LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Impaired Loans and Related Allowance Reserve) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	$ 36,633,000	$ 72,988,000
Past due and still accruing	2,078,000	2,324,000
TDRs	62,438,000	54,533,000
Total impaired loans	101,149,000	129,845,000
Nonaccrual loans, allocated reserves	1,636,000	7,197,000
Past due and still accruing, allocated reserves	3,000	19,000
TDRs, allocated reserves	6,523,000	3,100,000
Allocated Reserve	8,162,000	10,316,000
Commitments to advance funds to TDRs	2,600,000
Commerical real estate - owner-occupied [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	2,895,000	4,306,000
Past due and still accruing	0	0
Total impaired loans	4,667,000	4,495,000
Nonaccrual loans, allocated reserves	111,000	281,000
Allocated Reserve	138,000	285,000
Commerical real estate - investment properties [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	2,679,000	4,920,000
Past due and still accruing	0	0
Total impaired loans	10,035,000	13,326,000
Nonaccrual loans, allocated reserves	62,000	626,000
Allocated Reserve	1,047,000	1,746,000
Multifamily real estate [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	0	362,000
Past due and still accruing	0	0
Total impaired loans	7,134,000	2,449,000
Nonaccrual loans, allocated reserves	0	11,000
Allocated Reserve	1,847,000	17,000
Commercial construction [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	0	949,000
Past due and still accruing	0	0
Total impaired loans		949,000
Nonaccrual loans, allocated reserves	0	0
Allocated Reserve		0
One-to four-family construction [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	3,271,000	6,622,000
Past due and still accruing	0	0
Total impaired loans	12,200,000	14,985,000
Nonaccrual loans, allocated reserves	40,000	1,921,000
Allocated Reserve	1,183,000	2,435,000
Land and land development - residential [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	3,840,000	19,060,000
Past due and still accruing	0	0
Total impaired loans	9,725,000	24,395,000
Nonaccrual loans, allocated reserves	519,000	1,485,000
Allocated Reserve	1,239,000	1,792,000
Land and land development - commercial [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	340,000	1,100,000
Past due and still accruing	0	0
Total impaired loans	340,000	1,099,000
Nonaccrual loans, allocated reserves	9,000	45,000
Allocated Reserve	9,000	45,000
Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	6,158,000	13,460,000
Past due and still accruing	15,000	4,000
Total impaired loans	9,843,000	18,062,000
Nonaccrual loans, allocated reserves	220,000	1,871,000
Allocated Reserve	1,193,000	2,336,000
Agricultural business/farmland [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	645,000	1,896,000
Past due and still accruing	0	0
Total impaired loans	645,000	1,895,000
Nonaccrual loans, allocated reserves	66,000	629,000
Allocated Reserve	66,000	629,000
One- to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	14,234,000	17,408,000
Past due and still accruing	2,037,000	2,147,000
Total impaired loans	42,939,000	44,406,000
Nonaccrual loans, allocated reserves	571,000	243,000
Allocated Reserve	1,340,000	935,000
Total consumer [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	2,571,000	2,905,000
Nonaccrual loans, allocated reserves	38,000	85,000
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	1,168,000	1,115,000
Past due and still accruing	21,000	25,000
Total impaired loans	1,680,000	1,474,000
Nonaccrual loans, allocated reserves	13,000	62,000
Allocated Reserve	46,000	67,000
Consumer secured by one- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	1,403,000	1,790,000
Past due and still accruing	5,000	148,000
Total impaired loans	1,941,000	2,310,000
Nonaccrual loans, allocated reserves	25,000	23,000
Allocated Reserve	$ 54,000	$ 29,000