LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Impaired Loans and Related Allowance Reserve) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	$ 12,487	$ 14,562
Past due and still accruing	10,804	2,175
Troubled debt restructuring performing under restructured terms	26,114	29,154
Total impaired loans	49,405	45,891
Nonaccrual loans, allocated reserves	208	179
Past due and still accruing, allocated reserves	152	10
Troubled debt restructuring performing under restructured terms, allocated reserves	2,218	2,903
Allocated Reserve	2,578	3,092
Commitments to advance additional funds related to TDRs	660	2,095
Commerical real estate - owner-occupied [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	1,052	1,365
Past due and still accruing	1,835	0
Troubled debt restructuring performing under restructured terms	183	184
Total impaired loans	3,071	1,548
Nonaccrual loans, allocated reserves	32	20
Past due and still accruing, allocated reserves	0	0
Troubled debt restructuring performing under restructured terms, allocated reserves	4	4
Allocated Reserve	36	24
Commerical real estate - investment properties [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	19	32
Past due and still accruing	0	0
Troubled debt restructuring performing under restructured terms	5,912	6,021
Total impaired loans	5,931	6,054
Nonaccrual loans, allocated reserves	3	5
Troubled debt restructuring performing under restructured terms, allocated reserves	625	724
Allocated Reserve	629	729
Multifamily real estate [Member]
Financing Receivable, Impaired [Line Items]
Past due and still accruing	570	0
Troubled debt restructuring performing under restructured terms	776	786
Total impaired loans	1,346	786
Past due and still accruing, allocated reserves	0	0
Troubled debt restructuring performing under restructured terms, allocated reserves	82	86
Allocated Reserve	82	86
One- to four-family construction [Member]
Financing Receivable, Impaired [Line Items]
Past due and still accruing	1,186	0
Troubled debt restructuring performing under restructured terms	2,434	3,923
Total impaired loans	3,620	3,923
Past due and still accruing, allocated reserves	0	0
Troubled debt restructuring performing under restructured terms, allocated reserves	261	640
Allocated Reserve	262	640
Land and land development - residential [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	1,254	1,275
Past due and still accruing	0	0
Troubled debt restructuring performing under restructured terms	1,227	1,279
Total impaired loans	2,481	2,554
Nonaccrual loans, allocated reserves	0	0
Troubled debt restructuring performing under restructured terms, allocated reserves	257	346
Allocated Reserve	257	346
Land and land development - commercial [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	1,900	0
Past due and still accruing	4,765	0
Total impaired loans	6,665
Nonaccrual loans, allocated reserves	0	0
Past due and still accruing, allocated reserves	0	0
Allocated Reserve	0
Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	179	537
Past due and still accruing	0	0
Troubled debt restructuring performing under restructured terms	687	739
Total impaired loans	866	1,276
Nonaccrual loans, allocated reserves	9	46
Troubled debt restructuring performing under restructured terms, allocated reserves	75	82
Allocated Reserve	84	128
Agricultural business, including secured by farmland [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	1,560	1,597
Past due and still accruing	0	0
Troubled debt restructuring performing under restructured terms	694	0
Total impaired loans	2,254	1,597
Nonaccrual loans, allocated reserves	123	26
Troubled debt restructuring performing under restructured terms, allocated reserves	16	0
Allocated Reserve	139	26
One- to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	5,662	8,507
Past due and still accruing	1,976	2,095
Troubled debt restructuring performing under restructured terms	13,810	15,792
Total impaired loans	21,447	26,394
Nonaccrual loans, allocated reserves	4	35
Past due and still accruing, allocated reserves	152	10
Troubled debt restructuring performing under restructured terms, allocated reserves	869	987
Allocated Reserve	1,024	1,032
Consumer secured by one- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	742	838
Past due and still accruing	0	80
Troubled debt restructuring performing under restructured terms	211	233
Total impaired loans	953	1,151
Nonaccrual loans, allocated reserves	36	47
Past due and still accruing, allocated reserves	0	0
Troubled debt restructuring performing under restructured terms, allocated reserves	24	28
Allocated Reserve	59	75
Consumer - other [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	119	411
Past due and still accruing	472	0
Troubled debt restructuring performing under restructured terms	180	197
Total impaired loans	771	608
Nonaccrual loans, allocated reserves	1	0
Past due and still accruing, allocated reserves	0	0
Troubled debt restructuring performing under restructured terms, allocated reserves	5	6
Allocated Reserve	$ 6	$ 6