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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial assets    
Investment securities held-to-maturity $ 103,886 $ 131,687
Other investments 97,831 133,198
Loans held for sale 33,800 41,100
Interest Receivable 31,761 37,700
Deposits    
Noninterest-bearing 4,019,197 3,763,709
Savings 4,223,905 3,680,774
Time 1,517,419 1,872,733
Impaired Commercial And Commercial Real Estate Loans Member    
Deposits    
Principal Amount of Commercial and Commercial Real Estate Loans 36,600 45,300
Carrying value    
Financial assets    
Cash and short-term investments 239,547 251,359
Investment securities held-to-maturity 103,886 131,687
Other investments 97,831 133,198
Loans and leases 9,212,028 9,725,291
Interest Receivable 45,983 50,903
Deposits    
Deposits 12,677,381 12,232,003
Short-term borrowings 188,850 166,594
Long-term debt 313,230 776,202
Interest Payable 4,808 6,240
Fair value    
Financial assets    
Cash and short-term investments 239,547 251,359
Investment securities held-to-maturity 105,679 136,698
Other investments 97,831 133,198
Loans and leases 9,288,399 9,743,497
Interest Receivable 45,983 50,903
Deposits    
Deposits 12,678,535 12,238,058
Short-term borrowings 188,850 166,594
Long-term debt 310,911 774,674
Interest Payable 4,808 6,240
Fair Value, Inputs, Level 1 [Member] | Fair value    
Financial assets    
Cash and short-term investments 239,547 251,359
Investment securities held-to-maturity 0 0
Other investments 1,218 837
Loans and leases 0 0
Interest Receivable 0 0
Deposits    
Deposits 0 0
Short-term borrowings 188,850 166,594
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 105,679 136,698
Other investments 87,205 122,953
Loans and leases 0 0
Interest Receivable 14,222 13,221
Deposits    
Deposits 12,678,535 12,238,058
Short-term borrowings 0 0
Long-term debt 310,911 774,674
Interest Payable 4,808 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 9,288,399 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