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FAIR VALUE MEASUREMENTS - Fair Values and Carrying Amounts (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial Assets
Trading security	$ 6,800	$ 8,400
Marketable equity securities	12,790	15,453
Securities available for sale, at fair value	1,470,949	1,877,585
Securities held to maturity	503,262	647,236
FHLB bank stock and restricted securities	7,264	10,800
Level 1
Financial Assets
Cash and cash equivalents	694,913	1,627,807
Trading security	0	0
Marketable equity securities	12,790	14,798
Securities available for sale, at fair value	0	0
Securities held to maturity	0	0
Net loans	0	0
Loans held for sale	0	0
Accrued interest receivable	0	0
Derivative assets	0	0
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term Federal Home Loan Bank advances and other	0	0
Subordinated borrowings	0	0
Derivative liabilities	0	0
Level 2
Financial Assets
Cash and cash equivalents	0	0
Trading security	0	0
Marketable equity securities	0	655
Securities available for sale, at fair value	1,467,029	1,873,555
Securities held to maturity	501,164	644,497
Net loans	0	0
Loans held for sale	550	6,110
Accrued interest receivable	40,444	33,534
Derivative assets	52,997	79,270
Financial Liabilities
Total deposits	9,944,085	10,073,217
Short-term debt	0	0
Long-term Federal Home Loan Bank advances and other	2,888	13,053
Subordinated borrowings	110,109	95,006
Derivative liabilities	101,745	35,194
Level 3
Financial Assets
Cash and cash equivalents	0	0
Trading security	6,812	8,354
Marketable equity securities	0	0
Securities available for sale, at fair value	3,920	4,030
Securities held to maturity	2,098	2,739
Net loans	7,798,562	6,850,975
Loans held for sale	3,574	0
Accrued interest receivable	0	0
Derivative assets	22	258
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term Federal Home Loan Bank advances and other	0	0
Subordinated borrowings	0	0
Derivative liabilities	0	0
Carrying Amount
Financial Assets
Cash and cash equivalents	694,913	1,627,807
Trading security	6,812	8,354
Marketable equity securities	12,790	15,453
Securities available for sale, at fair value	1,470,949	1,877,585
Securities held to maturity	592,503	636,503
FHLB bank stock and restricted securities	7,264	10,800
Net loans	7,847,468	6,719,753
Loans held for sale	4,124	6,110
Accrued interest receivable	40,444	33,534
Derivative assets	53,019	79,528
Financial Liabilities
Total deposits	9,988,121	10,068,953
Short-term debt	0	0
Long-term Federal Home Loan Bank advances and other	4,494	13,331
Subordinated borrowings	121,001	97,513
Derivative liabilities	101,745	35,194
Fair Value
Financial Assets
Cash and cash equivalents	694,913	1,627,807
Trading security	6,812	8,354
Marketable equity securities	12,790	15,453
Securities available for sale, at fair value	1,470,949	1,877,585
Securities held to maturity	503,262	647,236
Net loans	7,798,562	6,850,975
Loans held for sale	4,124	6,110
Accrued interest receivable	40,444	33,534
Derivative assets	53,019	79,528
Financial Liabilities
Total deposits	9,944,085	10,073,217
Short-term debt	0	0
Long-term Federal Home Loan Bank advances and other	2,888	13,053
Subordinated borrowings	110,109	95,006
Derivative liabilities	$ 101,745	$ 35,194

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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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Amount excluding accrued interest, 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 deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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

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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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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) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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