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Loans- Schedule of Activity in Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       $ 16,348       $ 14,807 $ 16,348 $ 14,807 $ 12,511
Charge-offs                 (1,577) (2,581) (464)
Recoveries                 83 179 443
Provision for loan losses $ 713 $ 1,146 $ 765 390 $ 1,612 $ 786 $ 581 964 3,014 3,943 2,317
Ending Balance 17,868       16,348       17,868 16,348 14,807
Originated loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       14,860       14,303 14,860 14,303 12,220
Charge-offs                 (1,428) (2,581) (464)
Recoveries                 83 179 443
Provision for loan losses                 2,576 2,959 2,104
Ending Balance 16,091       14,860       16,091 14,860 14,303
Acquired loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       1,488       504 1,488 504 291
Charge-offs                 (149) 0 0
Recoveries                 0 0 0
Provision for loan losses                 438 984 213
Ending Balance 1,777       1,488       1,777 1,488 504
One- to four-family first mortgage                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       2,136       1,663 2,136 1,663 1,511
Charge-offs                 (4) (1) (29)
Recoveries                 0 0 0
Provision for loan losses                 583 474 181
Ending Balance 2,715       2,136       2,715 2,136 1,663
One- to four-family first mortgage | Originated loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       1,937       1,574 1,937 1,574 1,436
Charge-offs                 (4) (1) (29)
Recoveries                 0 0 0
Provision for loan losses                 113 364 167
Ending Balance 2,046       1,937       2,046 1,937 1,574
One- to four-family first mortgage | Acquired loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       199       89 199 89 75
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 470 110 14
Ending Balance 669       199       669 199 89
Home equity loans and lines                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       1,079       1,102 1,079 1,102 728
Charge-offs                 (42) 0 (10)
Recoveries                 16 5 20
Provision for loan losses                 31 (28) 364
Ending Balance 1,084       1,079       1,084 1,079 1,102
Home equity loans and lines | Originated loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       1,031       1,024 1,031 1,024 654
Charge-offs                 (42) 0 (10)
Recoveries                 16 5 20
Provision for loan losses                 49 2 360
Ending Balance 1,054       1,031       1,054 1,031 1,024
Home equity loans and lines | Acquired loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       48       78 48 78 74
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 (18) (30) 4
Ending Balance 30       48       30 48 78
Commercial real estate                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       6,125       4,906 6,125 4,906 4,177
Charge-offs                 (360) 0 (3)
Recoveries                 0 0 0
Provision for loan losses                 776 1,219 732
Ending Balance 6,541       6,125       6,541 6,125 4,906
Commercial real estate | Originated loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       5,756       4,766 5,756 4,766 4,177
Charge-offs                 (360) 0 (3)
Recoveries                 0 0 0
Provision for loan losses                 785 990 592
Ending Balance 6,181       5,756       6,181 5,756 4,766
Commercial real estate | Acquired loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       369       140 369 140 0
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 (9) 229 140
Ending Balance 360       369       360 369 140
Construction and land                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       2,285       1,749 2,285 1,749 1,782
Charge-offs                 (6) 0 0
Recoveries                 0 0 0
Provision for loan losses                 391 536 (33)
Ending Balance 2,670       2,285       2,670 2,285 1,749
Construction and land | Originated loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       2,280       1,742 2,280 1,742 1,763
Charge-offs                 (6) 0 0
Recoveries                 0 0 0
Provision for loan losses                 146 538 (21)
Ending Balance 2,420       2,280       2,420 2,280 1,742
Construction and land | Acquired loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       5       7 5 7 19
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 245 (2) (12)
Ending Balance 250       5       250 5 7
Multi-family residential                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       550       355 550 355 361
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 22 195 (6)
Ending Balance 572       550       572 550 355
Multi-family residential | Originated loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       522       355 522 355 361
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 50 167 (6)
Ending Balance 572       522       572 522 355
Multi-family residential | Acquired loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       28       0 28 0 0
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 (28) 28 0
Ending Balance 0       28       0 28 0
Commercial and industrial                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       3,228       4,530 3,228 4,530 3,439
Charge-offs                 (893) (2,506) (358)
Recoveries                 25 158 408
Provision for loan losses                 1,334 1,046 1,041
Ending Balance 3,694       3,228       3,694 3,228 4,530
Commercial and industrial | Originated loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       2,862       4,346 2,862 4,346 3,316
Charge-offs                 (888) (2,506) (358)
Recoveries                 25 158 408
Provision for loan losses                 1,373 864 980
Ending Balance 3,372       2,862       3,372 2,862 4,346
Commercial and industrial | Acquired loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       366       184 366 184 123
Charge-offs                 (5) 0 0
Recoveries                 0 0 0
Provision for loan losses                 (39) 182 61
Ending Balance 322       366       322 366 184
Consumer                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       945       502 945 502 513
Charge-offs                 (272) (74) (64)
Recoveries                 42 16 15
Provision for loan losses                 (123) 501 38
Ending Balance 592       945       592 945 502
Consumer | Originated loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       472       496 472 496 513
Charge-offs                 (128) (74) (64)
Recoveries                 42 16 15
Provision for loan losses                 60 34 32
Ending Balance 446       472       446 472 496
Consumer | Acquired loans                      
Financing Receivable, Allowance for Credit Loss [Roll Forward]                      
Beginning Balance       $ 473       $ 6 473 6 0
Charge-offs                 (144) 0 0
Recoveries                 0 0 0
Provision for loan losses                 (183) 467 6
Ending Balance $ 146       $ 473       $ 146 $ 473 $ 6