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ALLOWANCE FOR LOAN AND LEASE LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Commercial Credit Exposure (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial Loans 100.00% 100.00%  
Acquired nonimpaired loans $ 3,933,340 $ 430,000 $ 534,841
Commercial and Industrial (1)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 2,220,088 1,472,489  
Acquired nonimpaired loans 782,160   107,183
Special mention | Commercial and Industrial (1)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 8,127 8,710  
Accrual | Commercial and Industrial (1)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 54,890 37,424  
Nonaccrual | Commercial and Industrial (1)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 10,741 13,180  
Doubtful | Commercial and Industrial (1)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 4,588 $ 876  
Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial Loans 2.00% 3.00%  
Total Special Mention and Substandard | Commercial and Industrial (1)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 78,346 $ 60,190  
Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial Loans 0.00% 0.00%  
Acquired impaired | Commercial and Industrial (1)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 6,130 $ 1,531  
Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial Loans 98.00% 97.00%  
Pass | Commercial and Industrial (1)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 2,135,612 $ 1,410,768  
Owner-occupied commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 1,312,945 1,059,974  
Acquired nonimpaired loans 105,154   133,007
Owner-occupied commercial | Special mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 27,030 21,230  
Owner-occupied commercial | Accrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 23,671 21,081  
Owner-occupied commercial | Nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 5,384 4,406  
Owner-occupied commercial | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 0 0  
Owner-occupied commercial | Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 56,085 46,717  
Owner-occupied commercial | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 4,070 4,248  
Owner-occupied commercial | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 1,252,790 1,009,009  
Commercial mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 2,353,152 1,162,739  
Acquired nonimpaired loans 1,575,527   178,518
Commercial mortgages | Special mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 0 0  
Commercial mortgages | Accrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 10,422 9,767  
Commercial mortgages | Nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 3,869 3,951  
Commercial mortgages | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 0 0  
Commercial mortgages | Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 14,291 13,718  
Commercial mortgages | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 19,715 7,504  
Commercial mortgages | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 2,319,146 1,141,517  
Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 575,697 316,566  
Acquired nonimpaired loans 225,245   $ 15,259
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 1,309 168  
Construction | Nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 2,414 2,337  
Construction | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 367 444  
Construction | Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 4,090 2,949  
Construction | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 636 749  
Construction | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 570,971 312,868  
Total Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 6,461,882 4,011,768  
Acquired nonimpaired loans 2,700,000 350,500  
Total Commercial | Special mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 35,157 29,940  
Total Commercial | Accrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 90,292 68,440  
Total Commercial | Nonaccrual      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 22,408 23,874  
Total Commercial | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 4,955 1,320  
Total Commercial | Total Special Mention and Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 152,812 123,574  
Total Commercial | Acquired impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans 30,551 14,032  
Total Commercial | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Commercial Loans $ 6,278,519 $ 3,874,162