Loans - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Receivables [Abstract]
Income had interest on non-accrual loans been accrued	$ 600,000	$ 800,000	$ 1,200,000	$ 1,700,000
Loans renegotiated in troubled debt restructurings	21,900,000		21,900,000		$ 23,400,000
Troubled restructurings included in non-accrual loans	16,200,000		16,200,000		17,800,000
Loans renegotiated in troubled debt restructurings, accrual loans	5,700,000		5,700,000		$ 5,600,000
Troubled debt restructurings	200,000		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