v3.20.4

Benefit Plans - Change in benefit obligations and plan assets (Details) - Defined Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in benefit obligation:
Benefit obligation, at beginning of year	$ 379,026	$ 334,290
Service cost	600	550	$ 509
Interest cost	10,497	12,862	11,565
Actuarial (gain) loss	36,477	46,375
Benefits paid	(16,261)	(15,051)
Benefit obligation, at end of year	410,339	379,026	334,290
Change in plan assets:
Fair value of plan assets, at beginning of year	361,920	328,795
Actual return on plan assets	54,958	45,176
Employer contribution	0	3,000
Benefits paid	(16,261)	(15,051)
Fair value of plan assets, at end of year	400,617	361,920	$ 328,795
Funded status	(9,722)	(17,106)
Net actuarial loss	33,570	43,125
Net amount recognized	$ 23,848	$ 26,019

Defined Benefit Plan, Net Actuarial Gain Loss

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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BBVA USA Bancshares, Inc. 10-K