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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financial assets    
Investment securities held-to-maturity $ 121,945 $ 131,687
Other investments 131,814 133,198
Loans held for sale 34,600 41,100
Interest Receivable 38,221  
Deposits    
Noninterest-bearing 3,995,370 3,763,709
Savings 4,006,181 3,680,774
Time 1,731,757 1,872,733
Impaired Commercial And Commercial Real Estate Loans Member    
Deposits    
Principal Amount of Commercial and Commercial Real Estate Loans 30,900 45,300
Carrying value    
Financial assets    
Cash and short-term investments 229,371 251,359
Investment securities held-to-maturity 121,945 131,687
Other investments 131,814 133,198
Loans and leases 9,764,046 9,725,291
Interest Receivable 51,520 50,903
Deposits    
Deposits 12,648,069 12,232,003
Short-term borrowings 181,387 166,594
Long-term debt 583,722 776,202
Interest Payable 5,723 6,240
Fair value    
Financial assets    
Cash and short-term investments 229,371 251,359
Investment securities held-to-maturity 124,294 136,698
Other investments 131,814 133,198
Loans and leases 9,767,354 9,743,497
Interest Receivable 51,520 50,903
Deposits    
Deposits 12,652,266 12,238,058
Short-term borrowings 181,387 166,594
Long-term debt 581,177 774,674
Interest Payable 5,723 6,240
Fair Value, Inputs, Level 1 [Member] | Fair value    
Financial assets    
Cash and short-term investments 229,371 251,359
Investment securities held-to-maturity 0 0
Other investments 949 837
Loans and leases 0 0
Interest Receivable 0 0
Deposits    
Deposits 0 0
Short-term borrowings 181,387 166,594
Long-term debt 0 0
Interest Payable 0 14
Fair Value, Inputs, Level 2 [Member] | Fair value    
Financial assets    
Cash and short-term investments 0 0
Investment securities held-to-maturity 124,294 136,698
Other investments 121,457 122,953
Loans and leases 0 0
Interest Receivable 13,299 13,221
Deposits    
Deposits 12,652,266 12,238,058
Short-term borrowings 0 0
Long-term debt 581,177 774,674
Interest Payable 5,723 6,226
Fair Value, Inputs, Level 3 [Member] | Fair value    
Financial assets    
Cash and short-term investments 0 0
Investment securities held-to-maturity 0 0
Other investments 9,408 9,408
Loans and leases 9,767,354 9,743,497
Interest Receivable   37,682
Deposits    
Deposits 0 0
Short-term borrowings 0 0
Long-term debt 0 0
Interest Payable $ 0 $ 0