Allowance for Loan Losses - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ 120,185			$ 52,162
Provision for credit losses on loans	26,350	$ 1,500
Cumulative Effect, Period Of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses			$ 42,484
Real estate – construction:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses on loans	2,390	$ 16
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses on loans	$ 152
Minimum | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term	2 years
Minimum | Residential | Real estate – construction:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term	9 months
Minimum | Commercial | Real estate – construction:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term	24 months
Maximum | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term	5 years
Maximum | Residential | Real estate – construction:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term	12 months
Maximum | Commercial | Real estate – construction:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term	36 months