LOANS (excluding covered loans) - Loan Delinquency, including Nonaccrual Loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, excluding covered loans	$ 3,614,203	$ 3,505,641
Non Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	13,312	13,724
60 - 89 days past due	4,182	5,591
> 90 days past due	24,701	27,862
Total Past due	42,195	47,177
Current	3,572,008	3,458,464
Total loans, excluding covered loans	3,614,203	3,505,641
> 90 days past due and still accruing	209	218
Non Covered Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	1,040	2,016
60 - 89 days past due	160	161
> 90 days past due	6,846	7,136
Total Past due	8,046	9,313
Current	1,110,011	1,026,355
Total loans, excluding covered loans	1,118,057	1,035,668
> 90 days past due and still accruing	0	0
Non Covered Loans | Real estate-construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	0
60 - 89 days past due	0	0
> 90 days past due	223	223
Total Past due	223	223
Current	87,773	80,518
Total loans, excluding covered loans	87,996	80,741
> 90 days past due and still accruing	0	0
Non Covered Loans | Real estate-commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	9,038	7,800
60 - 89 days past due	3,619	4,269
> 90 days past due	10,972	12,732
Total Past due	23,629	24,801
Current	1,490,262	1,472,186
Total loans, excluding covered loans	1,513,891	1,496,987
> 90 days past due and still accruing	0	0
Non Covered Loans | Real estate-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, excluding covered loans	360,671	352,931
Non Covered Loans | Real estate - residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	2,047	2,030
60 - 89 days past due	35	685
> 90 days past due	4,830	5,526
Total Past due	6,912	8,241
Current	353,759	344,690
Total loans, excluding covered loans	360,671	352,931
> 90 days past due and still accruing	0	0
Non Covered Loans | Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	265	213
60 - 89 days past due	84	40
> 90 days past due	216	379
Total Past due	565	632
Current	44,346	46,501
Total loans, excluding covered loans	44,911	47,133
> 90 days past due and still accruing	0	0
Non Covered Loans | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	579	985
60 - 89 days past due	112	292
> 90 days past due	1,405	1,648
Total Past due	2,096	2,925
Current	372,331	373,529
Total loans, excluding covered loans	374,427	376,454
> 90 days past due and still accruing	0	0
Non Covered Loans | All other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	343	680
60 - 89 days past due	172	144
> 90 days past due	209	218
Total Past due	724	1,042
Current	113,526	114,685
Total loans, excluding covered loans	114,250	115,727
> 90 days past due and still accruing	$ 209	$ 218