Subordinated Debentures - Schedule of outstanding subordinated debentures (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) note
Debt Instrument [Line Items]
Subordinated debentures	$ 215,269	$ 215,145
Weighted interest rate	5.43%	5.37%
Carrying Value	$ 215,269	$ 215,145
Current Principal Balance	220,403
Subordinated notes
Debt Instrument [Line Items]
Number of notes/securities \| note		3
Subordinated debentures	207,275	$ 207,187
Carrying Value	207,275	207,187
Current Principal Balance	210,000
Subordinated notes \| Subordinated notes due 2024, 5.75% per annum
Debt Instrument [Line Items]
Subordinated debentures	59,462	59,432
Carrying Value	$ 59,462	59,432
Current Interest Rate	5.75%
Current Principal Balance	$ 60,000
Subordinated notes \| Subordinated notes due 2029, 4.875% per annum until May 15, 2024, 3-month LIBOR 2.5% thereafter
Debt Instrument [Line Items]
Subordinated debentures	122,686	122,622
Carrying Value	$ 122,686	122,622
Current Interest Rate	4.875%
Current Principal Balance	$ 125,000
Subordinated notes \| Subordinated notes due 2029, 4.875% per annum until May 15, 2024, 3-month LIBOR 2.5% thereafter \| LIBOR
Debt Instrument [Line Items]
Variable rate	2.50%
Subordinated notes \| Subordinated notes due 2025, 7.125% per annum
Debt Instrument [Line Items]
Subordinated debentures	$ 25,127	25,133
Carrying Value	$ 25,127	$ 25,133
Current Interest Rate	7.125%
Current Principal Balance	$ 25,000
Subordinated debt
Debt Instrument [Line Items]
Number of notes/securities \| note		2
Subordinated debentures	7,994	$ 7,958
Carrying Value	7,994	7,958
Current Principal Balance	10,403
Subordinated debt \| Heritage Oaks Bancorp
Debt Instrument [Line Items]
Subordinated debentures	4,071	4,054
Carrying Value	$ 4,071	4,054
Current Interest Rate	3.63%
Variable rate	1.72%
Current Principal Balance	$ 5,248
Subordinated debt \| Santa Lucia Bancorp (CA) Capital Trust
Debt Instrument [Line Items]
Subordinated debentures	3,923	3,904
Carrying Value	$ 3,923	$ 3,904
Current Interest Rate	3.31%
Current Principal Balance	$ 5,155
Subordinated debt \| Santa Lucia Bancorp (CA) Capital Trust \| LIBOR
Debt Instrument [Line Items]
Variable rate	1.48%

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Weighted average interest rate of debt outstanding.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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