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Investment securities - Schedule of Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months $ 485,845 $ 185,695
Unrealized Loss, Less than 12 months (7,094) (824)
Fair Value, 12 months or more 0 0
Unrealized Loss, 12 months or more 0 0
Fair Value, Total 485,845 185,695
Unrealized Loss, Total (7,094) (824)
Mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 402,455 182,012
Unrealized Loss, Less than 12 months (6,598) (803)
Fair Value, 12 months or more 0 0
Unrealized Loss, 12 months or more 0 0
Fair Value, Total 402,455 182,012
Unrealized Loss, Total (6,598) (803)
Mortgage-backed securities - commercial    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 20,636  
Unrealized Loss, Less than 12 months (10)  
Fair Value, 12 months or more 0  
Unrealized Loss, 12 months or more 0  
Fair Value, Total 20,636  
Unrealized Loss, Total (10)  
Municipal securities    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 60,771 3,184
Unrealized Loss, Less than 12 months (469) (20)
Fair Value, 12 months or more 0 0
Unrealized Loss, 12 months or more 0 0
Fair Value, Total 60,771 3,184
Unrealized Loss, Total (469) (20)
Corporate securities    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 1,983 499
Unrealized Loss, Less than 12 months (17) (1)
Fair Value, 12 months or more 0
Unrealized Loss, 12 months or more 0
Fair Value, Total 1,983 499
Unrealized Loss, Total $ (17) $ (1)