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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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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The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Amount excluding accrued interest, after allowance for credit loss, of financing receivable.

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

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Amount, after the effects of master netting arrangements, of 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 and not elected to be offset.

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Amount of time deposit liabilities, including certificates of deposit.

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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market, and other interest-earning investments	$ 1,976,552	$ 822,019
Investment securities held to maturity	2,082,242	0
Loans, net	28,055,737	13,494,505
Accrued interest receivable	136,975	84,109
Noninterest-bearing demand deposits	12,463,136	6,303,106
Time deposits	2,544,011	960,413
Federal funds purchased and interbank borrowings	1,721	276
Securities sold under agreements to repurchase	509,275	392,275	$ 395,242
Federal Home Loan Bank advances	3,239,357	1,886,019
Other borrowings	597,207	296,670
U.S. government-sponsored entities and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	528,524
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	463,111
States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	1,090,667
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market, and other interest-earning investments	1,976,552	822,019
Accrued interest receivable	136,975	84,109
Noninterest-bearing demand deposits	12,463,136	6,303,106
Checking, NOW, savings, and money market interest-bearing deposits	20,600,243	11,305,676
Time deposits	2,544,011	960,413
Federal funds purchased and interbank borrowings	1,721	276
Securities sold under agreements to repurchase	509,275	392,275
Federal Home Loan Bank advances	3,239,357	1,886,019
Other borrowings	597,207	296,670
Accrued interest payable	6,311	5,496
Standby letters of credit	415	454
Commitments to extend credit	0	0
Carrying Value \| U.S. government-sponsored entities and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	528,524
Carrying Value \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	463,111
Carrying Value \| States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	1,090,507
Carrying Value \| Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	100
Carrying Value \| Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	8,523,614	3,363,175
Carrying Value \| Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	11,196,343	6,315,574
Carrying Value \| Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	5,688,903	2,245,942
Carrying Value \| Consumer credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	2,646,877	1,569,814
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market, and other interest-earning investments	1,976,552	822,019
Accrued interest receivable	948	688
Noninterest-bearing demand deposits	12,463,136	6,303,106
Checking, NOW, savings, and money market interest-bearing deposits	20,600,243	11,305,676
Time deposits	0	0
Federal funds purchased and interbank borrowings	1,721	276
Securities sold under agreements to repurchase	509,275	392,275
Federal Home Loan Bank advances	0	0
Other borrowings	0	0
Accrued interest payable	0	0
Standby letters of credit	0	0
Commitments to extend credit	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government-sponsored entities and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Consumer credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market, and other interest-earning investments	0	0
Accrued interest receivable	39,859	35,790
Noninterest-bearing demand deposits	0	0
Checking, NOW, savings, and money market interest-bearing deposits	0	0
Time deposits	2,531,360	968,658
Federal funds purchased and interbank borrowings	0	0
Securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	3,234,585	1,935,140
Other borrowings	582,231	311,532
Accrued interest payable	6,311	5,496
Standby letters of credit	0	0
Commitments to extend credit	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| U.S. government-sponsored entities and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	480,409
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	441,054
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	1,034,033
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	100
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) \| Consumer credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	0	0
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, due from banks, money market, and other interest-earning investments	0	0
Accrued interest receivable	96,168	47,631
Noninterest-bearing demand deposits	0	0
Checking, NOW, savings, and money market interest-bearing deposits	0	0
Time deposits	0	0
Federal funds purchased and interbank borrowings	0	0
Securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	0	0
Other borrowings	0	0
Accrued interest payable	0	0
Standby letters of credit	415	454
Commitments to extend credit	1,882	4,678
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| U.S. government-sponsored entities and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	0
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	0
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	0
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities held to maturity	0
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	8,458,138	3,335,009
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	11,078,838	6,211,854
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	5,603,201	2,216,900
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) \| Consumer credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	$ 2,634,122	$ 1,582,600