LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Impaired Loans With and Without Specific Reserves) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 45,891		$ 72,196
Unpaid Principal Balance	49,319		78,371
Related Allowance	3,092		5,477
Average Recorded Investment	45,440		74,349
Interest Income Recognized	1,528		2,195
Commerical real estate - owner-occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,548		2,652
Unpaid Principal Balance	1,598		2,702
Related Allowance	24		35
Average Recorded Investment	1,841		2,761
Interest Income Recognized	12		12
Commerical real estate - investment properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,054		9,188
Unpaid Principal Balance	6,458		11,369
Related Allowance	729		504
Average Recorded Investment	6,145		8,977
Interest Income Recognized	315		241
Multifamily real estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	786		5,744
Unpaid Principal Balance	786		5,744
Related Allowance	86		1,139
Average Recorded Investment	795		5,705
Interest Income Recognized	45		298
One-to four-family construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,923		7,133
Unpaid Principal Balance	3,923		7,213
Related Allowance	640		1,002
Average Recorded Investment	2,655		5,870
Interest Income Recognized	118		239
Land and land development - residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,554		4,985
Unpaid Principal Balance	3,710		6,140
Related Allowance	346		760
Average Recorded Investment	2,872		6,053
Interest Income Recognized	89		221
Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,276		2,022
Unpaid Principal Balance	1,502		2,338
Related Allowance	128		326
Average Recorded Investment	1,328		2,236
Interest Income Recognized	41		59
Agricultural business, including secured by farmland [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,597		105
Unpaid Principal Balance	1,597		105
Related Allowance	26		8
Average Recorded Investment	1,866		110
Interest Income Recognized	0		8
One- to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	26,394		38,445
Unpaid Principal Balance	27,855		40,669
Related Allowance	1,032		1,621
Average Recorded Investment	26,093		40,557
Interest Income Recognized	870		1,063
Consumer secured by one- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,151		1,276
Unpaid Principal Balance	1,256		1,420
Related Allowance	75		46
Average Recorded Investment	1,248		1,403
Interest Income Recognized	19		25
Consumer - other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	608		646
Unpaid Principal Balance	634		671
Related Allowance	6		36
Average Recorded Investment	597		677
Interest Income Recognized	19		29
Without a specific allowance reserve [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,445	[1]	11,549	[1]
Unpaid Principal Balance	12,534	[1]	13,230	[1]
Related Allowance	126	[1]	289	[1]
Average Recorded Investment	10,650	[1]	12,275	[1]
Interest Income Recognized	32	[1]	48	[1]
Without a specific allowance reserve [Member] | Commerical real estate - owner-occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	399	[1]	534	[1]
Unpaid Principal Balance	449	[1]	584	[1]
Related Allowance	20	[1]	31	[1]
Average Recorded Investment	526	[1]	569	[1]
Interest Income Recognized	0	[1]	0	[1]
Without a specific allowance reserve [Member] | Commerical real estate - investment properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	32	[1]	429	[1]
Unpaid Principal Balance	32	[1]	974	[1]
Related Allowance	5	[1]	89	[1]
Average Recorded Investment	44	[1]	624	[1]
Interest Income Recognized	0	[1]	0	[1]
Without a specific allowance reserve [Member] | Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	537	[1]	724	[1]
Unpaid Principal Balance	763	[1]	1,040	[1]
Related Allowance	46	[1]	104	[1]
Average Recorded Investment	566	[1]	896	[1]
Interest Income Recognized	0	[1]	0	[1]
Without a specific allowance reserve [Member] | Agricultural business, including secured by farmland [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	853	[1]	105	[1]
Unpaid Principal Balance	853	[1]	105	[1]
Related Allowance	26	[1]	8	[1]
Average Recorded Investment	1,122	[1]	110	[1]
Interest Income Recognized	0	[1]	8	[1]
Without a specific allowance reserve [Member] | One- to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,546	[1]	8,611	[1]
Unpaid Principal Balance	9,244	[1]	9,229	[1]
Related Allowance	18	[1]	42	[1]
Average Recorded Investment	7,284	[1]	8,889	[1]
Interest Income Recognized	29	[1]	31	[1]
Without a specific allowance reserve [Member] | Consumer secured by one- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	783	[1]	870	[1]
Unpaid Principal Balance	888	[1]	1,013	[1]
Related Allowance	11	[1]	13	[1]
Average Recorded Investment	838	[1]	900	[1]
Interest Income Recognized	3	[1]	1	[1]
Without a specific allowance reserve [Member] | Consumer - other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	295	[1]	276	[1]
Unpaid Principal Balance	305	[1]	285	[1]
Related Allowance	0	[1]	2	[1]
Average Recorded Investment	270	[1]	287	[1]
Interest Income Recognized	0	[1]	8	[1]
With a specific allowance reserve [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	34,446	[2]	60,647	[2]
Unpaid Principal Balance	36,785	[2]	65,141	[2]
Related Allowance	2,966	[2]	5,188	[2]
Average Recorded Investment	34,790	[2]	62,074	[2]
Interest Income Recognized	1,496	[2]	2,147	[2]
With a specific allowance reserve [Member] | Commerical real estate - owner-occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,149	[2]	2,118	[2]
Unpaid Principal Balance	1,149	[2]	2,118	[2]
Related Allowance	4	[2]	4	[2]
Average Recorded Investment	1,315	[2]	2,192	[2]
Interest Income Recognized	12	[2]	12	[2]
With a specific allowance reserve [Member] | Commerical real estate - investment properties [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,022	[2]	8,759	[2]
Unpaid Principal Balance	6,426	[2]	10,395	[2]
Related Allowance	724	[2]	415	[2]
Average Recorded Investment	6,101	[2]	8,353	[2]
Interest Income Recognized	315	[2]	241	[2]
With a specific allowance reserve [Member] | Multifamily real estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	786	[2]	5,744	[2]
Unpaid Principal Balance	786	[2]	5,744	[2]
Related Allowance	86	[2]	1,139	[2]
Average Recorded Investment	795	[2]	5,705	[2]
Interest Income Recognized	45	[2]	298	[2]
With a specific allowance reserve [Member] | One-to four-family construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,923	[2]	7,133	[2]
Unpaid Principal Balance	3,923	[2]	7,213	[2]
Related Allowance	640	[2]	1,002	[2]
Average Recorded Investment	2,655	[2]	5,870	[2]
Interest Income Recognized	118	[2]	239	[2]
With a specific allowance reserve [Member] | Land and land development - residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,554	[2]	4,985	[2]
Unpaid Principal Balance	3,710	[2]	6,140	[2]
Related Allowance	346	[2]	760	[2]
Average Recorded Investment	2,872	[2]	6,053	[2]
Interest Income Recognized	89	[2]	221	[2]
With a specific allowance reserve [Member] | Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	739	[2]	1,298	[2]
Unpaid Principal Balance	739	[2]	1,298	[2]
Related Allowance	82	[2]	222	[2]
Average Recorded Investment	762	[2]	1,340	[2]
Interest Income Recognized	41	[2]	59	[2]
With a specific allowance reserve [Member] | Agricultural business, including secured by farmland [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	744	[2]
Unpaid Principal Balance	744	[2]
Related Allowance	0	[2]
Average Recorded Investment	744	[2]
Interest Income Recognized	0	[2]
With a specific allowance reserve [Member] | One- to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	17,848	[2]	29,834	[2]
Unpaid Principal Balance	18,611	[2]	31,440	[2]
Related Allowance	1,014	[2]	1,579	[2]
Average Recorded Investment	18,809	[2]	31,668	[2]
Interest Income Recognized	841	[2]	1,032	[2]
With a specific allowance reserve [Member] | Consumer secured by one- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	368	[2]	406	[2]
Unpaid Principal Balance	368	[2]	407	[2]
Related Allowance	64	[2]	33	[2]
Average Recorded Investment	410	[2]	503	[2]
Interest Income Recognized	16	[2]	24	[2]
With a specific allowance reserve [Member] | Consumer - other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	313	[2]	370	[2]
Unpaid Principal Balance	329	[2]	386	[2]
Related Allowance	6	[2]	34	[2]
Average Recorded Investment	327	[2]	390	[2]
Interest Income Recognized	$ 19	[2]	$ 21	[2]

[1] Loans without a specific allowance reserve have not been individually evaluated for impairment, but have been included in pools of homogeneous loans for evaluation of related allowance reserves.

[2] Loans with a specific allowance reserve have been individually evaluated for impairment using either a discounted cash flow analysis or, for collateral dependent loans, current appraisals to establish realizable value. These analyses may identify a specific impairment amount needed or may conclude that no reserve is needed. Any specific impairment that is identified is included in the category’s "Related Allowance" column.