LOANS AND ALLOWANCE FOR LOAN LOSSES- Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 2,899,037	$ 1,393,321
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,985	8,916
Related Allowance	390	652
Unpaid Principal Balance	15,802	10,229
Non-PCI Loans | With Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,472	1,402
Non-PCI Loans | With No Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,513	7,514
Non-PCI Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,398	4,590
Related Allowance	158	57
Unpaid Principal Balance	5,330	5,257
Non-PCI Loans | Commercial real estate | With Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	885	732
Non-PCI Loans | Commercial real estate | With No Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,513	3,858
Non-PCI Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,343	343
Related Allowance	229	323
Unpaid Principal Balance	2,718	343
Non-PCI Loans | Commercial and industrial | With Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	525	323
Non-PCI Loans | Commercial and industrial | With No Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,818	20
Non-PCI Loans | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	910	2,609
Related Allowance	0	0
Unpaid Principal Balance	1,971	3,042
Non-PCI Loans | Commercial construction | With Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Non-PCI Loans | Commercial construction | With No Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	910	2,609
Non-PCI Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	928	695
Related Allowance	0	0
Unpaid Principal Balance	3,863	877
Non-PCI Loans | Residential real estate | With Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Non-PCI Loans | Residential real estate | With No Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	928	695
Non-PCI Loans | Construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		242
Related Allowance		0
Unpaid Principal Balance		255
Non-PCI Loans | Construction and development | With Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		0
Non-PCI Loans | Construction and development | With No Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		242
Non-PCI Loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	406	424
Related Allowance	3	270
Unpaid Principal Balance	1,920	442
Non-PCI Loans | Home equity | With Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	62	334
Non-PCI Loans | Home equity | With No Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	344	90
Non-PCI Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		13
Related Allowance		2
Unpaid Principal Balance		13
Non-PCI Loans | Other consumer | With Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		13
Non-PCI Loans | Other consumer | With No Related Allowance Recorded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		$ 0