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BUSINESS COMBINATIONS AND TRANSACTIONS - Narrative (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 03, 2015 Branch | Nov. 08, 2014 USD ($) Branch | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Jan. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 31,591 |  | $ 31,591 |  | $ 31,591 |
Proceeds from sale of property |  |  |  |  | 52,250 | $ 0 |  |
Gain on sale of building |  |  | 9,919 | $ 0 | 9,919 | $ 0 |  |
Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of branches sold | Branch | 2 |  |  |  |  |  |  |
Americas United Bank | Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of branches sold | Branch | 2 |  |  |  |  |  |  |
Building |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  | 52,300 |  |  |  |  |
Gain on sale of building |  |  | 9,900 |  |  |  |  |
Carrying value of property |  |  | 42,300 |  | $ 42,300 |  |  |
Building | Professional Fees and All Other Expenses |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Selling costs |  |  | $ 2,300 |  |  |  |  |
Banco Popular Branches |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of branches | Branch |  | 20 |  |  |  |  |  |
Payments to acquire businesses, deposit premiums received |  | $ 3,900 |  |  |  |  |  |
Payments to acquire businesses, net of deposit premiums received |  | 24,000 |  |  |  |  |  |
Loans and leases receivable |  | 1,072,449 |  |  |  |  |  |
Deposit liabilities |  | 1,076,614 |  |  |  |  |  |
Other intangible assets |  | 15,777 |  |  |  |  |  |
Direct acquisition costs |  |  |  |  |  |  | $ 4,300 |
Goodwill |  | 0 |  |  |  |  |  |
Banco Popular Branches | Core deposit intangibles |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Other intangible assets |  | $ 15,777 |  |  |  |  |  |
Amortization period of other intangible assets |  | 10 years |  |  |  |  |  |
Renovation Ready |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Loans and leases receivable |  |  |  |  |  |  |  | $ 0
Deposit liabilities |  |  |  |  |  |  |  | 0
Other intangible assets |  |  |  |  |  |  |  | 761
Goodwill |  |  |  |  |  |  |  | $ 2,239

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