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Business Combinations and Divestitures - Additional Information (Details)								3 Months Ended			9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 08, 2018 USD ($) Branch	Jun. 02, 2018 USD ($)	Jan. 19, 2018	Dec. 09, 2017 USD ($) locations	Oct. 06, 2017 USD ($) Branch	Mar. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 158,728,000							$ 158,728,000		$ 44,126,000	$ 158,728,000
Valley Bank & Trust
Business Acquisition [Line Items]
Number of locations | locations					7
Triumph Healthcare Finance
Business Acquisition [Line Items]
Disposal of group agreement date				Jan. 19, 2018
Disposal of group closing date				Mar. 16, 2018
Triumph Capital Advisors, LLC
Business Acquisition [Line Items]
Business acquisition, related costs							$ 400,000
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	1,725,000						1,623,000	1,725,000			1,725,000
Cash proceeds from the revenue share											$ 174,000
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
Triumph Capital Advisors, LLC | Interest Rate Floor | Loans Receivable
Business Acquisition [Line Items]
Term credit facility, interest rate							5.50%
First National Bank of Durango | Durango, Colorado
Business Acquisition [Line Items]
Number of branches acquired | Branch		4
First National Bank of Durango | Bayfield, Colorado
Business Acquisition [Line Items]
Number of branches acquired | Branch		1
Bank of New Mexico | Albuquerque, Gallup and Grants, New Mexico
Business Acquisition [Line Items]
Number of branches acquired | Branch		3
Citizens Bank of Pagosa Springs | Pagosa Springs, Colorado
Business Acquisition [Line Items]
Number of branches acquired | Branch		2
First Bancorp of Durango, Inc. And Southern Colorado Corp.
Business Acquisition [Line Items]
Goodwill		$ 72,060,000
Finite lived intangible assets, Amortization period		10 years
Business acquisition, related costs								$ 5,871,000,000
Interstate Capital Corporation
Business Acquisition [Line Items]
Goodwill			$ 42,975,000
Business acquisition, related costs									$ 1,094,000
Date of acquisition completion date			Jun. 02, 2018
Fair value of consideration paid included contingent consideration			$ 20,000,000
Interstate Capital Corporation | Factoring
Business Acquisition [Line Items]
Goodwill			42,975,000
Fair value of consideration paid included contingent consideration	$ 20,487,000		20,000,000
Interstate Capital Corporation | Factoring | Minimum
Business Acquisition [Line Items]
Fair value of consideration paid included contingent consideration			0
Interstate Capital Corporation | Factoring | Maximum
Business Acquisition [Line Items]
Fair value of consideration paid included contingent consideration			$ 22,000,000
Interstate Capital Corporation | Factoring | Customer Relationship
Business Acquisition [Line Items]
Finite lived intangible assets, Amortization period			8 years
Finite-lived intangible assets, fair value			$ 13,500,000
Interstate Capital Corporation | Factoring | Trade Name
Business Acquisition [Line Items]
Finite lived intangible assets, Amortization period			3 years
Finite-lived intangible assets, fair value			$ 420,000
Valley Bancorp, Inc.
Business Acquisition [Line Items]
Goodwill					$ 10,523,000
Business acquisition, related costs										1,251,000
Date of acquisition completion date					Dec. 09, 2017
Valley Bancorp, Inc. | Banking
Business Acquisition [Line Items]
Goodwill					$ 10,523,000
Finite lived intangible assets, Amortization period					10 years
Independent Bank - Colorado Branches
Business Acquisition [Line Items]
Number of branches acquired | Branch						9
Goodwill						$ 5,817,000
Finite lived intangible assets, Amortization period						10 years
Business acquisition, related costs										$ 437,000
Date of acquisition completion date						Oct. 06, 2017
Aggregate deposit premium						$ 6,771,000
Aggregate deposit premium, percentage						4.20%

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