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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Loans and Lease Acquired through Acquisition (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding unpaid principal balance at acquisition	$ 571,245	$ 0	$ 485,066
Cash flows expected to be collected at acquisitions	667,224	0	504,197
Fair value of acquired loans at acquisition	529,178	0	348,569
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding unpaid principal balance at acquisition	0	0	2,721
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding unpaid principal balance at acquisition	0	0	3,226
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding unpaid principal balance at acquisition	0	0	4,333
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding unpaid principal balance at acquisition	571,245	0	473,942
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding unpaid principal balance at acquisition	$ 0	$ 0	$ 844

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Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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