Loans - Schedule of Outstanding Balance and Related Allowance on Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loan Balance	$ 5,847,484	$ 2,874,688
ACL Balance		$ 31,243
Loan Purchase [Member]
Loan Balance	65,801
ACL Balance	4,617
Loan Purchase [Member] | Real Estate [Member]
Loan Balance	39,229
ACL Balance	2,487
Loan Purchase [Member] | Real Estate [Member] | Residential Portfolio Segment [Member]
Loan Balance	14,895
ACL Balance	201
Loan Purchase [Member] | Real Estate [Member] | Commercial Portfolio Segment
Loan Balance	24,334
ACL Balance	2,286
Loan Purchase [Member] | Other Loans [Member]
Loan Balance	26,572
ACL Balance	2,130
Loan Purchase [Member] | Other Loans [Member] | Commercial Loan Portfolio Segment [Member]
Loan Balance	20,990
ACL Balance	1,896
Loan Purchase [Member] | Other Loans [Member] | Home Equity and Improvement Portfolio Segment [Member]
Loan Balance	4,912
ACL Balance	214
Loan Purchase [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Loan Balance	670
ACL Balance	$ 20