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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Commercial Credit Exposure (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial Loans 100.00% 100.00%  
Acquired nonimpaired loans $ 465,438 $ 565,500 $ 596,466
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 1,506,675 1,464,554  
Acquired nonimpaired loans 97,552   120,987
Special mention | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 21,315 22,789  
Accrual | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 17,247 34,332  
Nonaccrual | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 15,158 15,370  
Doubtful | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 3,970 $ 3,687  
Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial Loans 3.00% 3.00%  
Total Special Mention and Substandard | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 57,690 $ 76,178  
Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial Loans 1.00% 1.00%  
Acquired impaired | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 2,070 $ 4,156  
Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial Loans 96.00% 96.00%  
Pass | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 1,446,915 $ 1,384,220  
Owner-occupied commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 1,085,404 1,079,247  
Acquired nonimpaired loans 119,403   144,710
Owner-occupied commercial | Special mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 32,123 16,783  
Owner-occupied commercial | Accrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 24,662 19,386  
Owner-occupied commercial | Nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 2,820 3,654  
Owner-occupied commercial | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 9 0  
Owner-occupied commercial | Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 59,614 39,823  
Owner-occupied commercial | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 4,816 5,803  
Owner-occupied commercial | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 1,020,974 1,033,621  
Commercial mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 1,133,281 1,187,705  
Acquired nonimpaired loans 156,483   194,394
Commercial mortgages | Special mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 10,806 0  
Commercial mortgages | Accrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 1,546 1,967  
Commercial mortgages | Nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 6,209 5,852  
Commercial mortgages | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 0 18  
Commercial mortgages | Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 18,561 7,837  
Commercial mortgages | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 8,951 9,724  
Commercial mortgages | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 1,105,769 1,170,144  
Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 333,487 281,608  
Acquired nonimpaired loans 7,025   $ 19,085
Construction | Special mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 0 0  
Construction | Accrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 169 4,965  
Construction | Nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 2,460 1,804  
Construction | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 444 0  
Construction | Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 3,073 6,769  
Construction | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 737 940  
Construction | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 329,677 273,899  
Total Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 4,058,847 4,013,114  
Acquired nonimpaired loans 380,500 457,300  
Total Commercial | Special mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 64,244 39,572  
Total Commercial | Accrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 43,624 60,650  
Total Commercial | Nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 26,647 26,680  
Total Commercial | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 4,423 3,705  
Total Commercial | Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 138,938 130,607  
Total Commercial | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 16,574 20,623  
Total Commercial | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 3,903,335 $ 3,861,884