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Fair Value Measurements - Estimated fair value of company's financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Federal funds sold	$ 42,697	$ 20,391
Interest bearing deposits with other banks	369,337	1,680,945
Investment securities available-for-sale	1,755,254	2,623,408
Investment securities, held-to-maturity, estimated fair value	1,084,706	0
Federal Reserve and Federal Home Loan Bank stock	33,990	34,153
Interest bearing deposits	985,431	777,255
Customer repurchase agreements	26,539	23,918
Fair Value, Inputs, Level 2 | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	11	47
Carrying Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	13,132	12,886
Federal funds sold	42,697	20,391
Interest bearing deposits with other banks	369,337	1,680,945
Investment securities available-for-sale	1,755,254	2,623,408
Investment securities, held-to-maturity, estimated fair value	1,143,632
Federal Reserve and Federal Home Loan Bank stock	33,990	34,153
Loans held for sale	13,814	47,218
Loans	7,082,021	7,065,598
Annuity investment	13,907
Noninterest bearing deposits	2,831,934	3,277,956
Interest bearing deposits	5,726,611	5,974,502
Time deposits	613,073	729,082
Customer repurchase agreements	26,539	23,918
Borrowings	349,732	369,670
Carrying Value | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	254	636
Derivative liability	20
Carrying Value | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	11	47
Carrying Value | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	18,589	5,197
Derivative liability	17,662	5,147
Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	13,132	12,886
Federal funds sold	42,697	20,391
Interest bearing deposits with other banks	369,337	1,680,945
Investment securities available-for-sale	1,755,254	2,623,408
Investment securities, held-to-maturity, estimated fair value	1,084,706
Federal Reserve and Federal Home Loan Bank stock	33,990	34,153
Loans held for sale	13,814	47,218
Loans	6,972,568	6,930,929
Annuity investment	13,907
Noninterest bearing deposits	2,831,934	3,277,956
Interest bearing deposits	5,726,611	5,974,502
Time deposits	610,373	736,001
Customer repurchase agreements	26,539	23,918
Borrowings	350,557	374,326
Fair Value | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	254	636
Derivative liability	20
Fair Value | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	11	47
Fair Value | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	18,589	5,197
Derivative liability	17,662	5,147
Fair Value | Fair Value, Inputs, Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	13,132	12,886
Federal funds sold	0	0
Interest bearing deposits with other banks	0	0
Investment securities available-for-sale	0	0
Investment securities, held-to-maturity, estimated fair value	0
Federal Reserve and Federal Home Loan Bank stock	0	0
Loans held for sale	0	0
Loans	0	0
Annuity investment	0
Noninterest bearing deposits	0	0
Interest bearing deposits	0	0
Time deposits	0	0
Customer repurchase agreements	0	0
Borrowings	0	0
Fair Value | Fair Value, Inputs, Level 1 | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	0	0
Derivative liability	0
Fair Value | Fair Value, Inputs, Level 1 | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	0	0
Fair Value | Fair Value, Inputs, Level 1 | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Fair Value | Fair Value, Inputs, Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	0	0
Federal funds sold	42,697	20,391
Interest bearing deposits with other banks	369,337	1,680,945
Investment securities available-for-sale	1,755,254	2,611,408
Investment securities, held-to-maturity, estimated fair value	1,084,706
Federal Reserve and Federal Home Loan Bank stock	33,990	34,153
Loans held for sale	13,814	47,218
Loans	0	0
Annuity investment	13,907
Noninterest bearing deposits	2,831,934	3,277,956
Interest bearing deposits	5,726,611	5,974,502
Time deposits	610,373	736,001
Customer repurchase agreements	26,539	23,918
Borrowings	350,557	374,326
Fair Value | Fair Value, Inputs, Level 2 | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	0	0
Derivative liability	0
Fair Value | Fair Value, Inputs, Level 2 | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	18,589	5,197
Derivative liability	17,662	5,147
Fair Value | Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and due from banks	0	0
Federal funds sold	0	0
Interest bearing deposits with other banks	0	0
Investment securities available-for-sale	0	12,000
Investment securities, held-to-maturity, estimated fair value	0
Federal Reserve and Federal Home Loan Bank stock	0	0
Loans held for sale	0	0
Loans	6,972,568	6,930,929
Annuity investment	0
Noninterest bearing deposits	0	0
Interest bearing deposits	0	0
Time deposits	0	0
Customer repurchase agreements	0	0
Borrowings	0	0
Fair Value | Fair Value, Inputs, Level 3 | Mortgage banking derivatives
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	254	636
Derivative liability	20
Fair Value | Fair Value, Inputs, Level 3 | Credit risk participation agreements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability	0	0
Fair Value | Fair Value, Inputs, Level 3 | Interest rate caps
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset	0	0
Derivative liability	$ 0	$ 0

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The aggregate fair value of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

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Fair value amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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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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Fair value portion 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.

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Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.

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Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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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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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of other liabilities.

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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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