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LOANS - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Participating serving loans $ 459,300,000 $ 189,000,000  
Payments to acquire loans and leases held-for-investment 190,800,000 124,400,000  
Proceeds from sale of loans and leases held-for-investment 307,700,000 121,000,000  
Gain (loss) on sales of loans, net 8,000,000 6,000,000 $ 4,000,000
Loans 6,549,787,000 5,725,236,000  
Loans pledged as collateral 100,000,000    
Due to related parties 38,700,000 3,500,000  
Loans receivable, related parties 25,600,000 2,100,000  
Non-accrual loans 22,157,000 20,837,000  
Additional funds committed amount $ 0    
Borrower's sustained repayment performance period 6 months    
Acquired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 1,328,480,000 1,164,553,000  
Acquired credit impaired loans 46,800,000 21,400,000  
Non-accrual loans 5,341,000 5,353,000  
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,616,438,000 2,059,767,000  
Non-accrual loans 5,883,000 4,882,000  
Commercial real estate | Acquired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 690,094,000 425,740,000  
Acquired credit impaired loans 34,800,000 15,800,000  
Non-accrual loans 1,202,000 1,468,000  
Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,062,038,000 1,048,263,000  
Non-accrual loans 7,440,000 8,221,000  
Commercial and industrial | Acquired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 153,936,000 221,031,000  
Acquired credit impaired loans 3,400,000 2,800,000  
Non-accrual loans 1,155,000 597,000  
Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,893,131,000 1,815,035,000  
Non-accrual loans 3,795,000 3,966,000  
Repossessed assets 151,000 675,000  
Residential | Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Collateral for residential mortgage loans 4,800,000 7,500,000  
Residential | Acquired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 298,159,000 334,098,000  
Acquired credit impaired loans 7,300,000 2,600,000  
Non-accrual loans 1,572,000 1,668,000  
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 978,180,000 802,171,000  
Non-accrual loans 5,039,000 3,768,000  
Consumer | Acquired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 186,291,000 183,684,000  
Acquired credit impaired loans 1,300,000 249,000  
Non-accrual loans 1,412,000 1,620,000  
Total Loans | 6512 Operators of Nonresidential Buildings | Credit Concentration Risk      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 1,100,000,000 $ 800,000,000  
Concentration risk, percentage 16.80% 14.70%