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Related Party Transactions (Details) - USD ($)	3 Months Ended
Related Party Transactions (Details) - USD ($)	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Mar. 16, 2017	Mar. 16, 2012
Related Party Transaction [Line Items]
Securities purchased under agreements to resell	$ 245,416,000		$ 178,914,000
Securities sold under agreements to repurchase	409,784,000		173,028,000
Preferred stock	229,475,000		229,475,000
Preferred stock dividends	4,155,000	$ 4,485,000
Transfer of loans to loans held for sale	0	1,196,883,000
BBVA
Related Party Transaction [Line Items]
Securities purchased under agreements to resell	138,265,000		178,914,000
Securities sold under agreements to repurchase	53,574,000		16,596,000
BBVA \| BBVA Compass Bancshares, Inc.
Related Party Transaction [Line Items]
Revenue from related parties	4,100,000	4,100,000
Fees on agreements	9,900,000	8,500,000
Derivatives designated as hedging instrument \| BBVA
Related Party Transaction [Line Items]
Derivative, notional amount	3,500,000,000		3,400,000,000
Free-standing derivatives not designated as hedging instrument \| Free-standing derivative instruments – risk management and other purposes \| BBVA
Related Party Transaction [Line Items]
Related party transaction, amount of transaction	(60,621,000)		(9,688,000)
Preferred Stock \| Series A Preferred Stock \| BBVA
Related Party Transaction [Line Items]
Preferred stock	229,000,000		229,000,000
Preferred stock dividends	4,200,000	4,500,000
Cash flow hedges \| Derivatives designated as hedging instrument \| BBVA
Related Party Transaction [Line Items]
Related party transaction, amount of transaction	(574,000)		102,000
Fair value hedges \| BBVA
Related Party Transaction [Line Items]
Related party transaction, amount of transaction	(799,000)		(354,000)
BSI \| Revolving Credit Facility \| Line of Credit \| BBVA Compass Bancshares, Inc.
Related Party Transaction [Line Items]
Due from related parties	0		$ 0	$ 450,000,000	$ 420,000,000
BSI \| Uncommitted Demand Facility \| Revolving Credit Facility \| Line of Credit \| BBVA Compass Bancshares, Inc.
Related Party Transaction [Line Items]
Due from related parties				$ 1,000,000,000
BSI \| Revolving Note and Cash Subordinated Agreement \| BBVA Compass Bancshares, Inc.
Related Party Transaction [Line Items]
Interest expense	55,000	25,000
Loans and Loans Held for Sale Excluding Loans Originated for Sale in Secondary Market
Related Party Transaction [Line Items]
Transfer of loans to loans held for sale	$ 0	1,196,883,000
Gain on sale of loans		$ 778,000