Loans - Summary of Amortized Cost Basis of Collateral-dependent Loans by Class of Loans and Collateral Type (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	$ 5,381,631	$ 2,746,321
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	36,638
Equipment and Machinery [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	8,377
Inventory and Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	8,132
Vehicles [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	171
Collateral Pledged [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	53,318
Real Estate Loans [Member] | Real Estate [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	7,792
Real Estate Loans [Member] | Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	26,769
Real Estate Loans [Member] | Collateral Pledged [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	7,792
Real Estate Loans [Member] | Collateral Pledged [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	26,769
Other Loans [Member] | Real Estate [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	2,077
Other Loans [Member] | Equipment and Machinery [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	8,377
Other Loans [Member] | Inventory and Receivables [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	8,132
Other Loans [Member] | Vehicles [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	171
Other Loans [Member] | Collateral Pledged [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	$ 18,757