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FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Financial Instruments, Liabilities, Fair Value Disclosure $ 13,078 $ 12,587
Financial assets    
Investment securities held-to-maturity 669,816 763,254
Other investments 53,198 51,077
FDIC indemnification asset 8,200 12,000
Deposits    
Noninterest-bearing 1,585,396 1,547,985
Savings 2,434,086 2,142,189
Time 1,188,597 1,321,843
Carrying value    
Financial assets    
Cash and short-term investments 152,627 204,048
Investment securities held-to-maturity 669,816 763,254
Other investments 53,198 51,077
Loans held for sale 16,466 13,135
Loans and leases, net of ALLL 5,922,503 5,699,521
FDIC indemnification asset 8,177 12,017
Interest Receivable 22,452 18,503
Deposits    
Deposits 6,726,090 6,525,788
Short-term borrowings 863,732 807,912
Long-term debt 119,615 119,589
Interest Payable 3,997 5,049
Fair value    
Financial assets    
Cash and short-term investments 152,627 204,048
Investment securities held-to-maturity 672,236 763,575
Loans held for sale 16,466 13,135
Loans and leases, net of ALLL 5,946,969 5,754,845
FDIC indemnification asset 4,608 6,720
Interest Receivable 22,452 18,503
Deposits    
Deposits 6,720,651 6,520,278
Short-term borrowings 863,732 807,912
Long-term debt 118,922 117,878
Interest Payable 3,997 5,049
Fair Value, Inputs, Level 1 [Member] | Fair value    
Financial assets    
Cash and short-term investments 152,627 204,048
Investment securities held-to-maturity 0 0
Loans held for sale 0 0
Loans and leases, net of ALLL 0 0
FDIC indemnification asset 0 0
Interest Receivable 0 0
Deposits    
Deposits 0 0
Short-term borrowings 863,732 807,912
Long-term debt 0 0
Interest Payable 957 410
Fair Value, Inputs, Level 2 [Member] | Fair value    
Financial assets    
Cash and short-term investments 0 0
Investment securities held-to-maturity 672,236 763,575
Loans held for sale 16,466 13,135
Loans and leases, net of ALLL 0 0
FDIC indemnification asset 0 0
Interest Receivable 7,883 5,705
Deposits    
Deposits 6,720,651 6,520,278
Short-term borrowings 0 0
Long-term debt 118,922 117,878
Interest Payable 3,040 4,639
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, net of ALLL 5,946,969 5,754,845
FDIC indemnification asset 4,608 6,720
Interest Receivable 14,569 12,798
Deposits    
Deposits 0 0
Short-term borrowings 0 0
Long-term debt 0 0
Interest Payable $ 0 $ 0