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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Notional Amount $ 4,070,729 $ 3,303,570
Estimated Fair Value Asset (Liability) (492) 1,680
Economic hedges | Interest rate swap | Tax advantaged economic development bonds    
Offsetting Assets [Line Items]    
Notional Amount 9,400  
Hedging derivatives | Economic hedges    
Offsetting Assets [Line Items]    
Notional Amount 3,901,732 3,138,491
Estimated Fair Value Asset (Liability) (3,120) (2,247)
Hedging derivatives | Economic hedges | Interest rate swap    
Offsetting Assets [Line Items]    
Notional Amount 3,300,000  
Hedging derivatives | Economic hedges | Interest rate swap | Tax advantaged economic development bonds    
Offsetting Assets [Line Items]    
Notional Amount $ 9,390 $ 10,090
Weighted Average Maturity 9 years 10 months 24 days 10 years 10 months 24 days
Derivative, weighted average rate, received (percent) 2.08% 2.72%
Derivative, weighted average rate, contract pay rate (percent) 5.09% 5.09%
Estimated Fair Value Asset (Liability) $ (1,488) $ (1,240)
Hedging derivatives | Economic hedges | Interest rate swap | Commercial loan    
Offsetting Assets [Line Items]    
Notional Amount $ 1,669,895 $ 1,346,894
Weighted Average Maturity 6 years 4 months 24 days 6 years 8 months 12 days
Derivative, weighted average rate, received (percent) 4.38% 4.53%
Derivative, weighted average rate, contract pay rate (percent) 3.28% 4.04%
Estimated Fair Value Asset (Liability) $ 75,326 $ 11,443
Hedging derivatives | Economic hedges | Reverse interest rate swaps | Commercial loan    
Offsetting Assets [Line Items]    
Notional Amount $ 1,669,895 $ 1,346,894
Weighted Average Maturity 6 years 4 months 24 days 6 years 8 months 12 days
Derivative, weighted average rate, received (percent) 3.28% 4.04%
Derivative, weighted average rate, contract pay rate (percent) 4.38% 4.53%
Estimated Fair Value Asset (Liability) $ (77,051) $ (11,953)
Hedging derivatives | Economic hedges | Risk participation agreements    
Offsetting Assets [Line Items]    
Notional Amount $ 315,140 $ 243,806
Weighted Average Maturity 7 years 6 months 5 years 8 months 12 days
Estimated Fair Value Asset (Liability) $ 320 $ 237
Hedging derivatives | Economic hedges | Forward Sale commitments    
Offsetting Assets [Line Items]    
Notional Amount $ 237,412 $ 190,807
Weighted Average Maturity 6 days 6 days
Estimated Fair Value Asset (Liability) $ (227) $ (734)
Non-hedging derivatives    
Offsetting Assets [Line Items]    
Notional Amount 168,997 165,079
Estimated Fair Value Asset (Liability) 2,628 3,927
Non-hedging derivatives | Commitments to Lend    
Offsetting Assets [Line Items]    
Notional Amount $ 168,997 $ 165,079
Weighted Average Maturity 6 days 6 days
Estimated Fair Value Asset (Liability) $ 2,628 $ 3,927