13. ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Component of accumulated other comprehensive (loss) income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014 Net Unrealized Gains (Losses) on Securities	Jun. 30, 2013 Net Unrealized Gains (Losses) on Securities	Jun. 30, 2014 Net Unrealized Gains (Losses) on Securities	Jun. 30, 2013 Net Unrealized Gains (Losses) on Securities	Jun. 30, 2014 Adjustments Related to Defined Benefit Pension Plan	Jun. 30, 2013 Adjustments Related to Defined Benefit Pension Plan	Jun. 30, 2014 Adjustments Related to Defined Benefit Pension Plan	Jun. 30, 2013 Adjustments Related to Defined Benefit Pension Plan	Jun. 30, 2014 Accumulated Other Comprehensive (Loss) Income	Jun. 30, 2013 Accumulated Other Comprehensive (Loss) Income	Jun. 30, 2014 Accumulated Other Comprehensive (Loss) Income	Jun. 30, 2013 Accumulated Other Comprehensive (Loss) Income
Accumulated other comprehensive loss, net of tax, beginning	$ (2,547)	$ 2,585	$ (3,734)	$ 3,287	$ (1,308)	$ (1,478)	$ (1,286)	$ (1,621)	$ (3,855)	$ 1,107	$ (5,020)	$ 1,666
Net unrealized gain on securities available for sale, net of tax	1,976	(5,823)	3,163	(6,205)	0	0	0	0	1,976	(5,823)	3,163	(6,205)
Reclassification adjustment for gains on securities, net of tax	(33)	0	(33)	(320)	0	0	0	0	(33)	0	(33)	(320)
Net loss arising during the period, net of tax	0	0	0	0	(64)	577	(122)	676	(64)	577	(122)	676
Reclassification adjustment for amortization of prior service cost and net gain included in salaries and employee benefits, net of tax	0	0	0	0	35	44	71	88	35	44	71	88
Accumulated other comprehensive loss, net of tax, ending	$ (604)	$ (3,238)	$ (604)	$ (3,238)	$ (1,337)	$ (857)	$ (1,337)	$ (857)	$ (1,941)	$ (4,095)	$ (1,941)	$ (4,095)