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Allowance for Credit Losses on Loans and Leases - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for credit losses on loans and leases   $ 197,758,000 $ 162,244,000 $ 194,043,000 $ 147,638,000 $ 159,820,000
Increase in allowance for credit losses on loans and leases $ 1,900,000 4,841,000 189,000 3,393,000 1,020,000  
Provision for loan losses   3,569,000 20,601,000 62,228,000 7,105,000 $ 18,256,000
Charge-offs   4,324,000 $ 10,385,000 22,178,000 20,307,000  
Off-balance sheet credit exposures before adoption of CECL $ 12,500,000          
Unfunded Loan Commitment            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for credit losses   12,300,000   11,900,000 $ 461,000  
CARES Act            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for credit losses on loans and leases   197,800,000   194,000,000.0    
Increase in allowance for credit losses on loans and leases   3,700,000   46,400,000    
Provision for loan losses   $ 3,600,000   63,300,000    
Charge-offs       $ 44,500,000