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Fair Value - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Assets
Derivative financial instruments	$ 398,200		$ 802,800
Securities available for sale	3,891,490		3,330,672
Liabilities
Derivative financial instruments	398,200		802,700
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	1,548,682		1,367,132
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	580,379		240,108
State and municipal obligations
Assets
Securities available for sale	596,103		520,039
Corporate securities.
Assets
Securities available for sale	13,686		13,702
Significant Other Observable Inputs (Level 2)
Assets
Loans held for sale	352,997		290,467
Trading securities	83,947		10,674
Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	54,285		43,820
Changes in fair value of assets
Fair value of assets at the beginning of the period	43,820
Servicing assets that resulted from transfers of financial assets	6,950
Changes in fair value assets due to valuation inputs or assumptions	6,575
Changes in fair value due to decay	(3,060)
Fair value of assets at the end of the period	54,285
Changes in hierarchy classifications of Level 3 liabilities	0
Recurring basis
Assets
Derivative financial instruments	416,329		813,899
Loans held for sale	352,997		290,467
Trading securities	83,947		10,674
Securities available for sale	3,891,490		3,330,672
Mortgage servicing rights	54,285		43,820
Fair value of Assets, Total	4,799,048		4,489,532
Liabilities
Derivative financial instruments	402,256		804,832
Recurring basis | Government-sponsored entities debt
Assets
Securities available for sale	23,553		29,256
Recurring basis | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	1,544,600		1,379,978
Recurring basis | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises [Member]
Assets
Securities available for sale	694,632		650,646
Recurring basis | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale		$ 580,379	334,834
Recurring basis | State and municipal obligations
Assets
Securities available for sale	596,103		520,039
Recurring basis | Mortgage-backed securities
Assets
Securities available for sale	438,537		402,217
Recurring basis | Corporate securities.
Assets
Securities available for sale	13,686		13,702
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Derivative financial instruments	416,329		813,899
Loans held for sale	352,997		290,467
Trading securities	83,947		10,674
Securities available for sale	3,891,490		3,330,672
Fair value of Assets, Total	4,744,763		4,445,712
Liabilities
Derivative financial instruments	402,256		804,832
Recurring basis | Significant Other Observable Inputs (Level 2) | Government-sponsored entities debt
Assets
Securities available for sale	23,553		29,256
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	1,544,600		1,379,978
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises [Member]
Assets
Securities available for sale	694,632		650,646
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale		$ 580,379	334,834
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations
Assets
Securities available for sale	596,103		520,039
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
Assets
Securities available for sale	438,537		402,217
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities.
Assets
Securities available for sale	13,686		13,702
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	54,285		43,820
Fair value of Assets, Total	54,285		$ 43,820
Changes in fair value of assets
Unrealized losses included in accumulated other comprehensive income related to Level 3 financial assets and liabilities	$ 0

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- Definition

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

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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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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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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 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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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 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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