Loans - Schedule of Loans Renegotiated in Troubled Debt Restructurings (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Loans renegotiated in troubled debt restructurings	$ 34,900,000		$ 44,500,000
Loans renegotiated in troubled debt restructurings, non-accrual loans	28,000,000		31,900,000
Loans renegotiated in troubled debt restructurings, accrual loans	6,900,000		$ 12,600,000
Loans restructured during period	0
Charge-offs directly related to modifying troubled debt restructurings	0	$ 0
Balance of defaulted loans under trouble debt restructurings	0
Commitments to lend additional funds	$ 0