Securities - Unrealized Gains (Losses) of Debt Securities (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Gains	[1]	$ 32,281	$ 11,659
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Losses	[1]	(11)	(953)
Total unrealized gains/(losses) on debt securities available-for-sale, Net Unrealized Gains/(Losses)		32,270	10,706
Income tax (expense) benefit, Gross Unrealized Gains		(6,873)	(2,486)
Income tax (expense) benefit, Gross Unrealized Losses		2	203
Income tax (expense) benefit, Net Unrealized Gains/(Losses)		(6,871)	(2,283)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Loss, Gross Unrealized Gains		25,408	9,173
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Loss, Gross Unrealized Losses		(9)	(750)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Loss, Net Unrealized Gains/(Losses)		$ 25,399	$ 8,423

[1] Excludes interest receivable of $3.5 million at March 31, 2020 and $3.4 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.