Loans and Leases - Schedule of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 23,638,000	$ 19,757,000
Loans and leases, allowance for losses	57,000	53,000
Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	22,925,000	18,888,000
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	27,000
Lease Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	713,000	842,000
Individually evaluated for impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	15,000
Individually evaluated for impairment | Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	15,000
Individually evaluated for impairment | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Individually evaluated for impairment | Lease Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Collectively evaluated for impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	23,638,000	19,742,000
Collectively evaluated for impairment | Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	22,925,000	18,873,000
Collectively evaluated for impairment | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	27,000
Collectively evaluated for impairment | Lease Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	713,000	842,000
Senior Secured Bank Loans | Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, allowance for losses	$ 0	$ 195