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Loans - Information about Company's TDRs (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 2,243 $ 1,362
Past Due Greater Than 30 Days 135 44
Nonaccrual TDRs 9,805 14,449
Total TDRs 12,183 15,855
Real estate loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 2,131 1,287
Past Due Greater Than 30 Days 135 44
Nonaccrual TDRs 8,061 13,173
Total TDRs 10,327 14,504
Real estate loans | One- to four-family first mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,036 432
Past Due Greater Than 30 Days 82 0
Nonaccrual TDRs 1,987 2,567
Total TDRs 3,105 2,999
Real estate loans | Home equity loans and lines    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 235 0
Past Due Greater Than 30 Days 53 44
Nonaccrual TDRs 56 631
Total TDRs 344 675
Real estate loans | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 760 722
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 6,018 9,975
Total TDRs 6,778 10,697
Real estate loans | Construction and land    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 100 133
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 0 0
Total TDRs 100 133
Real estate loans | Multi-family residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 0 0
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 0 0
Total TDRs 0 0
Other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 112 75
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 1,744 1,276
Total TDRs 1,856 1,351
Other loans | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 0 68
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 1,665 1,164
Total TDRs 1,665 1,232
Other loans | Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 112 7
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 79 112
Total TDRs 191 119
Originated loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,768 1,073
Past Due Greater Than 30 Days 135 44
Nonaccrual TDRs 7,587 10,279
Total TDRs 9,490 11,396
Originated loans | Real estate loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,676 1,073
Past Due Greater Than 30 Days 135 44
Nonaccrual TDRs 7,230 9,778
Total TDRs 9,041 10,895
Originated loans | Real estate loans | One- to four-family first mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 671 218
Past Due Greater Than 30 Days 82 0
Nonaccrual TDRs 1,370 1,920
Total TDRs 2,123 2,138
Originated loans | Real estate loans | Home equity loans and lines    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 235 0
Past Due Greater Than 30 Days 53 44
Nonaccrual TDRs 36 565
Total TDRs 324 609
Originated loans | Real estate loans | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 670 722
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 5,824 7,293
Total TDRs 6,494 8,015
Originated loans | Real estate loans | Construction and land    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 100 133
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 0 0
Total TDRs 100 133
Originated loans | Real estate loans | Multi-family residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 0 0
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 0 0
Total TDRs 0 0
Originated loans | Other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 92 0
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 357 501
Total TDRs 449 501
Originated loans | Other loans | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 0 0
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 303 424
Total TDRs 303 424
Originated loans | Other loans | Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 92 0
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 54 77
Total TDRs 146 77
Acquired loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 475 289
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 2,218 4,170
Total TDRs 2,693 4,459
Acquired loans | Real estate loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 455 214
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 831 3,395
Total TDRs 1,286 3,609
Acquired loans | Real estate loans | One- to four-family first mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 365 214
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 617 647
Total TDRs 982 861
Acquired loans | Real estate loans | Home equity loans and lines    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 0 0
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 20 66
Total TDRs 20 66
Acquired loans | Real estate loans | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 90 0
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 194 2,682
Total TDRs 284 2,682
Acquired loans | Real estate loans | Construction and land    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 0 0
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 0 0
Total TDRs 0 0
Acquired loans | Real estate loans | Multi-family residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 0 0
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 0 0
Total TDRs 0 0
Acquired loans | Other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 20 75
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 1,387 775
Total TDRs 1,407 850
Acquired loans | Other loans | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 0 68
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 1,362 740
Total TDRs 1,362 808
Acquired loans | Other loans | Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 20 7
Past Due Greater Than 30 Days 0 0
Nonaccrual TDRs 25 35
Total TDRs $ 45 $ 42