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Additional Information about Impaired Loans (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 44,907,000 $ 56,936,000
Impaired loans with no related allowance, Unpaid Principal Balance   143,149,000
Impaired loans with no related allowance, Average Recorded Investment   54,393,000
Impaired loans with no related allowance, Interest Income Recognized 644,000 3,516,000
Impaired loans with an allowance recorded, Recorded Investment 4,375,000 1,445,000
Impaired loans with an allowance recorded, Unpaid Principal Balance   4,173,000
Impaired loans with an allowance recorded, Related Allowance 384,000 116,000
Impaired loans with an allowance recorded, Average Recorded Investment   4,111,000
Impaired loans with an allowance recorded, Interest Income Recognized 18,000 13,000
Total impaired loans, Recorded Investment 49,282,000 58,381,000
Total impaired loans, Unpaid Principal Balance   147,322
Total impaired loans, Related Allowance 384,000 116,000
Total impaired loans, Average Recorded Investment   58,504,000
Total impaired loans, Interest Income Recognized 662,000 3,529,000
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 2,412,000 3,577,000
Impaired loans with no related allowance, Unpaid Principal Balance   6,790,000
Impaired loans with no related allowance, Average Recorded Investment   4,336,000
Impaired loans with no related allowance, Interest Income Recognized 64,000 266,000
Impaired loans with an allowance recorded, Recorded Investment 1,830,000  
Impaired loans with an allowance recorded, Related Allowance 264,000  
Total impaired loans, Recorded Investment 4,242,000 3,577,000
Total impaired loans, Unpaid Principal Balance   6,790
Total impaired loans, Related Allowance 264,000  
Total impaired loans, Average Recorded Investment   4,336,000
Total impaired loans, Interest Income Recognized 64,000 266,000
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 14,700,000 14,717,000
Impaired loans with no related allowance, Unpaid Principal Balance   19,832,000
Impaired loans with no related allowance, Average Recorded Investment   6,140,000
Impaired loans with no related allowance, Interest Income Recognized 24,000 371,000
Impaired loans with an allowance recorded, Recorded Investment 1,401,000  
Impaired loans with an allowance recorded, Related Allowance 110,000  
Impaired loans with an allowance recorded, Interest Income Recognized 15,000  
Total impaired loans, Recorded Investment 16,101,000 14,717,000
Total impaired loans, Unpaid Principal Balance   19,832
Total impaired loans, Related Allowance 110,000  
Total impaired loans, Average Recorded Investment   6,140,000
Total impaired loans, Interest Income Recognized 39,000 371,000
One-to-four family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 577,000 584,000
Impaired loans with no related allowance, Unpaid Principal Balance   602,000
Impaired loans with no related allowance, Average Recorded Investment   811,000
Impaired loans with no related allowance, Interest Income Recognized 5,000 21,000
Impaired loans with an allowance recorded, Recorded Investment 1,144,000  
Impaired loans with an allowance recorded, Related Allowance 10,000  
Impaired loans with an allowance recorded, Interest Income Recognized 3,000  
Total impaired loans, Recorded Investment 1,721,000 584,000
Total impaired loans, Unpaid Principal Balance   602,000
Total impaired loans, Related Allowance 10,000  
Total impaired loans, Average Recorded Investment   811,000
Total impaired loans, Interest Income Recognized 8,000 21,000
Acquisition, development, and construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment   389,000
Impaired loans with no related allowance, Unpaid Principal Balance   1,289,000
Impaired loans with no related allowance, Average Recorded Investment   3,508,000
Impaired loans with no related allowance, Interest Income Recognized   364,000
Total impaired loans, Recorded Investment   389,000
Total impaired loans, Unpaid Principal Balance   1,289
Total impaired loans, Average Recorded Investment   3,508,000
Total impaired loans, Interest Income Recognized   364,000
Other    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 27,218,000 37,669,000
Impaired loans with no related allowance, Unpaid Principal Balance   114,636,000
Impaired loans with no related allowance, Average Recorded Investment   39,598,000
Impaired loans with no related allowance, Interest Income Recognized 551,000 2,494,000
Impaired loans with an allowance recorded, Recorded Investment   1,445,000
Impaired loans with an allowance recorded, Unpaid Principal Balance   4,173,000
Impaired loans with an allowance recorded, Related Allowance   116,000
Impaired loans with an allowance recorded, Average Recorded Investment   4,111,000
Impaired loans with an allowance recorded, Interest Income Recognized   13,000
Total impaired loans, Recorded Investment 27,218,000 39,114,000
Total impaired loans, Unpaid Principal Balance   118,809
Total impaired loans, Related Allowance   116,000
Total impaired loans, Average Recorded Investment   43,709,000
Total impaired loans, Interest Income Recognized $ 551,000 $ 2,507,000