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BUSINESS COMBINATIONS AND BRANCH SALES - Branch Sales (Details) $ in Thousands			3 Months Ended	12 Months Ended			15 Months Ended
	Sep. 25, 2015 USD ($) Branch	Oct. 04, 2013 USD ($) Branch	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) Branch	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Number of branches agreed to sell | Branch				2
Gain on sale of branches				$ 163	$ 456	$ 12,104
Proceeds from sale of loans held-for-investment				575,477	161,638	276,516
Net gain on sale of loans				$ 37,211	$ 19,828	$ 8,700
Americas United Bank (AUB)
Business Acquisition [Line Items]
Number of branches agreed to sell | Branch	2
Deposits held for sale	$ 46,900
Proceeds from sale of loans held-for-investment	40,200
Americas United Bank (AUB) | Other Income
Business Acquisition [Line Items]
Gain on sale of branches	163
Americas United Bank (AUB) | Net Gain on Sale of Loans
Business Acquisition [Line Items]
Net gain on sale of loans	$ 644
Washington state chartered bank (AWB)
Business Acquisition [Line Items]
Number of branches agreed to sell | Branch		8
Deposits held for sale		$ 464,300
Gain on sale of branches			$ 12,100				$ 12,600
Deposit premium percentage		2.30%
Number of real estate branch locations related to deposit accounts | Branch		3

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
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The cash inflow from Sales of Loans Held For Investment.

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