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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financial assets    
Investment securities held-to-maturity $ 112,456 $ 131,687
Other investments 129,432 133,198
Loans held for sale 31,500 41,100
Interest Receivable 34,920 37,700
Deposits    
Noninterest-bearing 3,901,691 3,763,709
Savings 4,093,229 3,680,774
Time 1,548,109 1,872,733
Impaired Commercial And Commercial Real Estate Loans Member    
Deposits    
Principal Amount of Commercial and Commercial Real Estate Loans 27,500 45,300
Carrying value    
Financial assets    
Cash and short-term investments 245,528 251,359
Investment securities held-to-maturity 112,456 131,687
Other investments 129,432 133,198
Loans and leases 9,351,920 9,725,291
Interest Receivable 48,832 50,903
Deposits    
Deposits 12,506,180 12,232,003
Short-term borrowings 472,791 166,594
Long-term debt 313,039 776,202
Interest Payable 4,521 6,240
Fair value    
Financial assets    
Cash and short-term investments 245,528 251,359
Investment securities held-to-maturity 115,171 136,698
Other investments 129,432 133,198
Loans and leases 9,409,846 9,743,497
Interest Receivable 48,832 50,903
Deposits    
Deposits 12,508,971 12,238,058
Short-term borrowings 472,791 166,594
Long-term debt 310,720 774,674
Interest Payable 4,521 6,240
Fair Value, Inputs, Level 1 [Member] | Fair value    
Financial assets    
Cash and short-term investments 245,528 251,359
Investment securities held-to-maturity 0 0
Other investments 1,110 837
Loans and leases 0 0
Interest Receivable 0 0
Deposits    
Deposits 0 0
Short-term borrowings 472,791 166,594
Long-term debt 0 0
Interest Payable 3 14
Fair Value, Inputs, Level 2 [Member] | Fair value    
Financial assets    
Cash and short-term investments 0 0
Investment securities held-to-maturity 115,171 136,698
Other investments 118,914 122,953
Loans and leases 0 0
Interest Receivable 13,912 13,221
Deposits    
Deposits 12,508,971 12,238,058
Short-term borrowings 0 0
Long-term debt 310,720 774,674
Interest Payable 4,518 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 9,409,846 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