Loans - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Receivables [Abstract]
Interest Income on Non-Accrual Loans if Accrued	$ 800,000	$ 900,000	$ 1,600,000	$ 1,800,000
Loans renegotiated in troubled debt restructurings	30,300,000		30,300,000		$ 44,500,000
Charge-offs directly related to modifying troubled debt restructurings	$ 0	$ 0	0	$ 0
Balance of defaulted loans under trouble debt restructurings			$ 0