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Securities Securities - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities transferred to held-to-maturity portfolio			$ 179,800,000	$ 873,613,000	$ 0
Unrealized after tax gain on available for sale securities transferred to the held to maturity portfolio	$ 69,000,000.0			69,000,000.0
Securities pledged as collateral to secure public funds and other deposits or securities sold under agreements to repurchase	1,300,000,000			1,300,000,000
Secured borrowing under agreement to repurchase	194,600,000			194,600,000
Accumulated unrealized losses	40,691,000			40,691,000			$ 17,785,000
Fair value of securities	965,103,000			965,103,000			1,297,321,000
Allowance for credit losses - securities held-to-maturity	(188,000)			(188,000)		$ (10,000)	$ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(95,000)	$ (3,299,000)		247,000	(4,746,000)
Proceeds from Sale of Available-for-sale Securities				100,055,000	$ 476,702,000
Securities pledged as collateral
Debt Securities, Available-for-sale [Line Items]
Secured borrowing under agreement to repurchase	$ 194,600,000			$ 194,600,000

X

- Definition

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

+ References

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Unrealized after tax loss on available for sale securities transferred to the held to maturity portfolio

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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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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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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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The cash inflow associated with the sale of debt and equity securities classified as 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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