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Additional Information about Impaired Loans (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 66,195 $ 80,557
Impaired loans with no related allowance, Unpaid Principal Balance 136,737 154,647
Impaired loans with no related allowance, Average Recorded Investment 72,024 69,615
Impaired loans with no related allowance, Interest Income Recognized 2,071 3,412
Impaired loans with an allowance recorded, Recorded Investment 39  
Impaired loans with an allowance recorded, Unpaid Principal Balance 39  
Impaired loans with an allowance recorded, Related Allowance 39  
Impaired loans with an allowance recorded, Average Recorded Investment 26 314
Impaired loans with an allowance recorded, Interest Income Recognized 4  
Total impaired loans, Recorded Investment 66,234 80,557
Total impaired loans, Unpaid Principal Balance 136,776 154,647
Total impaired loans, Related Allowance 39  
Total impaired loans, Average Recorded Investment 72,050 69,929
Total impaired loans, Interest Income Recognized 2,075 3,412
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 5,990 8,892
Impaired loans with no related allowance, Unpaid Principal Balance 8,778 11,470
Impaired loans with no related allowance, Average Recorded Investment 7,771 9,554
Impaired loans with no related allowance, Interest Income Recognized 227 495
Total impaired loans, Recorded Investment 5,990 8,892
Total impaired loans, Unpaid Principal Balance 8,778 11,470
Total impaired loans, Average Recorded Investment 7,771 9,554
Total impaired loans, Interest Income Recognized 227 495
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 3,675 5,137
Impaired loans with no related allowance, Unpaid Principal Balance 8,790 10,252
Impaired loans with no related allowance, Average Recorded Investment 3,811 3,522
Impaired loans with no related allowance, Interest Income Recognized 29 92
Total impaired loans, Recorded Investment 3,675 5,137
Total impaired loans, Unpaid Principal Balance 8,790 10,252
Total impaired loans, Average Recorded Investment 3,811 3,522
Total impaired loans, Interest Income Recognized 29 92
One-to-four family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 1,669 1,966
Impaired loans with no related allowance, Unpaid Principal Balance 1,722 2,072
Impaired loans with no related allowance, Average Recorded Investment 1,861 2,489
Impaired loans with no related allowance, Interest Income Recognized 24 50
Total impaired loans, Recorded Investment 1,669 1,966
Total impaired loans, Unpaid Principal Balance 1,722 2,072
Total impaired loans, Average Recorded Investment 1,861 2,489
Total impaired loans, Interest Income Recognized 24 50
Acquisition, Development and Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 9,552 15,752
Impaired loans with no related allowance, Unpaid Principal Balance 10,452 25,952
Impaired loans with no related allowance, Average Recorded Investment 11,619 10,976
Impaired loans with no related allowance, Interest Income Recognized 287 575
Total impaired loans, Recorded Investment 9,552 15,752
Total impaired loans, Unpaid Principal Balance 10,452 25,952
Total impaired loans, Average Recorded Investment 11,619 10,976
Total impaired loans, Interest Income Recognized 287 575
Other loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 45,309 48,810
Impaired loans with no related allowance, Unpaid Principal Balance 106,995 104,901
Impaired loans with no related allowance, Average Recorded Investment 46,962 43,074
Impaired loans with no related allowance, Interest Income Recognized 1,504 2,200
Impaired loans with an allowance recorded, Recorded Investment 39  
Impaired loans with an allowance recorded, Unpaid Principal Balance 39  
Impaired loans with an allowance recorded, Related Allowance 39  
Impaired loans with an allowance recorded, Average Recorded Investment 26 314
Impaired loans with an allowance recorded, Interest Income Recognized 4  
Total impaired loans, Recorded Investment 45,348 48,810
Total impaired loans, Unpaid Principal Balance 107,034 104,901
Total impaired loans, Related Allowance 39  
Total impaired loans, Average Recorded Investment 46,988 43,388
Total impaired loans, Interest Income Recognized $ 1,508 $ 2,200