LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Impaired Loans and Related Allowance Reserve) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	$ 31,361,000	$ 72,988,000
Past due and still accruing	3,029,000	2,324,000
TDRs on accrual	57,462,000	54,533,000
Total impaired loans	91,852,000	129,845,000
Nonaccrual loans, allocated reserves	2,256,000	7,197,000
Past due and still accruing, allocated reserves	62,000	19,000
TDRs on accrual, allocated reserves	6,020,000	3,100,000
Allocated Reserve	8,338,000	10,316,000
Commitments to advance funds to TDRs	1,800,000
Commerical real estate - owner-occupied [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	4,105,000	4,306,000
Past due and still accruing	0	0
TDRs on accrual	188,000	189,000
Total impaired loans	4,293,000	4,495,000
Nonaccrual loans, allocated reserves	618,000	281,000
TDRs on accrual, allocated reserves	4,000	3,000
Allocated Reserve	621,000	285,000
Commerical real estate - investment properties [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	2,474,000	4,920,000
Past due and still accruing	0	0
TDRs on accrual	7,034,000	8,406,000
Total impaired loans	9,508,000	13,326,000
Nonaccrual loans, allocated reserves	56,000	626,000
TDRs on accrual, allocated reserves	664,000	1,119,000
Allocated Reserve	720,000	1,746,000
Multifamily real estate [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	0	362,000
Past due and still accruing	0	0
TDRs on accrual	7,131,000	2,088,000
Total impaired loans	7,131,000	2,449,000
Nonaccrual loans, allocated reserves	0	11,000
TDRs on accrual, allocated reserves	1,665,000	6,000
Allocated Reserve	1,665,000	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	1,565,000	6,622,000
Past due and still accruing	0	0
TDRs on accrual	6,726,000	8,362,000
Total impaired loans	8,291,000	14,985,000
Nonaccrual loans, allocated reserves	326,000	1,921,000
TDRs on accrual, allocated reserves	1,115,000	514,000
Allocated Reserve	1,441,000	2,435,000
Land and land development - residential [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	2,061,000	19,060,000
Past due and still accruing	0	0
TDRs on accrual	4,842,000	5,334,000
Total impaired loans	6,904,000	24,395,000
Nonaccrual loans, allocated reserves	323,000	1,485,000
TDRs on accrual, allocated reserves	667,000	306,000
Allocated Reserve	990,000	1,792,000
Land and land development - commercial [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	46,000	1,100,000
Past due and still accruing	0	0
Total impaired loans	46,000	1,099,000
Nonaccrual loans, allocated reserves	12,000	45,000
Allocated Reserve	12,000	45,000
Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	4,750,000	13,460,000
Past due and still accruing	0	4,000
TDRs on accrual	2,975,000	4,598,000
Total impaired loans	7,725,000	18,062,000
Nonaccrual loans, allocated reserves	344,000	1,871,000
TDRs on accrual, allocated reserves	610,000	468,000
Allocated Reserve	955,000	2,336,000
Agricultural business, including secured by farmland [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	0	1,896,000
Past due and still accruing	0	0
Total impaired loans		1,895,000
Nonaccrual loans, allocated reserves	0	629,000
Allocated Reserve		629,000
One- to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	12,964,000	17,408,000
Past due and still accruing	2,877,000	2,147,000
TDRs on accrual	27,540,000	24,851,000
Total impaired loans	43,380,000	44,406,000
Nonaccrual loans, allocated reserves	520,000	243,000
TDRs on accrual, allocated reserves	1,228,000	675,000
Allocated Reserve	1,806,000	935,000
Consumer secured by one- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	2,073,000	1,790,000
Past due and still accruing	0	148,000
TDRs on accrual	538,000	334,000
Total impaired loans	2,683,000	2,310,000
Nonaccrual loans, allocated reserves	41,000	23,000
TDRs on accrual, allocated reserves	29,000	6,000
Allocated Reserve	80,000	29,000
Consumer - other Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	1,323,000	1,115,000
Past due and still accruing	152,000	25,000
TDRs on accrual	488,000	371,000
Total impaired loans	1,891,000	1,474,000
Nonaccrual loans, allocated reserves	16,000	62,000
TDRs on accrual, allocated reserves	38,000	3,000
Allocated Reserve	$ 48,000	$ 67,000