LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Impaired Loans With and Without Specific Reserves) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		$ 45,994		$ 45,994		$ 43,935
Recorded Investment, Without Allowance	[1]	32,003		32,003		25,357
Recorded Investment, With Allowance	[2]	10,795		10,795		16,129
Related Allowance		773		773		1,420
Average Recorded Investment		39,615	$ 49,891	37,741	$ 51,065
Interest Income Recognized		198	288	656	816
Commerical real estate - owner-occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		8,250		8,250		3,786
Recorded Investment, Without Allowance	[1]	7,438		7,438		3,373
Recorded Investment, With Allowance	[2]	200		200		203
Related Allowance		19		19		20
Average Recorded Investment		3,657	2,544	3,079	2,673
Interest Income Recognized		3	3	7	9
Commercial real estate - investment properties [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		7,657		7,657		9,916
Recorded Investment, Without Allowance	[1]	4,247		4,247		5,565
Recorded Investment, With Allowance	[2]	3,208		3,208		4,304
Related Allowance		245		245		408
Average Recorded Investment		8,849	19,046	8,393	19,775
Interest Income Recognized		37	74	124	224
Multifamily real estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance						508
Recorded Investment, Without Allowance	[1]					147
Recorded Investment, With Allowance	[2]					349
Related Allowance						64
Average Recorded Investment		115	529	335	518
Interest Income Recognized		1	27	10	36
One- to four-family construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance						1,180
Recorded Investment, Without Allowance	[1]					0
Recorded Investment, With Allowance	[2]					1,180
Related Allowance						156
Average Recorded Investment		0	1,176	524	1,151
Interest Income Recognized		0	3	27	56
Land and land development - residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		1,322		1,322		3,012
Recorded Investment, Without Allowance	[1]	798		798		750
Recorded Investment, With Allowance	[2]	193		193		1,106
Related Allowance		66		66		219
Average Recorded Investment		1,095	1,964	1,574	1,971
Interest Income Recognized		6	20	42	63
Land and land development - commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		1,538		1,538		1,608
Recorded Investment, Without Allowance	[1]	928		928		998
Recorded Investment, With Allowance	[2]	0		0		0
Related Allowance		0		0		0
Average Recorded Investment		928	997	950	1,005
Interest Income Recognized		0	0	0	0
Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		7,945		7,945		3,753
Recorded Investment, Without Allowance	[1]	7,195		7,195		3,074
Recorded Investment, With Allowance	[2]	573		573		651
Related Allowance		52		52		69
Average Recorded Investment		8,128	4,283	5,838	4,470
Interest Income Recognized		6	16	63	28
Agricultural business, including secured by farmland [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		8,579		8,579		6,438
Recorded Investment, Without Allowance	[1]	6,956		6,956		6,354
Recorded Investment, With Allowance	[2]	500		500		0
Related Allowance		196		196		0
Average Recorded Investment		6,196	4,973	5,605	4,824
Interest Income Recognized		69	6	131	19
One- to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		8,858		8,858		11,439
Recorded Investment, Without Allowance	[1]	2,878		2,878		3,149
Recorded Investment, With Allowance	[2]	5,904		5,904		8,026
Related Allowance		184		184		479
Average Recorded Investment		8,899	11,973	9,602	12,193
Interest Income Recognized		73	131	240	358
Consumer secured by one- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		1,698		1,698		1,904
Recorded Investment, Without Allowance	[1]	1,492		1,492		1,721
Recorded Investment, With Allowance	[2]	140		140		144
Related Allowance		7		7		1
Average Recorded Investment		1,608	1,894	1,647	1,913
Interest Income Recognized		2	5	7	13
Consumer - other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		147		147		391
Recorded Investment, Without Allowance	[1]	71		71		226
Recorded Investment, With Allowance	[2]	77		77		166
Related Allowance		4		4		$ 4
Average Recorded Investment		140	512	194	572
Interest Income Recognized		$ 1	$ 3	$ 5	$ 10

[1] Includes loans without an allowance reserve that have been individually evaluated for impairment and that evaluation concluded that no reserve was needed and $9.3 million and $10.0 million of homogenous and small balance loans as of September 30, 2017 and December 31, 2016, respectively, that are collectively evaluated for impairment for which a general reserve has been established.

[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 less costs to sell to establish realizable value.