FAIR VALUE - Fair Value Measurements for Items Measured at Fair Value (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale		$ 19,867	$ 23,998
Other real estate owned		8,091	7,039
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	[1]	905,182	790,766
Loans held for sale	[2]	19,867	23,998
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	[1]	100	225
Loans held for sale	[2]	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	[1]	905,082	790,541
Loans held for sale	[2]	19,867	23,998
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	[1]	0	0
Loans held for sale	[2]	0	0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	[3]	5,529	7,511
Other real estate owned	[4]	8,091	7,039
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	[3]	0	0
Other real estate owned	[4]	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	[3]	4,671	6,052
Other real estate owned	[4]	609	598
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	[3]	858	1,459
Other real estate owned	[4]	$ 7,482	$ 6,441

[1] See Note D for further detail of fair value of individual investment categories.

[2] Recurring fair value basis determined using observable market data.

[3] See Note F for nonrecurring fair value adjustments to loans identified as impaired reflect full or partial write-downs that are based on the loan’s observable market price or current appraised value of the collateral in accordance with ASC 310.

[4] Fair value is measured on a nonrecurring basis in accordance with ASC 360.