MERGERS AND ACQUISITIONS - Balance Sheet - ECB Bancorp (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 15, 2014	Feb. 16, 2014	Apr. 01, 2013
Business Acquisition [Line Items]
Cash and cash equivalents	$ 65,312	$ 29,081
Investment securities available for sale	672,421	404,388
Loans, net	2,890,449	1,385,790
Foreclosed assets	12,891	10,518
Deferred tax asset, net	75,449	56,816
Accrued interest receivable and other assets	81,327	38,118
Total assets	4,266,309	2,122,713
Deposits	3,247,364	1,672,231
Short-term borrowings	250,500	126,500
Long-term debt	180,164	72,921
Accrued interest payable and other liabilities	30,479	13,002
Total liabilities	3,708,507	1,884,654
Preferred stock	28,405	0
Common stock warrants	717	0
Gain on acquisition	0	7,382	0
Minimum
Business Acquisition [Line Items]
Preferred stock, dividend rate (as a percentage)				5.00%
Maximum
Business Acquisition [Line Items]
Preferred stock, dividend rate (as a percentage)					9.00%
East Carolina Bancorp, Inc
Business Acquisition [Line Items]
Cash and cash equivalents						24,008
Investment securities available for sale						289,359
Loans held for sale						13,456
Loans, net						453,054
Federal Home Loan Bank stock, at cost						3,150
Premises and equipment						24,591
Bank-owned life insurance						12,249
Foreclosed assets						6,068
Deferred tax asset, net						16,608
Other intangible assets						4,307
Accrued interest receivable and other assets						8,836
Total assets						855,686
Deposits						736,114
Short-term borrowings						34,284
Long-term debt						16,460
Accrued interest payable and other liabilities						3,131
Total liabilities						789,989
Net assets acquired						65,697
Preferred stock						17,553
Common stock warrants						133
Total other equity interests						17,686
Gain on acquisition						7,382
Purchase price						40,629
Scenario, Previously Reported | East Carolina Bancorp, Inc
Business Acquisition [Line Items]
Cash and cash equivalents						24,008
Investment securities available for sale						289,058
Loans held for sale						3,857
Loans, net						483,474
Federal Home Loan Bank stock, at cost						3,150
Premises and equipment						25,633
Bank-owned life insurance						12,249
Foreclosed assets						7,090
Deferred tax asset, net						6,986
Other intangible assets						0
Accrued interest receivable and other assets						10,423
Total assets						865,928
Deposits						731,926
Short-term borrowings						34,284
Long-term debt						16,000
Accrued interest payable and other liabilities						2,867
Total liabilities						785,077
Net assets acquired						80,851
Preferred stock						17,660
Common stock warrants						878
Total other equity interests						18,538
Initial Fair Value Adjustments | East Carolina Bancorp, Inc
Business Acquisition [Line Items]
Cash and cash equivalents						0
Investment securities available for sale						301	[1]
Loans held for sale						9,790	[2]
Loans, net						(30,420)	[3]
Federal Home Loan Bank stock, at cost						0
Premises and equipment						(1,177)	[4]
Bank-owned life insurance						0
Foreclosed assets						(717)	[5]
Deferred tax asset, net						9,082	[6]
Other intangible assets						4,307	[7]
Accrued interest receivable and other assets						(665)	[8]
Total assets						(9,499)
Deposits						4,188	[9]
Short-term borrowings						0
Long-term debt						460	[10]
Accrued interest payable and other liabilities						148	[11]
Total liabilities						4,796
Net assets acquired						(14,295)
Preferred stock						(107)	[12]
Common stock warrants						(745)	[12]
Total other equity interests						(852)
Measurement Period Adjustment | East Carolina Bancorp, Inc
Business Acquisition [Line Items]
Cash and cash equivalents						0
Investment securities available for sale						0
Loans held for sale						(191)	[13]
Loans, net						0
Federal Home Loan Bank stock, at cost						0
Premises and equipment						135	[13]
Bank-owned life insurance						0
Foreclosed assets						(305)	[13]
Deferred tax asset, net						540	[13]
Other intangible assets						0
Accrued interest receivable and other assets						(922)	[13]
Total assets						(743)
Deposits						0
Short-term borrowings						0
Long-term debt						0
Accrued interest payable and other liabilities						116	[13]
Total liabilities						116
Net assets acquired						(859)
Preferred stock						0
Common stock warrants						0
Total other equity interests						$ 0

[1] Adjustment reflects opening fair value of securities portfolio, which was established as the new book basis of the portfolio.

[2] Adjustment reflect the reclassification of the fair value of certain loans identified by management as being held for sale at acquisition.

[3] Adjustment reflects the elimination of ECB's historical allowance for loan losses and the recording of a fair value discount on the loan portfolio. The fair value discount was calculated by forecasting cash flows over the expected remaining life of each loan and discounting those cash flows to present value using current market rates for similar loans. Forecasted cash flows include an estimate of lifetime credit losses on the loan portfolio.

[4] Adjustment reflects fair value adjustments on certain acquired branch offices as well as certain software and computer equipment.

[5] Adjustment reflects the write down of certain foreclosed assets based on current estimates of property values given current market conditions and additional discounts based on the Company's planned disposition strategy.

[6] Adjustment reflects the tax impact of acquisition accounting fair value adjustments.

[7] Adjustment reflects the fair value of the acquired core deposit intangible.

[8] Adjustment reflects the impact of fair value adjustments on other assets, which include the write down of certain unusable prepaid expenses and the elimination of accrued interest on purchased credit-impaired loans.

[9] Adjustment reflects the fair value premium on time deposits, which was calculated by discounting future contractual interest payments at a current market interest rate.

[10] Adjustment reflects the fair value premium on long-term FHLB advances, which was calculated by discounting future contractual interest payments at a current market interest rate. This fair value premium is also consistent with the prepayment penalty the FHLB would charge to terminate the advance.

[11] Adjustment reflects the impact of fair value adjustments on other liabilities, which primarily includes the accrual of a preferred stock dividend at acquisition.

[12] Amount reflects the adjustment to record other equity interests at fair value. The fair value of preferred stock issued to Treasury was estimated by discounting future contractual dividend payments at a current market interest rate for preferred stocks of issuers with similar risk. The assumed liquidation date of the preferred stock was February 15, 2014, which was the date the dividend reset from 5 to 9 percent. The fair value of the common stock warrant issued to Treasury was estimated using a Black-Scholes option pricing model assuming a warrant life through the dividend reset date.

[13] Adjustments reflect changes to acquisition date fair values of certain assets based on additional information received post-acquisition within the measurement period. Measurement period adjustments included tax-effected adjustments to reduce the fair value of a non-marketable investment, to dispose of other assets with no value at the merger, to reduce the fair value of certain distressed loans held for sale, to reduce the fair value of certain other real estate owned, to recognize a liability for outstanding ECB employee credit card balances, and to increase the fair value of a bank-owned office.