Subordinated Debentures - Narrative (Details)			1 Months Ended		3 Months Ended		12 Months Ended
	Jul. 07, 2021 USD ($)	Apr. 15, 2021 USD ($)	Jun. 30, 2020 USD ($)	May 31, 2019 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Aug. 15, 2021 USD ($)	Jul. 31, 2021 USD ($)	Jul. 01, 2021 USD ($)	Aug. 31, 2014 USD ($)
Debt Instrument [Line Items]
Subordinated debentures							$ 331,204,000	$ 330,567,000
Weighted average interest rate at year-end							5.32%	5.33%
Increase to carrying value of subordinated debt							$ 637,000
Gain (loss) on debt extinguishment							$ 0	$ (180,000)	$ 0
Subordinated notes
Debt Instrument [Line Items]
Number of subordinated debt instruments | loan							3
Subordinated debentures							$ 331,204,000	330,567,000
Face amount of debt instrument						$ 25,000,000	335,000,000
Redemption price (as a percent)		103.00%
Gain (loss) on debt extinguishment		$ (647,000)
Purchase accounting adjustments		$ 103,000
Reduction in Tier 2 capital					$ 146,000,000	$ 20,000,000
Redeemed amount of debt instrument					$ 145,400,000
Subordinated notes | Opus
Debt Instrument [Line Items]
Face amount of debt instrument												$ 135,000,000
Fixed interest rate (as a percent)												5.50%
Subordinated notes | Subordinated notes due 2024, 5.75% per annum
Debt Instrument [Line Items]
Subordinated debentures							59,791,000	59,671,000
Face amount of debt instrument							$ 60,000,000						$ 60,000,000
Fixed interest rate (as a percent)							5.75%						5.75%
Unamortized debt issuance costs							$ 209,000
Effective rate (as a percent)							5.75%
Subordinated notes | Subordinated notes due 2029, 4.875% per annum until May 15, 2024, 3-month LIBOR +4.9% thereafter
Debt Instrument [Line Items]
Subordinated debentures							$ 123,386,000	123,132,000
Face amount of debt instrument				$ 125,000,000			$ 125,000,000
Fixed interest rate (as a percent)				4.875%			4.875%
Unamortized debt issuance costs							$ 1,600,000
Public offering price				100.00%
Effective rate (as a percent)							4.875%
Subordinated notes | Subordinated notes due 2029, 4.875% per annum until May 15, 2024, 3-month LIBOR +4.9% thereafter | LIBOR
Debt Instrument [Line Items]
Floating interest rate, basis points added to base rate (as a percent)				2.50%			4.90%
Subordinated notes | Subordinated notes due 2030, 5.375% per annum until June 15, 2025, 3-month SOFR +5.17% thereafter
Debt Instrument [Line Items]
Subordinated debentures							$ 148,027,000	$ 147,764,000
Face amount of debt instrument			$ 150,000,000				$ 150,000,000
Fixed interest rate (as a percent)							5.375%
Unamortized debt issuance costs							$ 2,000,000
Effective rate (as a percent)							5.375%
Offering price, percentage of aggregate principal amount			100.00%
Subordinated notes | Subordinated notes due 2030, 5.375% per annum until June 15, 2025, 3-month SOFR +5.17% thereafter | SOFR
Debt Instrument [Line Items]
Floating interest rate, basis points added to base rate (as a percent)			5.17%				0.0517%
Subordinated notes | Subordinated Notes 7.125%, Due 2025
Debt Instrument [Line Items]
Fixed interest rate (as a percent)							7.125%
Junior Subordinated Debt | Heritage Oaks Bank
Debt Instrument [Line Items]
Face amount of debt instrument												$ 5,200,000
Fixed interest rate (as a percent)												1.92%
Redeemed amount of debt instrument											$ 5,200,000
Junior Subordinated Debt | Santa Lucia Bancorp (CA) Capital Trust
Debt Instrument [Line Items]
Face amount of debt instrument	$ 5,200,000
Fixed interest rate (as a percent)	1.66%
Redeemed amount of debt instrument											$ 5,200,000
Junior Subordinated Debt | Subordinated notes due 2024, 5.75% per annum
Debt Instrument [Line Items]
Percentage of Notes I qualified as Tier 2 Capital as remaining maturity is less than four years							20.00%
Subordinated and Junior Subordinated Debt
Debt Instrument [Line Items]
Redemption amount	$ 149,200,000									$ 25,800,000
Gain (loss) on debt extinguishment	$ 970,000