Deposits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Banking and Thrift, Interest [Abstract]
Checking, non-interest bearing	$ 699,231	$ 627,114
Checking, interest bearing	941,630	951,903
Savings accounts	2,258,250	2,126,183
Certificates of deposit	458,989	476,544
Total deposits	$ 4,358,100	$ 4,181,744
Percentage Change, Checking, non-interest bearing	11.50%
Percentage Change, Checking, interest bearing	(1.10%)
Percentage Change, Savings accounts	6.20%
Percentage Change, Certificates of deposit	(3.70%)
Percentage Change	4.20%