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Additional Information about Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 48,612 $ 52,169
Impaired loans with no related allowance, Unpaid Principal Balance 122,721 126,513
Impaired loans with no related allowance, Average Recorded Investment 50,390 63,146
Impaired loans with no related allowance, Interest Income Recognized 906 4,013
Impaired loans with an allowance recorded, Recorded Investment 15,000  
Impaired loans with an allowance recorded, Unpaid Principal Balance 15,000  
Impaired loans with an allowance recorded, Related Allowance 709  
Impaired loans with an allowance recorded, Average Recorded Investment 15,000 20
Impaired loans with an allowance recorded, Interest Income Recognized 75  
Total impaired loans, Recorded Investment 63,612 52,169
Total impaired loans, Unpaid Principal Balance 137,721 126,513
Total impaired loans, Related Allowance 709  
Total impaired loans, Average Recorded Investment 65,390 63,166
Total impaired loans, Interest Income Recognized 981 4,013
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 4,070 4,220
Impaired loans with no related allowance, Unpaid Principal Balance 7,075 7,168
Impaired loans with no related allowance, Average Recorded Investment 4,145 6,114
Impaired loans with no related allowance, Interest Income Recognized 57 340
Total impaired loans, Recorded Investment 4,070 4,220
Total impaired loans, Unpaid Principal Balance 7,075 7,168
Total impaired loans, Average Recorded Investment 4,145 6,114
Total impaired loans, Interest Income Recognized 57 340
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 2,256 2,256
Impaired loans with no related allowance, Unpaid Principal Balance 7,370 7,371
Impaired loans with no related allowance, Average Recorded Investment 2,256 3,234
Total impaired loans, Recorded Investment 2,256 2,256
Total impaired loans, Unpaid Principal Balance 7,370 7,371
Total impaired loans, Average Recorded Investment 2,256 3,234
One-to-four family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 1,012 1,022
Impaired loans with no related allowance, Unpaid Principal Balance 1,066 1,076
Impaired loans with no related allowance, Average Recorded Investment 1,017 1,576
Impaired loans with no related allowance, Interest Income Recognized 6 26
Total impaired loans, Recorded Investment 1,012 1,022
Total impaired loans, Unpaid Principal Balance 1,066 1,076
Total impaired loans, Average Recorded Investment 1,017 1,576
Total impaired loans, Interest Income Recognized 6 26
Acquisition, development, and construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 6,535 8,296
Impaired loans with no related allowance, Unpaid Principal Balance 7,435 9,197
Impaired loans with no related allowance, Average Recorded Investment 7,415 9,238
Impaired loans with no related allowance, Interest Income Recognized 144 590
Total impaired loans, Recorded Investment 6,535 8,296
Total impaired loans, Unpaid Principal Balance 7,435 9,197
Total impaired loans, Average Recorded Investment 7,415 9,238
Total impaired loans, Interest Income Recognized 144 590
Other    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 34,739 36,375
Impaired loans with no related allowance, Unpaid Principal Balance 99,775 101,701
Impaired loans with no related allowance, Average Recorded Investment 35,557 42,984
Impaired loans with no related allowance, Interest Income Recognized 699 3,057
Impaired loans with an allowance recorded, Recorded Investment 15,000  
Impaired loans with an allowance recorded, Unpaid Principal Balance 15,000  
Impaired loans with an allowance recorded, Related Allowance 709  
Impaired loans with an allowance recorded, Average Recorded Investment 15,000 20
Impaired loans with an allowance recorded, Interest Income Recognized 75  
Total impaired loans, Recorded Investment 49,739 36,375
Total impaired loans, Unpaid Principal Balance 114,775 101,701
Total impaired loans, Related Allowance 709  
Total impaired loans, Average Recorded Investment 50,057 43,004
Total impaired loans, Interest Income Recognized $ 774 $ 3,057