Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Number of securities in an unrealized loss position | security	62	69
Unrealized losses	$ (3,000,000)	$ (6,700,000)
Unrealized losses, fair value	198,800,000	268,500,000
OTTI losses	0	0
Amortized cost of securities transferred from held to maturity to available for sale	37,600,000
Proceeds from sales of securities held to maturity	$ 0	2,702,000
Gross realized gains on sales of held-to-maturity securities		32,000
Gross realized losses on sales of held-to-maturity securities		$ 5,000