LOANS AND LEASES, Impaired (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	$ 137,791,000	$ 156,728,000
Unpaid Balance of Impaired Loans	183,440,000	206,072,000
Related Allowance for Credit Losses	11,658,000	10,541,000
Average Recorded Investment	146,810,000	196,921,000
Interest Income Recognized	231,000	1,550,000
Impaired loans [Abstract]
Impaired loans that were characterized as troubled debt restructurings	39,500,000	47,300,000
Construction, acquisition and development [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	45,816,000	61,335,000
Unpaid Balance of Impaired Loans	65,121,000	85,588,000
Related Allowance for Credit Losses	5,864,000	4,350,000
Average Recorded Investment	51,841,000	99,667,000
Interest Income Recognized	80,000	701,000
Construction, acquisition and development [Member] | Multi-family construction collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	0	0
Unpaid Balance of Impaired Loans	0	0
Related Allowance for Credit Losses	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Construction, acquisition and development [Member] | One-to-four family construction collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	7,013,000	9,605,000
Unpaid Balance of Impaired Loans	10,781,000	15,061,000
Related Allowance for Credit Losses	94,000	290,000
Average Recorded Investment	7,653,000	12,164,000
Interest Income Recognized	11,000	82,000
Construction, acquisition and development [Member] | Recreation and all other loans collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	938,000	1,117,000
Unpaid Balance of Impaired Loans	1,156,000	1,335,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	1,052,000	692,000
Interest Income Recognized	1,000	5,000
Construction, acquisition and development [Member] | Commercial construction collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	3,209,000	5,714,000
Unpaid Balance of Impaired Loans	3,869,000	6,646,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	4,763,000	4,840,000
Interest Income Recognized	10,000	66,000
Construction, acquisition and development [Member] | Commercial acquisition and development collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	11,871,000	15,464,000
Unpaid Balance of Impaired Loans	13,250,000	17,746,000
Related Allowance for Credit Losses	467,000	563,000
Average Recorded Investment	13,036,000	21,351,000
Interest Income Recognized	18,000	137,000
Construction, acquisition and development [Member] | Residential acquisition and development collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	22,785,000	29,435,000
Unpaid Balance of Impaired Loans	36,065,000	44,800,000
Related Allowance for Credit Losses	5,303,000	3,497,000
Average Recorded Investment	25,337,000	60,620,000
Interest Income Recognized	40,000	411,000
Commercial and industrial segment [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	3,459,000	4,845,000
Unpaid Balance of Impaired Loans	5,174,000	6,457,000
Related Allowance for Credit Losses	763,000	1,241,000
Average Recorded Investment	4,106,000	8,147,000
Interest Income Recognized	0	50,000
Real estate segment [Member] | Consumer mortgages [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	16,480,000	15,107,000
Unpaid Balance of Impaired Loans	20,958,000	19,378,000
Related Allowance for Credit Losses	1,962,000	1,103,000
Average Recorded Investment	15,435,000	22,085,000
Interest Income Recognized	18,000	165,000
Real estate segment [Member] | Home equity [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	2,037,000	1,380,000
Unpaid Balance of Impaired Loans	2,181,000	1,524,000
Related Allowance for Credit Losses	32,000	111,000
Average Recorded Investment	1,767,000	1,427,000
Interest Income Recognized	3,000	11,000
Real estate segment [Member] | Agricultural [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	4,844,000	5,382,000
Unpaid Balance of Impaired Loans	5,332,000	7,239,000
Related Allowance for Credit Losses	215,000	92,000
Average Recorded Investment	4,936,000	4,995,000
Interest Income Recognized	4,000	20,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	14,218,000	16,720,000
Unpaid Balance of Impaired Loans	18,066,000	21,288,000
Related Allowance for Credit Losses	1,361,000	864,000
Average Recorded Investment	16,633,000	22,651,000
Interest Income Recognized	36,000	188,000
Real estate segment [Member] | Construction, acquisition and development [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	45,816,000	61,335,000
Unpaid Balance of Impaired Loans	65,121,000	85,588,000
Related Allowance for Credit Losses	5,864,000	4,350,000
Average Recorded Investment	51,841,000	99,667,000
Interest Income Recognized	80,000	701,000
Real estate segment [Member] | Commercial real estate [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	49,703,000	50,413,000
Unpaid Balance of Impaired Loans	64,925,000	62,431,000
Related Allowance for Credit Losses	1,461,000	2,720,000
Average Recorded Investment	50,845,000	36,777,000
Interest Income Recognized	87,000	403,000
All other [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	1,234,000	1,546,000
Unpaid Balance of Impaired Loans	1,683,000	2,167,000
Related Allowance for Credit Losses	0	60,000
Average Recorded Investment	1,247,000	1,172,000
Interest Income Recognized	3,000	12,000
With no related allowance [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	105,792,000	115,729,000
Unpaid Balance of Impaired Loans	147,179,000	160,772,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	116,723,000	106,357,000
Interest Income Recognized	185,000	758,000
With no related allowance [Member] | Construction, acquisition and development [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	35,312,000	47,982,000
Unpaid Balance of Impaired Loans	52,293,000	69,331,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	42,612,000	54,085,000
Interest Income Recognized	55,000	324,000
With no related allowance [Member] | Construction, acquisition and development [Member] | Multi-family construction collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	0	0
Unpaid Balance of Impaired Loans	0	0
Related Allowance for Credit Losses	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
With no related allowance [Member] | Construction, acquisition and development [Member] | One-to-four family construction collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	6,771,000	8,475,000
Unpaid Balance of Impaired Loans	10,381,000	13,586,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	7,152,000	8,070,000
Interest Income Recognized	11,000	53,000
With no related allowance [Member] | Construction, acquisition and development [Member] | Recreation and all other loans collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	938,000	1,117,000
Unpaid Balance of Impaired Loans	1,156,000	1,335,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	1,052,000	623,000
Interest Income Recognized	1,000	5,000
With no related allowance [Member] | Construction, acquisition and development [Member] | Commercial construction collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	3,209,000	5,714,000
Unpaid Balance of Impaired Loans	3,869,000	6,646,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	3,210,000	3,585,000
Interest Income Recognized	1,000	51,000
With no related allowance [Member] | Construction, acquisition and development [Member] | Commercial acquisition and development collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	10,256,000	13,753,000
Unpaid Balance of Impaired Loans	11,635,000	15,786,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	11,701,000	12,145,000
Interest Income Recognized	16,000	63,000
With no related allowance [Member] | Construction, acquisition and development [Member] | Residential acquisition and development collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	14,138,000	18,923,000
Unpaid Balance of Impaired Loans	25,252,000	31,978,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	19,497,000	29,662,000
Interest Income Recognized	26,000	152,000
With no related allowance [Member] | Commercial and industrial segment [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	2,085,000	2,557,000
Unpaid Balance of Impaired Loans	3,800,000	4,169,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	2,641,000	2,779,000
Interest Income Recognized	0	12,000
With no related allowance [Member] | Real estate segment [Member] | Consumer mortgages [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	10,537,000	11,307,000
Unpaid Balance of Impaired Loans	14,357,000	15,464,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	12,331,000	11,762,000
Interest Income Recognized	16,000	77,000
With no related allowance [Member] | Real estate segment [Member] | Home equity [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	1,595,000	934,000
Unpaid Balance of Impaired Loans	1,739,000	1,078,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	1,476,000	858,000
Interest Income Recognized	3,000	6,000
With no related allowance [Member] | Real estate segment [Member] | Agricultural [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	4,289,000	4,435,000
Unpaid Balance of Impaired Loans	4,777,000	6,292,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	4,568,000	3,527,000
Interest Income Recognized	4,000	8,000
With no related allowance [Member] | Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	9,586,000	13,018,000
Unpaid Balance of Impaired Loans	12,513,000	16,551,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	12,040,000	12,674,000
Interest Income Recognized	33,000	123,000
With no related allowance [Member] | Real estate segment [Member] | Construction, acquisition and development [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	35,312,000	47,982,000
Unpaid Balance of Impaired Loans	52,293,000	69,331,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	42,612,000	54,085,000
Interest Income Recognized	55,000	324,000
With no related allowance [Member] | Real estate segment [Member] | Commercial real estate [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	41,154,000	33,952,000
Unpaid Balance of Impaired Loans	56,017,000	45,722,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	39,808,000	19,824,000
Interest Income Recognized	71,000	199,000
With no related allowance [Member] | All other [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	1,234,000	1,544,000
Unpaid Balance of Impaired Loans	1,683,000	2,165,000
Related Allowance for Credit Losses	0	0
Average Recorded Investment	1,247,000	848,000
Interest Income Recognized	3,000	9,000
With an allowance [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	31,999,000	40,999,000
Unpaid Balance of Impaired Loans	36,261,000	45,300,000
Related Allowance for Credit Losses	11,658,000	10,541,000
Average Recorded Investment	30,087,000	90,564,000
Interest Income Recognized	46,000	792,000
With an allowance [Member] | Construction, acquisition and development [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	10,504,000	13,353,000
Unpaid Balance of Impaired Loans	12,828,000	16,257,000
Related Allowance for Credit Losses	5,864,000	4,350,000
Average Recorded Investment	9,229,000	45,582,000
Interest Income Recognized	25,000	377,000
With an allowance [Member] | Construction, acquisition and development [Member] | Multi-family construction collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	0	0
Unpaid Balance of Impaired Loans	0	0
Related Allowance for Credit Losses	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
With an allowance [Member] | Construction, acquisition and development [Member] | One-to-four family construction collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	242,000	1,130,000
Unpaid Balance of Impaired Loans	400,000	1,475,000
Related Allowance for Credit Losses	94,000	290,000
Average Recorded Investment	501,000	4,094,000
Interest Income Recognized	0	29,000
With an allowance [Member] | Construction, acquisition and development [Member] | Recreation and all other loans collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	0	0
Unpaid Balance of Impaired Loans	0	0
Related Allowance for Credit Losses	0	0
Average Recorded Investment	0	69,000
Interest Income Recognized	0	0
With an allowance [Member] | Construction, acquisition and development [Member] | Commercial construction collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	0	0
Unpaid Balance of Impaired Loans	0	0
Related Allowance for Credit Losses	0	0
Average Recorded Investment	1,553,000	1,255,000
Interest Income Recognized	9,000	15,000
With an allowance [Member] | Construction, acquisition and development [Member] | Commercial acquisition and development collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	1,615,000	1,711,000
Unpaid Balance of Impaired Loans	1,615,000	1,960,000
Related Allowance for Credit Losses	467,000	563,000
Average Recorded Investment	1,335,000	9,206,000
Interest Income Recognized	2,000	74,000
With an allowance [Member] | Construction, acquisition and development [Member] | Residential acquisition and development collateral [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	8,647,000	10,512,000
Unpaid Balance of Impaired Loans	10,813,000	12,822,000
Related Allowance for Credit Losses	5,303,000	3,497,000
Average Recorded Investment	5,840,000	30,958,000
Interest Income Recognized	14,000	259,000
With an allowance [Member] | Commercial and industrial segment [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	1,374,000	2,288,000
Unpaid Balance of Impaired Loans	1,374,000	2,288,000
Related Allowance for Credit Losses	763,000	1,241,000
Average Recorded Investment	1,465,000	5,368,000
Interest Income Recognized	0	38,000
With an allowance [Member] | Real estate segment [Member] | Consumer mortgages [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	5,943,000	3,800,000
Unpaid Balance of Impaired Loans	6,601,000	3,914,000
Related Allowance for Credit Losses	1,962,000	1,103,000
Average Recorded Investment	3,104,000	10,323,000
Interest Income Recognized	2,000	88,000
With an allowance [Member] | Real estate segment [Member] | Home equity [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	442,000	446,000
Unpaid Balance of Impaired Loans	442,000	446,000
Related Allowance for Credit Losses	32,000	111,000
Average Recorded Investment	291,000	569,000
Interest Income Recognized	0	5,000
With an allowance [Member] | Real estate segment [Member] | Agricultural [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	555,000	947,000
Unpaid Balance of Impaired Loans	555,000	947,000
Related Allowance for Credit Losses	215,000	92,000
Average Recorded Investment	368,000	1,468,000
Interest Income Recognized	0	12,000
With an allowance [Member] | Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	4,632,000	3,702,000
Unpaid Balance of Impaired Loans	5,553,000	4,737,000
Related Allowance for Credit Losses	1,361,000	864,000
Average Recorded Investment	4,593,000	9,977,000
Interest Income Recognized	3,000	65,000
With an allowance [Member] | Real estate segment [Member] | Construction, acquisition and development [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	10,504,000	13,353,000
Unpaid Balance of Impaired Loans	12,828,000	16,257,000
Related Allowance for Credit Losses	5,864,000	4,350,000
Average Recorded Investment	9,229,000	45,582,000
Interest Income Recognized	25,000	377,000
With an allowance [Member] | Real estate segment [Member] | Commercial real estate [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	8,549,000	16,461,000
Unpaid Balance of Impaired Loans	8,908,000	16,709,000
Related Allowance for Credit Losses	1,461,000	2,720,000
Average Recorded Investment	11,037,000	16,953,000
Interest Income Recognized	16,000	204,000
With an allowance [Member] | All other [Member]
Impaired loans and leases, net of unearned income [Abstract]
Recorded Investment in Impaired Loans	0	2,000
Unpaid Balance of Impaired Loans	0	2,000
Related Allowance for Credit Losses	0	60,000
Average Recorded Investment	0	324,000
Interest Income Recognized	$ 0	$ 3,000