Loans and Leases (Loans and Leases Sold) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, reconciliation to cash flow, deductions from held-for-sale	$ 254,403	$ 462,454
Commercial Real Estate | Non-owner Occupied Term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, reconciliation to cash flow, deductions from held-for-sale	13,062	20,693
Commercial Real Estate | Owner Occupied Term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, reconciliation to cash flow, deductions from held-for-sale	47,221	33,986
Commercial Real Estate | Multifamily, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, reconciliation to cash flow, deductions from held-for-sale	0	129,879
Commercial Real Estate | Construction & Development, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, reconciliation to cash flow, deductions from held-for-sale	287	0
Commercial | Term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, reconciliation to cash flow, deductions from held-for-sale	16,278	11,849
Commercial | LOC & Other, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, reconciliation to cash flow, deductions from held-for-sale	187	0
Commercial | Leases and Equipment Finance, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, reconciliation to cash flow, deductions from held-for-sale	76,082	26,851
Residential | Mortgage, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable held-for-sale, reconciliation to cash flow, deductions from held-for-sale	$ 101,286	$ 239,196