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Subordinated Debentures - Summary (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Apr. 15, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Face amount of debt instrument $ 335,000,000      
Carrying Value 330,408,000     $ 501,511,000
Subordinated notes        
Debt Instrument [Line Items]        
Fixed interest rate (as a percent)     7.125%  
Face amount of debt instrument 335,000,000 $ 25,000,000 $ 25,000,000  
Carrying Value $ 330,408,000     493,410,000
Subordinated notes | Subordinated notes due 2024, 5.75% per annum        
Debt Instrument [Line Items]        
Fixed interest rate (as a percent) 5.75%      
Current Interest Rate (as a percent) 5.75%      
Face amount of debt instrument $ 60,000,000      
Carrying Value $ 59,641,000     59,552,000
Subordinated notes | Subordinated notes due 2029, 4.875% per annum until May 15, 2024, 3-month LIBOR +2.5% thereafter        
Debt Instrument [Line Items]        
Fixed interest rate (as a percent) 4.875%      
Current Interest Rate (as a percent) 4.875%      
Face amount of debt instrument $ 125,000,000      
Carrying Value $ 123,068,000     122,877,000
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 (as a percent) 2.50%      
Subordinated notes | Subordinated notes due 2030, 5.375% per annum until June 15, 2025, 3-month SOFR +5.170% thereafter        
Debt Instrument [Line Items]        
Fixed interest rate (as a percent) 5.375%      
Current Interest Rate (as a percent) 5.375%      
Face amount of debt instrument $ 150,000,000      
Carrying Value $ 147,699,000     147,501,000
Subordinated notes | Subordinated notes due 2030, 5.375% per annum until June 15, 2025, 3-month SOFR +5.170% thereafter | SOFR        
Debt Instrument [Line Items]        
Variable rate (as a percent) 5.17%      
Subordinated notes | Subordinated notes due 2025, 7.125% per annum        
Debt Instrument [Line Items]        
Fixed interest rate (as a percent) 7.125%      
Current Interest Rate (as a percent) 0.00%      
Face amount of debt instrument $ 0      
Carrying Value $ 0     25,109,000
Subordinated notes | Subordinated notes due 2026, 5.50% per annum until June 30 2021, 3-month LIBOR +4.285% thereafter        
Debt Instrument [Line Items]        
Fixed interest rate (as a percent) 5.50%      
Current Interest Rate (as a percent) 0.00%      
Face amount of debt instrument $ 0      
Carrying Value $ 0     138,371,000
Subordinated notes | Subordinated notes due 2026, 5.50% per annum until June 30 2021, 3-month LIBOR +4.285% thereafter | LIBOR        
Debt Instrument [Line Items]        
Variable rate (as a percent) 4.285%      
Subordinated debt        
Debt Instrument [Line Items]        
Face amount of debt instrument $ 0      
Carrying Value $ 0     8,101,000
Subordinated debt | Heritage Oaks Bancorp        
Debt Instrument [Line Items]        
Current Interest Rate (as a percent) 0.00%      
Face amount of debt instrument $ 0      
Carrying Value $ 0     4,121,000
Subordinated debt | Heritage Oaks Bancorp | LIBOR        
Debt Instrument [Line Items]        
Variable rate (as a percent) 1.72%      
Subordinated debt | Santa Lucia Bancorp (CA) Capital Trust        
Debt Instrument [Line Items]        
Current Interest Rate (as a percent) 0.00%      
Face amount of debt instrument $ 0      
Carrying Value $ 0     $ 3,980,000
Subordinated debt | Santa Lucia Bancorp (CA) Capital Trust | LIBOR        
Debt Instrument [Line Items]        
Variable rate (as a percent) 1.48%