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Additional Information about Impaired Loans (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 57,105 $ 52,169
Impaired loans with no related allowance, Unpaid Principal Balance 144,392 126,513
Impaired loans with no related allowance, Average Recorded Investment 53,546 63,146
Impaired loans with no related allowance, Interest Income Recognized 3,109 4,013
Impaired loans with an allowance recorded, Average Recorded Investment 5,000 20
Total impaired loans, Recorded Investment 57,105 52,169
Total impaired loans, Unpaid Principal Balance 144,392 126,513
Total impaired loans, Average Recorded Investment 58,546 63,166
Total impaired loans, Interest Income Recognized 3,109 4,013
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 5,793 4,220
Impaired loans with no related allowance, Unpaid Principal Balance 9,375 7,168
Impaired loans with no related allowance, Average Recorded Investment 4,590 6,114
Impaired loans with no related allowance, Interest Income Recognized 317 340
Total impaired loans, Recorded Investment 5,793 4,220
Total impaired loans, Unpaid Principal Balance 9,375 7,168
Total impaired loans, Average Recorded Investment 4,590 6,114
Total impaired loans, Interest Income Recognized 317 340
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 5,330 2,256
Impaired loans with no related allowance, Unpaid Principal Balance 10,445 7,371
Impaired loans with no related allowance, Average Recorded Investment 3,280 3,234
Impaired loans with no related allowance, Interest Income Recognized 83  
Total impaired loans, Recorded Investment 5,330 2,256
Total impaired loans, Unpaid Principal Balance 10,445 7,371
Total impaired loans, Average Recorded Investment 3,280 3,234
Total impaired loans, Interest Income Recognized 83  
One-to-four family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 891 1,022
Impaired loans with no related allowance, Unpaid Principal Balance 909 1,076
Impaired loans with no related allowance, Average Recorded Investment 887 1,576
Impaired loans with no related allowance, Interest Income Recognized 20 26
Total impaired loans, Recorded Investment 891 1,022
Total impaired loans, Unpaid Principal Balance 909 1,076
Total impaired loans, Average Recorded Investment 887 1,576
Total impaired loans, Interest Income Recognized 20 26
Acquisition, development, and construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 2,349 8,296
Impaired loans with no related allowance, Unpaid Principal Balance 3,249 9,197
Impaired loans with no related allowance, Average Recorded Investment 4,548 9,238
Impaired loans with no related allowance, Interest Income Recognized 324 590
Total impaired loans, Recorded Investment 2,349 8,296
Total impaired loans, Unpaid Principal Balance 3,249 9,197
Total impaired loans, Average Recorded Investment 4,548 9,238
Total impaired loans, Interest Income Recognized 324 590
Other    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 42,742 36,375
Impaired loans with no related allowance, Unpaid Principal Balance 120,414 101,701
Impaired loans with no related allowance, Average Recorded Investment 40,241 42,984
Impaired loans with no related allowance, Interest Income Recognized 2,365 3,057
Impaired loans with an allowance recorded, Average Recorded Investment 5,000 20
Total impaired loans, Recorded Investment 42,742 36,375
Total impaired loans, Unpaid Principal Balance 120,414 101,701
Total impaired loans, Average Recorded Investment 45,241 43,004
Total impaired loans, Interest Income Recognized $ 2,365 $ 3,057