Basis of Presentation, Description of Business and Summary of Significant Accounting Policies - Narrative (Details)		12 Months Ended
	May 11, 2021 shares	Dec. 31, 2021 USD ($) branch	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) non-competition_agreement	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill impairment loss		$ 0	$ 0	$ 0
Number of non-competition agreements put in place | non-competition_agreement				2
Number of bank branches closure | branch		6
Impairment of long-lived assets		$ 0	678,000	$ 0
Defined contribution plan, maximum annual contributions per employee, percent		100.00%
Defined contribution plan, employer matching contribution, percent of employees' elective deferrals		100.00%
Defined contribution plan, employer matching contribution, percent of match		6.00%
Employer discretionary contribution amount		$ 4,912,000	$ 4,351,000	$ 3,390,000
Forecast
Business Acquisition [Line Items]
Operating lease, right-of-use asset					$ 30,000,000
Operating lease liability					$ 35,000,000
Core Deposits Intangibles
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life		10 years
Customer Relationships Acquired Related To Wealth Management
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life		16 years
Customer Relationships Acquired Related To Wealth Advisory Services
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life			10 years
Minimum
Business Acquisition [Line Items]
Mortgage Servicing Rights, base servicing fee as percentage of remaining outstanding principle balances of loans		0.25%
Promises and equipment, useful lives		3 years
Maximum
Business Acquisition [Line Items]
Mortgage Servicing Rights, base servicing fee as percentage of remaining outstanding principle balances of loans		0.50%
Promises and equipment, useful lives		39 years
FirstSun Capital Bancorp and Pioneer Bancshares, Inc. Merger
Business Acquisition [Line Items]
Shares issuable in merger (in shares) | shares	1.0443
Business combination, assets of acquiree		$ 1,600,000,000
Business combination, loans of acquiree		900,000,000
Business combination, deposits of acquiree		$ 1,200,000,000