Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jul. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Accrued expenses and other liabilities	$ 203,962		$ 243,207
Heritage Oaks Bank | Subordinated debt
Variable Interest Entity [Line Items]
Redeemed amount of debt instrument		$ 5,200
Santa Lucia Bancorp (CA) Capital Trust | Subordinated debt
Variable Interest Entity [Line Items]
Redeemed amount of debt instrument		$ 5,200
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum Loss	$ 200,769		223,509
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization, Liability
Variable Interest Entity [Line Items]
Maximum loss, percentage of loans	10.00%
Maximum Loss	$ 50,901		50,901
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization
Variable Interest Entity [Line Items]
Accrued expenses and other liabilities	$ 338		$ 448