Securities - Gross and Net Realized Gains and Losses on Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2019	[1]	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Gross realized gains										$ 41	$ 0	$ 3,986
Gross realized losses										(67)	0	(986)
Net Realized (Losses)/Gains	$ (26)		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ (26)	$ 0	$ 3,000

[1] The DNB Merger is included in our consolidated financial statements beginning on December 1, 2019.