Loans - Impaired Loans by Classification Type (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 26,119	$ 31,984
Total impaired loans Recorded Investment	28,693	37,367	$ 37,700
Unpaid Principal Balance	26,777	31,984
Total impaired loans Unpaid Principal Balance	29,351	38,945
Related Allowance	0	0
Average Recorded Investment	25,906	28,972
Interest Income Recognized	104	1,693
Recorded Investment	2,574	5,383
Unpaid Principal Balance	2,574	6,961
Related Allowance	746	1,514	$ 1,500
Average Recorded Investment	4,387	9,543
Total impaired loans Average Recorded Investment	30,293	38,515
Interest Income Recognized	16	273
Total impaired loans Interest Income Recognized	120	1,966
One-to-Four Family Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,148	3,501
Unpaid Principal Balance	2,175	3,501
Related Allowance	0	0
Average Recorded Investment	2,408	2,972
Interest Income Recognized	11	176
Recorded Investment	710	718
Unpaid Principal Balance	710	718
Related Allowance	46	51
Average Recorded Investment	712	1,434
Interest Income Recognized		44
Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	621	757
Unpaid Principal Balance	621	757
Related Allowance	0	0
Average Recorded Investment	693	690
Interest Income Recognized		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	18	39
Interest Income Recognized		2
Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,967	3,021
Unpaid Principal Balance	2,967	3,021
Related Allowance	0	0
Average Recorded Investment	2,982	1,342
Interest Income Recognized	34	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	9,456	7,740
Unpaid Principal Balance	10,087	7,740
Related Allowance	0	0
Average Recorded Investment	8,376	8,978
Interest Income Recognized	20	339
Recorded Investment	596	3,224
Unpaid Principal Balance	596	4,737
Related Allowance	116	663
Average Recorded Investment	2,009	3,418
Interest Income Recognized		160
Farmland [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	232	2,237
Unpaid Principal Balance	232	2,237
Related Allowance	0	0
Average Recorded Investment	237	3,968
Interest Income Recognized		125
Average Recorded Investment		619
Non-Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,949	12,057
Unpaid Principal Balance	8,949	12,057
Related Allowance	0	0
Average Recorded Investment	9,580	8,672
Interest Income Recognized	18	669
Recorded Investment	723	1,193
Unpaid Principal Balance	723	1,258
Related Allowance	445	738
Average Recorded Investment	952	3,617
Interest Income Recognized		69
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3	51
Unpaid Principal Balance	3	51
Related Allowance	0	0
Average Recorded Investment	5	36
Interest Income Recognized		3
Recorded Investment	191	248
Unpaid Principal Balance	191	248
Related Allowance	48	62
Average Recorded Investment	185	355
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,727	2,583
Unpaid Principal Balance	1,727	2,583
Related Allowance	0	0
Average Recorded Investment	1,607	2,246
Interest Income Recognized	21	154
Recorded Investment	354
Unpaid Principal Balance	354
Related Allowance	91
Average Recorded Investment	529	$ 100
Interest Income Recognized	$ 16

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