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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial assets    
Investment securities held-to-maturity $ 142,862 $ 429,328
Other investments 125,020 115,660
Deposits    
Noninterest-bearing 2,643,928 2,492,434
Savings 2,960,979 3,167,325
Time 2,240,441 2,173,564
Deposits 10,210,229 10,140,394
Carrying value    
Financial assets    
Cash and short-term investments 257,639 273,959
Investment securities held-to-maturity 142,862 429,328
Other investments 125,020 115,660
Loans held for sale 13,680 4,372
Loans and leases 9,144,015 8,767,672
Interest Receivable 39,591 41,816
Deposits    
Deposits 10,210,229 10,140,394
Short-term borrowings 1,316,181 1,040,691
Long-term debt 414,376 570,739
Interest Payable 13,671 12,126
Fair value    
Financial assets    
Cash and short-term investments 257,639 273,959
Investment securities held-to-maturity 142,821 424,118
Loans held for sale 13,680 4,372
Loans and leases 9,134,215 8,662,868
Interest Receivable 39,591 41,816
Deposits    
Deposits 10,209,790 10,113,475
Short-term borrowings 1,316,181 1,040,691
Long-term debt 414,937 557,933
Interest Payable 13,671 12,126
Fair Value, Inputs, Level 1 [Member] | Fair value    
Financial assets    
Cash and short-term investments 257,639 273,959
Investment securities held-to-maturity 0 0
Loans held for sale 0 0
Loans and leases 0 0
Interest Receivable 0 0
Deposits    
Deposits 0 0
Short-term borrowings 1,316,181 1,040,691
Long-term debt 0 0
Interest Payable 1,899 2,035
Fair Value, Inputs, Level 2 [Member] | Fair value    
Financial assets    
Cash and short-term investments 0 0
Investment securities held-to-maturity 142,821 424,118
Loans held for sale 13,680 4,372
Loans and leases 0 0
Interest Receivable 12,743 13,819
Deposits    
Deposits 10,209,790 10,113,475
Short-term borrowings 0 0
Long-term debt 414,937 557,933
Interest Payable 11,772 10,091
Fair Value, Inputs, Level 3 [Member] | Fair value    
Financial assets    
Cash and short-term investments 0 0
Investment securities held-to-maturity 0 0
Loans held for sale 0 0
Loans and leases 9,134,215 8,662,868
Interest Receivable 26,848 27,997
Deposits    
Deposits 0 0
Short-term borrowings 0 0
Long-term debt 0 0
Interest Payable $ 0 $ 0