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FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—trading $ 27,354 $ 26,981    
Securities—available-for-sale 3,147,547 3,638,993    
Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held-for-sale, Fair Value Disclosure 61,759 39,775    
Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 3,147,547 3,638,993    
Total assets 3,222,575 3,739,548    
Junior subordinated debentures net of unamortized deferred issuance costs at fair value 70,510 119,815    
Total liabilities 89,946 131,570    
Recurring [Member] | Interest rate swaps [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 14,685 20,826    
Derivative liabilities 18,574 11,336    
Recurring [Member] | Interest rate swaps [Member] | Cash Flow Hedging        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative liabilities 502 279    
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 3,062 1,555    
Derivative liabilities 142 140    
Recurring [Member] | Loan Participations and Assignments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative liabilities 218      
Recurring [Member] | TPS and TRUP CDOs [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—trading 27,354 26,981    
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 194,194 201,332    
Recurring [Member] | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 272,264 308,612    
Recurring [Member] | Corporate bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 117,583 117,347    
Recurring [Member] | Mortgage-backed securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 2,357,833 2,805,268    
Recurring [Member] | Asset-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 205,673 206,434    
Recurring [Member] | Loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans Held-for-sale, Fair Value Disclosure 16,890 39,775    
Recurring [Member] | Securities (Assets) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 893      
Recurring [Member] | SBA Servicing Asset        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
SBA servicing asset 1,162 1,161    
Recurring [Member] | Investment in Limited Partnerships        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in limited partnerships 10,982 10,257    
Recurring [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Total assets 893 0    
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 swaps [Member] | Cash Flow Hedging        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
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      
Recurring [Member] | Level 1 [Member] | TPS and TRUP CDOs [Member]        
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 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 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 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 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 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] | Securities (Assets) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 893      
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 3,147,547 3,638,993    
Total assets 3,182,184 3,699,682    
Junior subordinated debentures net of unamortized deferred issuance costs at fair value 0 0    
Total liabilities 19,370 11,755    
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 14,685 20,826    
Derivative liabilities 18,574 11,336    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Cash Flow Hedging        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative liabilities 502 279    
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 3,062 88    
Derivative liabilities 76 140    
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 218      
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | TPS and TRUP CDOs [Member]        
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 194,194 201,332    
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 272,264 308,612    
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 117,583 117,347    
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 2,357,833 2,805,268    
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 205,673 206,434    
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 16,890 39,775    
Loans Held-for-sale, unpaid principal balance 17,200 38,600    
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Securities (Assets) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 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 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—available-for-sale 0 0    
Total assets 39,498 39,866    
Junior subordinated debentures net of unamortized deferred issuance costs at fair value 70,510 119,815    
Total liabilities 70,576 119,815    
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 swaps [Member] | Cash Flow Hedging        
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] | Interest rate lock and forward sale commitments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 0 1,467 $ 9,651 $ 5,221
Derivative liabilities 66 0    
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      
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | TPS and TRUP CDOs [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities—trading 27,354 26,981    
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 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 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 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 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 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] | Securities (Assets) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 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 1,162 1,161    
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 $ 10,982 $ 10,257