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Additional Information about Impaired Loans (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 64,904 $ 80,557
Impaired loans with no related allowance, Unpaid Principal Balance 137,449 154,647
Impaired loans with no related allowance, Average Recorded Investment 70,243 69,615
Impaired loans with no related allowance, Interest Income Recognized 3,290 3,412
Impaired loans with an allowance recorded, Recorded Investment 0 0
Impaired loans with an allowance recorded, Unpaid Principal Balance 0 0
Impaired loans with an allowance recorded, Related Allowance 0 0
Impaired loans with an allowance recorded, Average Recorded Investment 20 314
Impaired loans with an allowance recorded, Interest Income Recognized 0 0
Total impaired loans, Recorded Investment 64,904 80,557
Total impaired loans, Unpaid Principal Balance 137,449 154,647
Total impaired loans, Related Allowance 0 0
Total impaired loans, Average Recorded Investment 70,263 69,929
Total impaired loans, Interest Income Recognized 3,290 3,412
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 5,815 8,892
Impaired loans with no related allowance, Unpaid Principal Balance 8,676 11,470
Impaired loans with no related allowance, Average Recorded Investment 7,282 9,554
Impaired loans with no related allowance, Interest Income Recognized 323 495
Impaired loans with an allowance recorded, Recorded Investment 0 0
Impaired loans with an allowance recorded, Unpaid Principal Balance 0 0
Impaired loans with an allowance recorded, Related Allowance 0 0
Impaired loans with an allowance recorded, Interest Income Recognized 0 0
Total impaired loans, Recorded Investment 5,815 8,892
Total impaired loans, Unpaid Principal Balance 8,676 11,470
Total impaired loans, Related Allowance 0 0
Total impaired loans, Average Recorded Investment 7,282 9,554
Total impaired loans, Interest Income Recognized 323 495
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 4,386 5,137
Impaired loans with no related allowance, Unpaid Principal Balance 9,501 10,252
Impaired loans with no related allowance, Average Recorded Investment 3,955 3,522
Impaired loans with no related allowance, Interest Income Recognized 62 92
Impaired loans with an allowance recorded, Recorded Investment 0 0
Impaired loans with an allowance recorded, Unpaid Principal Balance 0 0
Impaired loans with an allowance recorded, Related Allowance 0 0
Impaired loans with an allowance recorded, Interest Income Recognized 0 0
Total impaired loans, Recorded Investment 4,386 5,137
Total impaired loans, Unpaid Principal Balance 9,501 10,252
Total impaired loans, Related Allowance 0 0
Total impaired loans, Average Recorded Investment 3,955 3,522
Total impaired loans, Interest Income Recognized 62 92
One-to-four family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 1,665 1,966
Impaired loans with no related allowance, Unpaid Principal Balance 1,719 2,072
Impaired loans with no related allowance, Average Recorded Investment 1,812 2,489
Impaired loans with no related allowance, Interest Income Recognized 36 50
Impaired loans with an allowance recorded, Recorded Investment 0 0
Impaired loans with an allowance recorded, Unpaid Principal Balance 0 0
Impaired loans with an allowance recorded, Related Allowance 0 0
Impaired loans with an allowance recorded, Interest Income Recognized 0 0
Total impaired loans, Recorded Investment 1,665 1,966
Total impaired loans, Unpaid Principal Balance 1,719 2,072
Total impaired loans, Related Allowance 0 0
Total impaired loans, Average Recorded Investment 1,812 2,489
Total impaired loans, Interest Income Recognized 36 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 11,102 10,976
Impaired loans with no related allowance, Interest Income Recognized 441 575
Impaired loans with an allowance recorded, Recorded Investment 0 0
Impaired loans with an allowance recorded, Unpaid Principal Balance 0 0
Impaired loans with an allowance recorded, Related Allowance 0 0
Impaired loans with an allowance recorded, Interest Income Recognized 0 0
Total impaired loans, Recorded Investment 9,552 15,752
Total impaired loans, Unpaid Principal Balance 10,452 25,952
Total impaired loans, Related Allowance 0 0
Total impaired loans, Average Recorded Investment 11,102 10,976
Total impaired loans, Interest Income Recognized 441 575
Other loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 43,486 48,810
Impaired loans with no related allowance, Unpaid Principal Balance 107,101 104,901
Impaired loans with no related allowance, Average Recorded Investment 46,092 43,074
Impaired loans with no related allowance, Interest Income Recognized 2,428 2,200
Impaired loans with an allowance recorded, Recorded Investment 0 0
Impaired loans with an allowance recorded, Unpaid Principal Balance 0 0
Impaired loans with an allowance recorded, Related Allowance 0 0
Impaired loans with an allowance recorded, Average Recorded Investment 20 314
Impaired loans with an allowance recorded, Interest Income Recognized 0 0
Total impaired loans, Recorded Investment 43,486 48,810
Total impaired loans, Unpaid Principal Balance 107,101 104,901
Total impaired loans, Related Allowance 0 0
Total impaired loans, Average Recorded Investment 46,112 43,388
Total impaired loans, Interest Income Recognized $ 2,428 $ 2,200