Loans - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Receivables [Abstract]
Income had interest on non-accrual loans been accrued	$ 600,000	$ 800,000	$ 2,000,000.0	$ 1,600,000
Loans renegotiated in troubled debt restructurings	19,500,000		19,500,000		$ 23,400,000
Troubled restructurings included in non-accrual loans	14,000,000.0		14,000,000.0		17,800,000
Loans renegotiated in troubled debt restructurings, accrual loans	5,500,000		5,500,000		$ 5,600,000
Troubled debt restructurings	0		200,000
Charge-offs directly related to modifying troubled debt restructurings	0	$ 0	0	$ 0
Balance of defaulted loans under trouble debt restructurings	$ 0		$ 0