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Additional Information about Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 51,579 $ 36,399
Impaired loans with no related allowance, Unpaid Principal Balance 78,580 55,723
Impaired loans with no related allowance, Average Recorded Investment 43,989 34,782
Impaired loans with no related allowance, Interest Income Recognized 370 1,400
Impaired loans with an allowance recorded, Recorded Investment 1,257 11,853
Impaired loans with an allowance recorded, Unpaid Principal Balance 1,257 13,529
Impaired loans with an allowance recorded, Related Allowance 189 577
Impaired loans with an allowance recorded, Average Recorded Investment 6,555 4,574
Impaired loans with an allowance recorded, Interest Income Recognized 10 213
Total impaired loans, Recorded Investment 52,836 48,252
Total impaired loans, Unpaid Principal Balance 79,837 69,252
Total impaired loans, Related Allowance 189 577
Total impaired loans, Average Recorded Investment 50,544 39,356
Total impaired loans, Interest Income Recognized 380 1,613
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 10,223 10,742
Impaired loans with no related allowance, Unpaid Principal Balance 12,724 13,133
Impaired loans with no related allowance, Average Recorded Investment 10,482 11,431
Impaired loans with no related allowance, Interest Income Recognized 143 627
Total impaired loans, Recorded Investment 10,223 10,742
Total impaired loans, Unpaid Principal Balance 12,724 13,133
Total impaired loans, Average Recorded Investment 10,482 11,431
Total impaired loans, Interest Income Recognized 143 627
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 3,176 9,117
Impaired loans with no related allowance, Unpaid Principal Balance 8,946 14,868
Impaired loans with no related allowance, Average Recorded Investment 6,147 10,461
Impaired loans with no related allowance, Interest Income Recognized 23 143
Total impaired loans, Recorded Investment 3,176 9,117
Total impaired loans, Unpaid Principal Balance 8,946 14,868
Total impaired loans, Average Recorded Investment 6,147 10,461
Total impaired loans, Interest Income Recognized 23 143
One-to-four family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 3,837 3,601
Impaired loans with no related allowance, Unpaid Principal Balance 4,504 4,267
Impaired loans with no related allowance, Average Recorded Investment 3,719 3,079
Impaired loans with no related allowance, Interest Income Recognized 28 124
Total impaired loans, Recorded Investment 3,837 3,601
Total impaired loans, Unpaid Principal Balance 4,504 4,267
Total impaired loans, Average Recorded Investment 3,719 3,079
Total impaired loans, Interest Income Recognized 28 124
Acquisition, Development and Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 6,200 6,200
Impaired loans with no related allowance, Unpaid Principal Balance 15,500 15,500
Impaired loans with no related allowance, Average Recorded Investment 6,200 1,550
Impaired loans with no related allowance, Interest Income Recognized   414
Total impaired loans, Recorded Investment 6,200 6,200
Total impaired loans, Unpaid Principal Balance 15,500 15,500
Total impaired loans, Average Recorded Investment 6,200 1,550
Total impaired loans, Interest Income Recognized   414
Other loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 28,143 6,739
Impaired loans with no related allowance, Unpaid Principal Balance 36,906 7,955
Impaired loans with no related allowance, Average Recorded Investment 17,441 8,261
Impaired loans with no related allowance, Interest Income Recognized 176 92
Impaired loans with an allowance recorded, Recorded Investment 1,257 11,853
Impaired loans with an allowance recorded, Unpaid Principal Balance 1,257 13,529
Impaired loans with an allowance recorded, Related Allowance 189 577
Impaired loans with an allowance recorded, Average Recorded Investment 6,555 4,574
Impaired loans with an allowance recorded, Interest Income Recognized 10 213
Total impaired loans, Recorded Investment 29,400 18,592
Total impaired loans, Unpaid Principal Balance 38,163 21,484
Total impaired loans, Related Allowance 189 577
Total impaired loans, Average Recorded Investment 23,996 12,835
Total impaired loans, Interest Income Recognized $ 186 $ 305