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Securities Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral to secure public funds and other deposits or securities sold under agreements to repurchase	$ 1,200,000		$ 1,200,000
Secured borrowing under agreement to repurchase	154,200		154,200
Accumulated unrealized losses	10,457		10,457		$ 59,594
Fair value of securities	836,542		836,542		2,509,189
Debt Securities Available-for-sale Sold Amount	350,100		476,700
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(3,299)	$ 0	(4,746)	$ 22
Available-for-sale securities transferred to Held-to-Maturity					$ 179,800
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Secured borrowing under agreement to repurchase	$ 154,200		$ 154,200

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The amount of available-for-sale securities transferred to the held-to-maturity portfolio during the period, a non-cash item.

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Amount of investment in debt security, measured at fair value, sold.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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The fair value as of the balance sheet date of financial instruments and other positions owned by the entity and pledged to counterparties as collateral, including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, before effects of master netting arrangements, of securities loaned to entities in exchange for collateral and funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.

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