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Fair Value - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Assets
Derivative financial instruments	$ 516,600	$ 802,800
Securities available for sale	4,369,159	3,330,672
Liabilities
Derivative financial instruments	516,600	802,700
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	1,666,127	1,367,132
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	812,613	240,108
State and municipal obligations
Assets
Securities available for sale	693,128	520,039
Corporate securities.
Assets
Securities available for sale	13,892	13,702
Significant Other Observable Inputs (Level 2)
Assets
Loans held for sale	171,447	290,467
Trading securities	89,925	10,674
Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	57,351	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	15,496
Changes in fair value assets due to valuation inputs or assumptions	3,243
Changes in fair value due to decay	(5,208)
Fair value of assets at the end of the period	57,351
Changes in hierarchy classifications of Level 3 liabilities	0
Recurring basis
Assets
Derivative financial instruments	526,145	813,899
Loans held for sale	171,447	290,467
Trading securities	89,925	10,674
Securities available for sale	4,369,159	3,330,672
Mortgage servicing rights	57,351	43,820
Fair value of Assets, Total	5,214,027	4,489,532
Liabilities
Derivative financial instruments	518,221	804,832
Recurring basis | Government-sponsored entities debt
Assets
Securities available for sale	48,137	29,256
Recurring basis | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	1,666,127	1,367,132
Recurring basis | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises [Member]
Assets
Securities available for sale	666,777	755,551
Recurring basis | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	812,613	240,108
Recurring basis | State and municipal obligations
Assets
Securities available for sale	693,128	520,039
Recurring basis | Mortgage-backed securities
Assets
Securities available for sale	468,485	404,884
Recurring basis | Corporate securities.
Assets
Securities available for sale	13,892	13,702
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Derivative financial instruments	526,145	813,899
Loans held for sale	171,447	290,467
Trading securities	89,925	10,674
Securities available for sale	4,369,159	3,330,672
Fair value of Assets, Total	5,156,676	4,445,712
Liabilities
Derivative financial instruments	518,221	804,832
Recurring basis | Significant Other Observable Inputs (Level 2) | Government-sponsored entities debt
Assets
Securities available for sale	48,137	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	1,666,127	1,367,132
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	666,777	755,551
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	812,613	240,108
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations
Assets
Securities available for sale	693,128	520,039
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
Assets
Securities available for sale	468,485	404,884
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities.
Assets
Securities available for sale	13,892	13,702
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	57,351	43,820
Fair value of Assets, Total	57,351	$ 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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