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Organization and Summary of Significant Accounting Policies - Impact of new accounting pronouncements - Schedule of Adoption of ASU 2016-30 (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 01, 2020
Jun. 30, 2020
Dec. 31, 2020
As reported under ASU 2016-13 | Loans Receivable      
Impact of adoption of ASU 2016-13 $ 2,142,363,000    
As reported under ASU 2016-13 | Allowance for credit losses on loans | Consumer Loan      
Impact of adoption of ASU 2016-13 2,247,000    
As reported under ASU 2016-13 | Allowance for credit losses on loans | Commercial Loan      
Impact of adoption of ASU 2016-13 5,952,000    
As reported under ASU 2016-13 | Allowance for credit losses on loans | Real Estate Loan | Construction Real Estate      
Impact of adoption of ASU 2016-13 1,889,000    
As reported under ASU 2016-13 | Allowance for credit losses on loans | Real Estate Loan | Residential real estate loans      
Impact of adoption of ASU 2016-13 8,396,000    
As reported under ASU 2016-13 | Allowance for credit losses on loans | Real Estate Loan | Commercial Real Estate      
Impact of adoption of ASU 2016-13 15,988,000    
As reported under ASU 2016-13 | Total allowance for credit losses on loans      
Impact of adoption of ASU 2016-13 34,472,000    
As reported under ASU 2016-13 | Total allowance for credit losses on off-balance sheet credit exposures      
Impact of adoption of ASU 2016-13 2,227,000    
As reported prior to ASU 2016-13 | Loans Receivable      
Impact of adoption of ASU 2016-13 2,141,929,000    
As reported prior to ASU 2016-13 | Allowance for credit losses on loans | Consumer Loan      
Impact of adoption of ASU 2016-13 1,182,000    
As reported prior to ASU 2016-13 | Allowance for credit losses on loans | Commercial Loan      
Impact of adoption of ASU 2016-13 4,940,000    
As reported prior to ASU 2016-13 | Allowance for credit losses on loans | Real Estate Loan | Construction Real Estate      
Impact of adoption of ASU 2016-13 2,010,000    
As reported prior to ASU 2016-13 | Allowance for credit losses on loans | Real Estate Loan | Residential real estate loans      
Impact of adoption of ASU 2016-13 4,875,000    
As reported prior to ASU 2016-13 | Allowance for credit losses on loans | Real Estate Loan | Commercial Real Estate      
Impact of adoption of ASU 2016-13 12,132,000    
As reported prior to ASU 2016-13 | Total allowance for credit losses on loans      
Impact of adoption of ASU 2016-13 25,139,000    
As reported prior to ASU 2016-13 | Total allowance for credit losses on off-balance sheet credit exposures      
Impact of adoption of ASU 2016-13 1,959,000    
Impact of adoption ASU 2016-13      
Increase to the ACL   $ 8,900,000  
Increase in ACL due to transition from PCI to PCD methodology   $ 434,000  
Adjustment to the reserve for unfunded commitments     $ 268,000
Retained earnings     $ 7,200,000
Impact of adoption ASU 2016-13 | Loans Receivable      
Impact of adoption of ASU 2016-13 434,000    
Impact of adoption ASU 2016-13 | Allowance for credit losses on loans | Consumer Loan      
Impact of adoption of ASU 2016-13 1,065,000    
Impact of adoption ASU 2016-13 | Allowance for credit losses on loans | Commercial Loan      
Impact of adoption of ASU 2016-13 1,012,000    
Impact of adoption ASU 2016-13 | Allowance for credit losses on loans | Real Estate Loan | Construction Real Estate      
Impact of adoption of ASU 2016-13 (121,000)    
Impact of adoption ASU 2016-13 | Allowance for credit losses on loans | Real Estate Loan | Residential real estate loans      
Impact of adoption of ASU 2016-13 3,521,000    
Impact of adoption ASU 2016-13 | Allowance for credit losses on loans | Real Estate Loan | Commercial Real Estate      
Impact of adoption of ASU 2016-13 3,856,000    
Impact of adoption ASU 2016-13 | Total allowance for credit losses on loans      
Impact of adoption of ASU 2016-13 9,333,000    
Impact of adoption ASU 2016-13 | Total allowance for credit losses on off-balance sheet credit exposures      
Impact of adoption of ASU 2016-13 $ 268,000