Loans - Schedule of Outstanding Balance and Related Allowance on Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Loan Balance	$ 5,028,058	$ 2,715,078
ACL Balance		$ 31,243
Loan Purchase [Member]
Loan Balance	89,197
ACL Balance	7,909
Loan Purchase [Member] | Real Estate [Member]
Loan Balance	55,755
ACL Balance	5,332
Loan Purchase [Member] | Real Estate [Member] | Residential [Member]
Loan Balance	17,651
ACL Balance	1,345
Loan Purchase [Member] | Real Estate [Member] | Commercial Portfolio Segment [Member]
Loan Balance	37,070
ACL Balance	3,935
Loan Purchase [Member] | Real Estate [Member] | Construction [Member]
Loan Balance	1,034
ACL Balance	52
Loan Purchase [Member] | Other Loans [Member]
Loan Balance	33,442
ACL Balance	2,577
Loan Purchase [Member] | Other Loans [Member] | Commercial [Member]
Loan Balance	25,921
ACL Balance	2,255
Loan Purchase [Member] | Other Loans [Member] | Home Equity and Improvement [Member]
Loan Balance	6,268
ACL Balance	258
Loan Purchase [Member] | Other Loans [Member] | Consumer Portfolio Segment [Member]
Loan Balance	1,253
ACL Balance	$ 64