Loans - Schedule of Loans Renegotiated in Troubled Debt Restructurings (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) note
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | note		1
Total loans restructured during period	$ 0.0	$ 0.2
Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | note		1
Total loans restructured during period		$ 0.2
Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Total loans restructured during period		0.0
Interest only period | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Total loans restructured during period		0.0
Extension of term or amortization schedule
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Total loans restructured during period		0.2
Extension of term or amortization schedule | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Total loans restructured during period		0.2
Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Total loans restructured during period		0.0
Interest rate adjustment | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Total loans restructured during period		0.0
Other
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Total loans restructured during period		0.0
Other | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Total loans restructured during period		$ 0.0