valley Bancorp, Inc.
Business Acquisition [Line Items]
Total Loans Acquired		73,527
Commercial real estate | Valley Bancorp, Inc. | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition		254
Commercial real estate | Independent Bank - Colorado Branches
Business Acquisition [Line Items]
Total Loans Acquired			13,382
Construction, land development, land | FBD | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	13,949
Construction, land development, land | FBD | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	3,081
Construction, land development, land | SCC | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	5,229
Construction, land development, land | Total
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	19,178
Total Loans Acquired	22,259
Construction, land development, land | Total | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans		19,770
Construction, land development, land | Total | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	3,081
Construction, land development, land | Valley Bancorp, Inc.
Business Acquisition [Line Items]
Total Loans Acquired		20,969
Construction, land development, land | Valley Bancorp, Inc. | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition		1,199
Construction, land development, land | Independent Bank - Colorado Branches
Business Acquisition [Line Items]
Total Loans Acquired			537
1-4 family residential properties | FBD | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	59,228
1-4 family residential properties | FBD | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	75
1-4 family residential properties | SCC | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	10,180
1-4 family residential properties | Total
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	69,408
Total Loans Acquired	69,483
1-4 family residential properties | Total | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans		26,264
1-4 family residential properties | Total | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	75
1-4 family residential properties | Valley Bancorp, Inc.
Business Acquisition [Line Items]
Total Loans Acquired		26,264
1-4 family residential properties | Independent Bank - Colorado Branches
Business Acquisition [Line Items]
Total Loans Acquired			6,986
Farmland | FBD | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	5,709
Farmland | SCC | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	1,207
Farmland | Total
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	6,916
Total Loans Acquired	6,916
Farmland | Total | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans		16,934
Farmland | Valley Bancorp, Inc.
Business Acquisition [Line Items]
Total Loans Acquired		16,934
Farmland | Independent Bank - Colorado Branches
Business Acquisition [Line Items]
Total Loans Acquired			31,490
Commercial | FBD | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	26,125
Commercial | FBD | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	1,020
Commercial | SCC | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	2,121
Commercial | Total
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	28,246
Total Loans Acquired	29,266
Commercial | Total | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans		31,893
Commercial | Total | PCI Loans
Business Acquisition [Line Items]
Acquired loans at acquisition	1,020
Commercial | Valley Bancorp, Inc.
Business Acquisition [Line Items]
Total Loans Acquired		31,893
Commercial | Independent Bank - Colorado Branches
Business Acquisition [Line Items]
Total Loans Acquired			43,104
Consumer | FBD | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	5,410
Consumer | SCC | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	623
Consumer | Total
Business Acquisition [Line Items]
Loans, Excluding PCI Loans	6,033
Total Loans Acquired	$ 6,033
Consumer | Total | Non-Purchase Credit Impaired Loans
Business Acquisition [Line Items]
Loans, Excluding PCI Loans		1,612
Consumer | Valley Bancorp, Inc.
Business Acquisition [Line Items]
Total Loans Acquired		$ 1,612
Consumer | Independent Bank - Colorado Branches
Business Acquisition [Line Items]
Total Loans Acquired			$ 295

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