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PREMISES, EQUIPMENT, AND CAPITAL LEASES, NET - Additional Information (Details) |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 30, 2017 USD ($) | May 05, 2016 USD ($) | Nov. 12, 2015 USD ($) | Sep. 25, 2015 USD ($) Branch | Jun. 25, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Branch
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of branch locations sold | Branch |  |  |  |  |  |  |  | 2
Proceeds from sale of premises and equipment |  |  |  |  |  | $ 2,663,000 | $ 28,000 | $ 50,639,000
Gain on sale of property |  |  |  |  |  | (1,070,000) | (122,000) | (80,000)
Impairment on capitalized software projects |  |  |  |  |  | 1,957,000 | 595,000 | 0
Depreciation on premises and equipment |  |  |  |  |  | 12,425,000 | 11,680,000 | 9,154,000
Capital leases |  |  |  |  |  | 1,500,000 | 1,400,000 |
Total rent expense |  |  |  |  |  | $ 11,000,000 | $ 16,800,000 | $ 16,400,000
Leasehold Improvements |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value of properties sold | $ 748,000 | $ 57,000 |  |  |  |  |  |
Furniture, fixture and equipment |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value of properties sold | $ 1,700,000 | $ 88,000 |  |  |  |  |  |
Buildings |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value of properties sold |  |  |  |  | $ 42,300,000 |  |  |
Proceeds from sale of premises and equipment |  |  |  |  | 52,300,000 |  |  |
Gain on sale of property |  |  |  |  | 9,900,000 |  |  |
Selling costs |  |  |  |  | $ 2,300,000 |  |  |
Americas United Bank (AUB) |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of branch locations sold | Branch |  |  |  | 2 |  |  |  |
Americas United Bank (AUB) | Leasehold Improvements |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value of properties sold |  |  |  | $ 47,000 |  |  |  |
Americas United Bank (AUB) | Furniture, fixture and equipment |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value of properties sold |  |  |  | $ 30,000 |  |  |  |
Banco Popular North America (BPNA) |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Improved real property purchased |  |  | $ 77,000,000 |  |  |  |  |

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