Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ 145,387		$ 145,387			$ 52,162
Provision for credit losses on loans	26,900	$ 900	53,250	$ 2,400
Cumulative Effect, Period Of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses					$ 42,484	$ 42,484
Real estate – construction:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses on loans	2,146	$ 524	4,536	$ 540
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses on loans	$ 219		$ 371
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