Loans - Impaired Loans by Classification Type (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 19,420	$ 31,984
Total impaired loans Recorded Investment	23,483	37,367	$ 38,400
Unpaid Principal Balance	19,420	31,984
Total impaired loans Unpaid Principal Balance	24,500	38,945
Related Allowance	0	0
Average Recorded Investment	23,743	28,972
Interest Income Recognized	901	1,693
Recorded Investment	4,063	5,383
Unpaid Principal Balance	5,080	6,961
Related Allowance	545	1,514	$ 2,900
Average Recorded Investment	4,278	9,543
Total impaired loans Average Recorded Investment	28,021	38,515
Interest Income Recognized	129	273
Total impaired loans Interest Income Recognized	1,030	1,966
One-to-Four Family Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,212	3,501
Unpaid Principal Balance	2,212	3,501
Related Allowance	0	0
Average Recorded Investment	2,343	2,972
Interest Income Recognized	55	176
Recorded Investment	707	718
Unpaid Principal Balance	707	718
Related Allowance	29	51
Average Recorded Investment	710	1,434
Interest Income Recognized	30	44
Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	273	757
Unpaid Principal Balance	273	757
Related Allowance	0	0
Average Recorded Investment	553	690
Interest Income Recognized	9	35
Junior Liens [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	16	37
Unpaid Principal Balance	16	37
Related Allowance	0	0
Average Recorded Investment	17	39
Interest Income Recognized	1	2
Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,094	3,021
Unpaid Principal Balance	3,094	3,021
Related Allowance	0	0
Average Recorded Investment	3,019	1,342
Interest Income Recognized	126	190
Construction [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0	0
Average Recorded Investment		29
Land [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,290	7,740
Unpaid Principal Balance	7,290	7,740
Related Allowance	0	0
Average Recorded Investment	8,014	8,978
Interest Income Recognized	350	339
Recorded Investment	2,231	3,224
Unpaid Principal Balance	3,248	4,737
Related Allowance	266	663
Average Recorded Investment	2,083	3,418
Interest Income Recognized	72	160
Farmland [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	330	2,237
Unpaid Principal Balance	330	2,237
Related Allowance	0	0
Average Recorded Investment	268	3,968
Interest Income Recognized	35	125
Average Recorded Investment		619
Non-Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,297	12,057
Unpaid Principal Balance	4,297	12,057
Related Allowance	0	0
Average Recorded Investment	7,819	8,672
Interest Income Recognized	253	669
Recorded Investment	721	1,193
Unpaid Principal Balance	721	1,258
Related Allowance	143	738
Average Recorded Investment	875	3,617
Interest Income Recognized	20	69
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		51
Unpaid Principal Balance		51
Related Allowance	0	0
Average Recorded Investment	3	36
Interest Income Recognized		3
Recorded Investment	204	248
Unpaid Principal Balance	204	248
Related Allowance	51	62
Average Recorded Investment	191	355
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,908	2,583
Unpaid Principal Balance	1,908	2,583
Related Allowance	0	0
Average Recorded Investment	1,707	2,246
Interest Income Recognized	72	154
Recorded Investment	200
Unpaid Principal Balance	200
Related Allowance	56
Average Recorded Investment	419	$ 100
Interest Income Recognized	$ 7

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