FAIR VALUE - Fair Value Measurements for Items Measured at Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member]		Mar. 31, 2013 Fair Value, Measurements, Recurring [Member]		Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member]		Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member]		Mar. 31, 2014 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Measurements, Recurring [Member]		Mar. 31, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Measurements, Recurring [Member]		Mar. 31, 2014 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Measurements, Nonrecurring [Member]		Mar. 31, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Measurements, Nonrecurring [Member]		Mar. 31, 2014 Significant Other Observable Inputs (Level 2) [Member] Fair Value, Measurements, Recurring [Member]		Mar. 31, 2013 Significant Other Observable Inputs (Level 2) [Member] Fair Value, Measurements, Recurring [Member]		Mar. 31, 2014 Significant Other Observable Inputs (Level 2) [Member] Fair Value, Measurements, Nonrecurring [Member]		Mar. 31, 2013 Significant Other Observable Inputs (Level 2) [Member] Fair Value, Measurements, Nonrecurring [Member]		Mar. 31, 2014 Significant Unobservable Inputs (Level 3) [Member] Fair Value, Measurements, Recurring [Member]		Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Fair Value, Measurements, Recurring [Member]		Mar. 31, 2014 Significant Unobservable Inputs (Level 3) [Member] Fair Value, Measurements, Nonrecurring [Member]		Mar. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities			$ 658,512	[1]	$ 649,196	[1]					$ 100	[1]	$ 1,202	[1]					$ 658,412	[1]	$ 647,994	[1]					$ 0	[1]	$ 0	[1]
Loans available for sale			11,038	[2]	24,206	[2]					0	[2]	0	[2]					11,038	[2]	24,206	[2]					0	[2]	0	[2]
Loans							20,659	[3]	22,601	[3]					0	[3]	0	[3]					10,104	[3]	10,889	[3]					1,055	[3]	11,712	[3]
Other real estate owned	$ 6,369	$ 6,860					$ 6,369	[4]	$ 10,850	[4]					$ 0	[4]	$ 0	[4]					$ 883	[4]	$ 3,389	[4]					$ 5,486	[4]	$ 7,461	[4]

[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. 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.