Loans and Leases - Schedule of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 19,757,000	$ 18,799,000
Loans and leases, allowance for losses	53,000	46,000
Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	18,888,000	17,856,000
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	27,000	28,000
Lease Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	842,000	915,000
Individually evaluated for impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,000	0
Individually evaluated for impairment | Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,000	0
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	19,742,000	18,799,000
Collectively evaluated for impairment | Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	18,873,000	17,856,000
Collectively evaluated for impairment | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	27,000	28,000
Collectively evaluated for impairment | Lease Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	842,000	$ 915,000
Senior Secured Bank Loans | Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, allowance for losses	$ 195