Derivatives, Hedging Activities and Other Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Collateral already posted, fair value	$ 13,700	$ 4,100
Interest Rate Swap
Derivative [Line Items]
Income (expense) in fair value adjustments	(478)	(87)
Other liabilities
Derivative [Line Items]
Credit risk derivative liability, fair value	10,708	1,813
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	$ 337,600	$ 59,300