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BUSINESS COMBINATIONS AND BRANCH SALES - Private Bank of California Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2013 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 30,143 | $ 39,244 | $ 31,591 | $ 7,048
Series A Preferred Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Preferred stock, shares outstanding |  |  | 32,000 | 32,000 |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |  | $ 1,000 | $ 1,000 |
Preferred stock, shares issued | 32,000 |  | 32,000 | 32,000 |
Core deposit intangibles | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization period of other intangible assets |  |  | 4 years |  |
Core deposit intangibles | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization period of other intangible assets |  |  | 10 years |  |
Private Bank of California |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares paid as merger consideration | 2,082,654 |  |  |  |
Value of shares paid as merger consideration | $ 28,300 |  |  |  |
Per share closing price of common stock | $ 13.58 |  |  |  |
Cash paid as merger consideration | $ 25,400 |  |  |  |
Option payout | 2,700 |  |  |  |
Replacement awards | 30 |  |  |  |
Direct acquisition costs |  | $ 2,600 |  |  |
Goodwill | 15,126 |  |  |  |
Other intangible assets | $ 10,400 |  |  |  |
Private Bank of California | Core deposit intangibles | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization period of other intangible assets | 2 years |  |  |  |
Private Bank of California | Core deposit intangibles | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization period of other intangible assets | 7 years |  |  |  |
Private Bank of California | Common Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash received per share | $ 6.52 |  |  |  |
Shares received conversion ratio | 0.5379 |  |  |  |
Private Bank of California | Preferred Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares received conversion ratio | 1 |  |  |  |
Private Bank of California |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Preferred stock, shares outstanding | 10,000 |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |  |  |  |

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