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Summary of Significant Accounting Policies (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]      
Operating Lease, Right-of-Use Asset   $ 13,636 $ 14,843
Number of reportable segments | segment   1  
Required reserves on deposits maintained     9,700
Operating Lease, Liability   $ 14,152 $ 15,461
sba loans receivable   296,000  
Servicing Asset   5,700  
Accrued interest receivable   $ 31,100  
Furniture, Fixtures and Equipment [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Property plant and equipment useful life   3 years  
Furniture, Fixtures and Equipment [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Property plant and equipment useful life   10 years  
Building and Leasehold Improvements [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Property plant and equipment useful life   10 years  
Building and Leasehold Improvements [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Property plant and equipment useful life   40 years  
Software [Member]      
Property, Plant and Equipment [Line Items]      
Property plant and equipment useful life   3 years  
Core Deposits [Member]      
Property, Plant and Equipment [Line Items]      
Finite-lived intangible assets useful life 10 years 10 years  
State and Local Jurisdiction [Member]      
Property, Plant and Equipment [Line Items]      
Right to receive state tax credit at agreed upon rates   10 years