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Fair Value - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jul. 07, 2020
Assets
Derivative financial instruments	$ 802,800	$ 15,300
Trading securities			$ 10,674
Securities available for sale	3,330,672	1,956,047
Liabilities
Derivative financial instruments	802,700	16,500
Changes in fair value of assets
Transfers of assets between Level 2 to Level 1	0	0
Transfers of liabilities between Level 1 to Level 2	0	0
Transfers of liabilities between Level 2 to Level 1	0	0
Government-sponsored entities debt
Assets
Securities available for sale	29,256	25,941
State and municipal obligations
Assets
Securities available for sale	520,039	208,415
Corporate securities.
Assets
Securities available for sale	13,702
Significant Other Observable Inputs (Level 2)
Assets
Loans held for sale	290,467	59,363
Trading securities	10,674
Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	43,820	30,525
Changes in fair value of assets
Changes in hierarchy classifications of Level 3 assets	0
Changes in hierarchy classifications of Level 3 liabilities	0
Recurring basis
Assets
Derivative financial instruments	813,899	16,252
Loans held for sale	290,467	59,363
Trading securities	10,674
Securities available for sale	3,330,672	1,956,047
Mortgage servicing rights	43,820	30,525
Fair value of Assets, Total	4,489,532	2,062,187
Liabilities
Derivative financial instruments	804,832	31,273
Changes in fair value of assets
Transfers of assets between Level 1 to Level 2	0	0
Recurring basis | Government-sponsored entities debt
Assets
Securities available for sale	29,256	25,941
Recurring basis | State and municipal obligations
Assets
Securities available for sale	520,039	208,415
Recurring basis | Mortgage-backed securities
Assets
Securities available for sale	2,767,675	1,721,691
Recurring basis | Corporate securities.
Assets
Securities available for sale	13,702
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Derivative financial instruments	813,899	16,252
Loans held for sale	290,467	59,363
Trading securities	10,674
Securities available for sale	3,330,672	1,956,047
Fair value of Assets, Total	4,445,712	2,031,662
Liabilities
Derivative financial instruments	804,832	31,273
Recurring basis | Significant Other Observable Inputs (Level 2) | Government-sponsored entities debt
Assets
Securities available for sale	29,256	25,941
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations
Assets
Securities available for sale	520,039	208,415
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
Assets
Securities available for sale	2,767,675	1,721,691
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities.
Assets
Securities available for sale	13,702
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	43,820	30,525
Fair value of Assets, Total	43,820	30,525
Changes in fair value of assets
Fair value of assets at the beginning of the period	30,525	34,727
Servicing assets that resulted from transfers of financial assets	28,456	7,363
Changes in fair value assets due to valuation inputs or assumptions	(6,991)	(6,976)
Changes in fair value due to decay	(8,170)	(4,589)
Fair value of assets at the end of the period	43,820	30,525
Unrealized losses included in accumulated other comprehensive income related to Level 3 financial assets and liabilities	$ 0	$ 0

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- Definition

Represents the amount of servicing assets that resulted from transfers of financial assets.

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- Definition

The element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, the element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The item represents residential mortgage servicing rights as presented on the statement of financial position which are due to the entity as of the balance sheet date.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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