Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Schedule of Investment Securities Available for Sale and Aggregated by Investment Category and Length of Time Individual Securities in Continuous Unrealized Loss Position (Details)

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Investment Securities - Schedule of Investment Securities Available for Sale and Aggregated by Investment Category and Length of Time Individual Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months $ 357,249 $ 70,685
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 6,571 376
Investment Securities, Available for sale, Fair Value 357,249 70,685
Investment Securities, Available for sale, Unrealized Loss 6,571 376
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months 3,637  
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 135  
Investment Securities, Available for sale, Fair Value 3,637  
Investment Securities, Available for sale, Unrealized Loss 135  
State and Municipal Obligations    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months 20,837  
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 203  
Investment Securities, Available for sale, Fair Value 20,837  
Investment Securities, Available for sale, Unrealized Loss 203  
Residential Mortgage-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months 332,775 53,598
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 6,233 267
Investment Securities, Available for sale, Fair Value 332,775 53,598
Investment Securities, Available for sale, Unrealized Loss $ 6,233 267
Corporate Bonds and Other Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months   17,087
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months   109
Investment Securities, Available for sale, Fair Value   17,087
Investment Securities, Available for sale, Unrealized Loss   $ 109