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Basis of Accounting and Consolidation - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 06, 2020
Jan. 02, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Apr. 21, 2020
Jan. 01, 2020
Dec. 31, 2019
Basis Of Accounting And Consolidation [Line Items]                
Loans acquired           $ 183,000,000    
Stock plans, term     10 years          
Maximum number of shares to be issued in stock incentive plan (in shares)     399,983          
Employee discount for employee stock purchase plan     5.00%          
Employee stock purchase plan, number of shares authorized     600,000          
Stock issued during period, shares, employee stock purchase plans     3,142 3,804        
Captive maximum gross premiums     $ 2,300,000          
Cumulative change in accounting principal     601,884,000 $ 533,051,000 $ 568,228,000     $ 526,609,000
Allowance for credit losses on loans     $ 55,418,000 $ 32,876,000 $ 41,910,000     26,911,000
ASU 2016-13                
Basis Of Accounting And Consolidation [Line Items]                
Allowance for credit losses on loans             $ 28,583,000  
Off-balance sheet, credit loss, liability             69,000  
Allowance for credit losses, held-to-maturity debt securities             0  
Amortized cost of PCD assets reflected the addition to allowance for credit losses   $ 833,000            
ASU 2016-13 | Impact of ASU                
Basis Of Accounting And Consolidation [Line Items]                
Allowance for credit losses on loans             1,672,000  
Off-balance sheet, credit loss, liability             69,000  
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13                
Basis Of Accounting And Consolidation [Line Items]                
Cumulative change in accounting principal             $ 717,000 (717,000)
Allowance for credit losses on loans               $ 1,672,000
Stock Options                
Basis Of Accounting And Consolidation [Line Items]                
Common stock awarded in SI plan (in shares)     0          
Restricted Stock                
Basis Of Accounting And Consolidation [Line Items]                
Common stock awarded in SI plan (in shares)     27,750   25,200      
Restricted Stock Units (RSUs)                
Basis Of Accounting And Consolidation [Line Items]                
Common stock awarded in SI plan (in shares)     16,950   16,200      
3.95% Subordinated Notes due 2030                
Basis Of Accounting And Consolidation [Line Items]                
Aggregate principal amount $ 96,000,000.0              
Fixed-to-Floating Rate 3.95%              
Maturity date Oct. 15, 2030              
Redemption description The Company may, beginning with the interest payment date of October 15, 2025, and on any interest payment date thereafter, redeem the Notes, in whole or in part, at a redemption price equal to 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest to but excluding the date of redemption. The Company may also redeem the Notes at any time, including prior to October 15, 2025, at the Company’s option, in whole but not in part, if: (i) a change or prospective change in law occurs that could prevent the Company from deducting interest payable on the Notes for U.S. federal income tax purposes; (ii) a subsequent event occurs that could preclude the Notes from being recognized as Tier 2 capital for regulatory capital purposes; or (iii) the Company is required to register as an investment company under the Investment Company Act of 1940, as amended; in each case, at a redemption price equal to 100% of the principal amount of the Notes plus any accrued and unpaid interest to but excluding the redemption date.              
3.95% Subordinated Notes due 2030 | SOFR                
Basis Of Accounting And Consolidation [Line Items]                
Description floating rate basis three-month Term SOFR              
Basis points 3.83%