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FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—trading | $ 25,268 | $ 28,694
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 2,287,993 | 2,789,031
Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Held-for-sale, Fair Value Disclosure | 51,697 | 51,779
Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 2,287,993 | 2,789,031
Total assets | 2,363,152 | 2,853,326
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 66,284 | 74,857
Total liabilities | 112,266 | 112,192
Recurring [Member] | Interest rate swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 23,809 | 19,339
Derivative liabilities | 45,938 | 37,150
Recurring [Member] | Interest rate lock and forward sale commitments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 338 | 142
Derivative liabilities | 25 | 118
Recurring [Member] | Loan Participations and Assignments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 19 | 67
Recurring [Member] | Trust Preferred Securities Subject to Mandatory Redemption |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—trading | 25,268 | 28,694
Recurring [Member] | U.S. Government and agency obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 34,327 | 55,108
Recurring [Member] | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 123,598 | 261,209
Recurring [Member] | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 91,018 | 121,853
Recurring [Member] | Mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 1,819,452 | 2,139,336
Recurring [Member] | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 219,598 | 211,525
Recurring [Member] | Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Held-for-sale, Fair Value Disclosure | 11,634 | 2,305
Recurring [Member] | Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 552 | 553
Recurring [Member] | SBA Servicing Asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
SBA servicing asset | 717 | 835
Recurring [Member] | Investment in Limited Partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in limited partnerships | 12,841 | 12,427
Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Total assets | 552 | 553
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 0 | 0
Total liabilities | 0 | 0
Recurring [Member] | Level 1 [Member] | Interest rate swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring [Member] | Level 1 [Member] | Interest rate lock and forward sale commitments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring [Member] | Level 1 [Member] | Loan Participations and Assignments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0 | 0
Recurring [Member] | Level 1 [Member] | Trust Preferred Securities Subject to Mandatory Redemption |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—trading | 0 | 0
Recurring [Member] | Level 1 [Member] | U.S. Government and agency obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Level 1 [Member] | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Level 1 [Member] | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Level 1 [Member] | Mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Level 1 [Member] | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Level 1 [Member] | Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Held-for-sale, Fair Value Disclosure | 0 | 0
Recurring [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 552 | 553
Recurring [Member] | Level 1 [Member] | SBA Servicing Asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
SBA servicing asset | 0 | 0
Recurring [Member] | Level 1 [Member] | Investment in Limited Partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in limited partnerships | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 2,287,993 | 2,789,031
Total assets | 2,323,672 | 2,810,736
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 0 | 0
Total liabilities | 45,957 | 37,293
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 23,809 | 19,339
Derivative liabilities | 45,938 | 37,150
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate lock and forward sale commitments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 236 | 61
Derivative liabilities | 0 | 76
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loan Participations and Assignments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 19 | 67
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Trust Preferred Securities Subject to Mandatory Redemption |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—trading | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government and agency obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 34,327 | 55,108
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 123,598 | 261,209
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 91,018 | 121,853
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 1,819,452 | 2,139,336
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 219,598 | 211,525
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Held-for-sale, Fair Value Disclosure | 11,634 | 2,305
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SBA Servicing Asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
SBA servicing asset | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Investment in Limited Partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in limited partnerships | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Held-For-Sale, Fair Value Disclosure, Unpaid Principal Balance | 11,500 | 2,200
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Total assets | 38,928 | 42,037
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 66,284 | 74,857
Total liabilities | 66,309 | 74,899
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate lock and forward sale commitments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 102 |
Derivative liabilities | 25 | 42
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Loan Participations and Assignments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Trust Preferred Securities Subject to Mandatory Redemption |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—trading | 25,268 | 28,694
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Government and agency obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans Held-for-sale, Fair Value Disclosure | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | SBA Servicing Asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
SBA servicing asset | 717 | 835
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Investment in Limited Partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in limited partnerships | $ 12,841 | $ 12,427

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- Definition 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. 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