LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Age Analysis of Company's Past Due Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	$ 6,366	$ 9,870
60 to 89 Days Past Due	4,086	4,264
Greater Than 90 Days Past Due	11,558	19,267
Total Past Due	22,010	33,401
Current	3,396,435	3,202,313
Total loans outstanding	3,418,445	3,235,714
Loans 90 Days or More Past Due and Accruing	2,860	3,029
Commerical real estate - owner-occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	883	1,693
60 to 89 Days Past Due	550	0
Greater Than 90 Days Past Due	813	1,371
Total Past Due	2,246	3,064
Current	500,355	486,517
Total loans outstanding	502,601	489,581
Loans 90 Days or More Past Due and Accruing	0	0
Commerical real estate - investment properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	743
60 to 89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	1,431
Total Past Due	0	2,174
Current	692,457	581,467
Total loans outstanding	692,457	583,641
Loans 90 Days or More Past Due and Accruing	0	0
Multifamily real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	1,845	0
60 to 89 Days Past Due	785	0
Greater Than 90 Days Past Due	0	0
Total Past Due	2,630	0
Current	134,523	137,504
Total loans outstanding	137,153	137,504
Loans 90 Days or More Past Due and Accruing	0	0
Commercial construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	0
60 to 89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	0	0
Current	12,168	30,229
Total loans outstanding	12,168	30,229
Loans 90 Days or More Past Due and Accruing	0	0
Multifamily construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	0
60 to 89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	0	0
Current	52,081	22,581
Total loans outstanding	52,081	22,581
Loans 90 Days or More Past Due and Accruing	0	0
One-to four-family construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	9	611
60 to 89 Days Past Due	7	0
Greater Than 90 Days Past Due	4	0
Total Past Due	20	611
Current	200,844	160,204
Total loans outstanding	200,864	160,815
Loans 90 Days or More Past Due and Accruing	0	0
Land and land development - residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	0
60 to 89 Days Past Due	0	0
Greater Than 90 Days Past Due	251	2,047
Total Past Due	251	2,047
Current	75,444	74,963
Total loans outstanding	75,695	77,010
Loans 90 Days or More Past Due and Accruing	0	0
Land and land development - commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	2,083
60 to 89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	45
Total Past Due	0	2,128
Current	10,450	11,854
Total loans outstanding	10,450	13,982
Loans 90 Days or More Past Due and Accruing	0	0
Commercial business [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	2,001	1,849
60 to 89 Days Past Due	2	49
Greater Than 90 Days Past Due	299	842
Total Past Due	2,302	2,740
Current	679,867	615,309
Total loans outstanding	682,169	618,049
Loans 90 Days or More Past Due and Accruing	0	0
Agricultural business, including secured by farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	0	0
60 to 89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	0	0
Current	228,291	230,031
Total loans outstanding	228,291	230,031
Loans 90 Days or More Past Due and Accruing	105	0
One- to four-family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	521	1,376
60 to 89 Days Past Due	2,550	3,468
Greater Than 90 Days Past Due	9,142	11,488
Total Past Due	12,213	16,332
Current	517,281	565,338
Total loans outstanding	529,494	581,670
Loans 90 Days or More Past Due and Accruing	2,611	2,877
Consumer secured by one- to four-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	723	699
60 to 89 Days Past Due	93	74
Greater Than 90 Days Past Due	918	1,204
Total Past Due	1,734	1,977
Current	171,454	168,146
Total loans outstanding	173,188	170,123
Loans 90 Days or More Past Due and Accruing	13	72
Consumer - other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 Days Past Due	384	816
60 to 89 Days Past Due	99	673
Greater Than 90 Days Past Due	131	839
Total Past Due	614	2,328
Current	121,220	118,170
Total loans outstanding	121,834	120,498
Loans 90 Days or More Past Due and Accruing	$ 131	$ 80