Loans, Leases and Allowance for Credit Loans, Leases and Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 226.8	$ 196.2
Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	214.2	144.9
Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	12.6	51.3
Tech & Innovation [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	27.3
Tech & Innovation [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Tech & Innovation [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	27.3
Other commercial and industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	12.5	23.6
Other commercial and industrial [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Other commercial and industrial [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	12.5	23.6
Commercial Real Estate Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	23.0	42.6
Commercial Real Estate Owner Occupied [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	23.0	42.6
Commercial Real Estate Owner Occupied [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Hotel franchise finance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	155.7	27.1
Hotel franchise finance [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	155.7	27.1
Hotel franchise finance [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Other Commercial Real Estate Non owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	31.6	73.7
Other Commercial Real Estate Non owner Occupied [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	31.6	73.7
Other Commercial Real Estate Non owner Occupied [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Construction and land development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	3.9	1.5
Construction and land development [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	3.9	1.5
Construction and land development [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Other, loan segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.1	0.4
Other, loan segment [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Other, loan segment [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 0.1	$ 0.4