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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% |

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- Definition Amount of servicing loans in which company is participating in service the loans, collects payments from the borrowers and remits payments net of servicing fees. + References No definition available. + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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- Definition Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4437-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5162-111524 + Details
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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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