Loans - Summary of Amortized Cost Basis of Collateral-dependent Loans by Class of Loans and Collateral Type (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	$ 5,409,161	$ 2,746,321
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	36,449
Equipment and Machinery [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	5,317
Inventory and Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	4,943
Vehicles [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	125
Collateral Pledged [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	46,834
Real Estate Loans [Member] | Real Estate [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	1,024
Real Estate Loans [Member] | Real Estate [Member] | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	33,999
Real Estate Loans [Member] | Collateral Pledged [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	1,024
Real Estate Loans [Member] | Collateral Pledged [Member] | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	33,999
Other Loans [Member] | Real Estate [Member] | Commercial Loan Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	1,426
Other Loans [Member] | Equipment and Machinery [Member] | Commercial Loan Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	5,317
Other Loans [Member] | Inventory and Receivables [Member] | Commercial Loan Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	4,943
Other Loans [Member] | Vehicles [Member] | Commercial Loan Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	125
Other Loans [Member] | Collateral Pledged [Member] | Commercial Loan Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	$ 11,811