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Loans - Summary of Nonaccrual Loans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Nonaccrual [Line Items]          
ACL $ 268,018,000   $ 35,698,000 $ 36,072,000 $ 28,936,000
Nonaccrual loans 29,209,000   8,500,000    
Nonaccrual Loans with No ACL 27,968,000        
Interest income on nonaccrual loans 0        
Investor loans secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL   $ 9,027,000      
Nonaccrual loans 4,049,000        
Nonaccrual Loans with No ACL 4,049,000        
Investor loans secured by real estate | CRE non-owner-occupied          
Financing Receivable, Nonaccrual [Line Items]          
ACL 49,176,000   1,899,000 1,624,000 1,273,000
Nonaccrual loans 2,792,000        
Nonaccrual Loans with No ACL 2,792,000        
Investor loans secured by real estate | SBA secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 5,159,000   1,915,000 1,827,000 1,396,000
Nonaccrual loans 1,257,000        
Nonaccrual Loans with No ACL 1,257,000        
Business loans secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL   5,492,000      
Nonaccrual loans 7,226,000        
Nonaccrual Loans with No ACL 7,226,000        
Business loans secured by real estate | SBA secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 6,567,000   2,119,000 1,824,000 901,000
Nonaccrual loans 1,143,000        
Nonaccrual Loans with No ACL 1,143,000        
Business loans secured by real estate | CRE owner-occupied          
Financing Receivable, Nonaccrual [Line Items]          
ACL 50,517,000   2,781,000 1,908,000 923,000
Nonaccrual loans 6,083,000        
Nonaccrual Loans with No ACL 6,083,000        
Commercial loans          
Financing Receivable, Nonaccrual [Line Items]          
ACL   20,118,000      
Nonaccrual loans 17,919,000        
Nonaccrual Loans with No ACL 16,678,000        
Commercial loans | Commercial and industrial          
Financing Receivable, Nonaccrual [Line Items]          
ACL 46,964,000   13,857,000 13,695,000 11,018,000
Nonaccrual loans 3,974,000        
Nonaccrual Loans with No ACL 2,733,000        
Commercial loans | Franchise non-real estate secured          
Financing Receivable, Nonaccrual [Line Items]          
ACL 20,525,000   5,816,000 6,066,000 5,191,000
Nonaccrual loans 13,238,000        
Nonaccrual Loans with No ACL 13,238,000        
Commercial loans | SBA non-real estate secured          
Financing Receivable, Nonaccrual [Line Items]          
ACL 995,000   445,000 654,000 594,000
Nonaccrual loans 707,000        
Nonaccrual Loans with No ACL 707,000        
Retail loans          
Financing Receivable, Nonaccrual [Line Items]          
ACL   $ 1,061,000      
Nonaccrual loans 15,000        
Nonaccrual Loans with No ACL 15,000        
Retail loans | Single family residential          
Financing Receivable, Nonaccrual [Line Items]          
ACL 1,204,000   $ 655,000 $ 808,000 $ 804,000
Nonaccrual loans 15,000        
Nonaccrual Loans with No ACL 15,000        
Collateral Dependent Loans          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 14,037,000        
Collateral Dependent Loans | Investor loans secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 4,049,000        
Collateral Dependent Loans | Investor loans secured by real estate | CRE non-owner-occupied          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 2,792,000        
Collateral Dependent Loans | Investor loans secured by real estate | SBA secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 1,257,000        
Collateral Dependent Loans | Business loans secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 7,226,000        
Collateral Dependent Loans | Business loans secured by real estate | SBA secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 1,143,000        
Collateral Dependent Loans | Business loans secured by real estate | CRE owner-occupied          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 6,083,000        
Collateral Dependent Loans | Commercial loans          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 2,747,000        
Collateral Dependent Loans | Commercial loans | Commercial and industrial          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 2,040,000        
Collateral Dependent Loans | Commercial loans | Franchise non-real estate secured          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 0        
Collateral Dependent Loans | Commercial loans | SBA non-real estate secured          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 707,000        
Collateral Dependent Loans | Retail loans          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 15,000        
Collateral Dependent Loans | Retail loans | Single family residential          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 15,000        
Non-Collateral Dependent Loans          
Financing Receivable, Nonaccrual [Line Items]          
ACL 126,000        
Nonaccrual loans 15,172,000        
Non-Collateral Dependent Loans | Investor loans secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 0        
Non-Collateral Dependent Loans | Investor loans secured by real estate | CRE non-owner-occupied          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 0        
Non-Collateral Dependent Loans | Investor loans secured by real estate | SBA secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 0        
Non-Collateral Dependent Loans | Business loans secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 0        
Non-Collateral Dependent Loans | Business loans secured by real estate | SBA secured by real estate          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 0        
Non-Collateral Dependent Loans | Business loans secured by real estate | CRE owner-occupied          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 0        
Non-Collateral Dependent Loans | Commercial loans          
Financing Receivable, Nonaccrual [Line Items]          
ACL 126,000        
Nonaccrual loans 15,172,000        
Non-Collateral Dependent Loans | Commercial loans | Commercial and industrial          
Financing Receivable, Nonaccrual [Line Items]          
ACL 126,000        
Nonaccrual loans 1,934,000        
Non-Collateral Dependent Loans | Commercial loans | Franchise non-real estate secured          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 13,238,000        
Non-Collateral Dependent Loans | Commercial loans | SBA non-real estate secured          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 0        
Non-Collateral Dependent Loans | Retail loans          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans 0        
Non-Collateral Dependent Loans | Retail loans | Single family residential          
Financing Receivable, Nonaccrual [Line Items]          
ACL 0        
Nonaccrual loans $ 0