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Loans Receivable and Allowance for Credit Losses (Summary of Impaired Loans Receivable by Class) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Loans with no related allowance      
Loans with no related allowance, Unpaid Principal Balance   $ 43,042 $ 19,491
Loans with no related allowance, Recorded Investment   37,692 15,952
Loans with no related allowance, Average Recorded Investment   39,463 16,416
Loans with no related allowance, Interest Income Recognized   885 636
Loans with an allowance recorded      
Loans with an allowance recorded, Unpaid Principal Balance   30,351 58,335
Loans with an allowance recorded, Recorded Investment   28,117 54,689
Loans with an allowance recorded, Average Recorded Investment   31,102 57,721
Loans with an allowance recorded, Interest Income Recognized   582 1,487
Total impaired loans      
Unpaid Principal Balance   73,393 77,826
Recorded Investment   65,809 70,641
Related Allowance   3,300 5,067
Average Recorded Investment $ 74,100 70,565 74,137
Interest Income Recognized   1,467 2,123
Mortgage Portfolio Segment      
Loans with no related allowance      
Loans with no related allowance, Unpaid Principal Balance   33,687 13,478
Loans with no related allowance, Recorded Investment   31,084 10,739
Loans with no related allowance, Average Recorded Investment   31,242 10,910
Loans with no related allowance, Interest Income Recognized   817 533
Loans with an allowance recorded      
Loans with an allowance recorded, Unpaid Principal Balance   12,732 29,705
Loans with an allowance recorded, Recorded Investment   12,313 29,171
Loans with an allowance recorded, Average Recorded Investment   12,262 29,316
Loans with an allowance recorded, Interest Income Recognized   276 997
Total impaired loans      
Unpaid Principal Balance   46,419 43,183
Recorded Investment   43,397 39,910
Related Allowance   1,391 1,580
Average Recorded Investment   43,504 40,226
Interest Income Recognized   1,093 1,530
Mortgage Portfolio Segment | Residential      
Loans with no related allowance      
Loans with no related allowance, Unpaid Principal Balance   14,144 13,478
Loans with no related allowance, Recorded Investment   11,541 10,739
Loans with no related allowance, Average Recorded Investment   11,694 10,910
Loans with no related allowance, Interest Income Recognized   386 533
Loans with an allowance recorded      
Loans with an allowance recorded, Unpaid Principal Balance   7,922 10,860
Loans with an allowance recorded, Recorded Investment   7,503 10,326
Loans with an allowance recorded, Average Recorded Investment   7,440 10,454
Loans with an allowance recorded, Interest Income Recognized   235 428
Total impaired loans      
Unpaid Principal Balance   22,066 24,338
Recorded Investment   19,044 21,065
Related Allowance   728 829
Average Recorded Investment   19,134 21,364
Interest Income Recognized   621 961
Mortgage Portfolio Segment | Commercial      
Loans with no related allowance      
Loans with no related allowance, Unpaid Principal Balance   19,543 0
Loans with no related allowance, Recorded Investment   19,543 0
Loans with no related allowance, Average Recorded Investment   19,548 0
Loans with no related allowance, Interest Income Recognized   431 0
Loans with an allowance recorded      
Loans with an allowance recorded, Unpaid Principal Balance   4,810 18,845
Loans with an allowance recorded, Recorded Investment   4,810 18,845
Loans with an allowance recorded, Average Recorded Investment   4,822 18,862
Loans with an allowance recorded, Interest Income Recognized   41 569
Total impaired loans      
Unpaid Principal Balance   24,353 18,845
Recorded Investment   24,353 18,845
Related Allowance   663 751
Average Recorded Investment   24,370 18,862
Interest Income Recognized   472 569
Commercial Loans      
Loans with no related allowance      
Loans with no related allowance, Unpaid Principal Balance   7,959 3,927
Loans with no related allowance, Recorded Investment   5,713 3,696
Loans with no related allowance, Average Recorded Investment   7,300 4,015
Loans with no related allowance, Interest Income Recognized   29 17
Loans with an allowance recorded      
Loans with an allowance recorded, Unpaid Principal Balance   17,050 27,762
Loans with an allowance recorded, Recorded Investment   15,250 24,661
Loans with an allowance recorded, Average Recorded Investment   18,280 27,527
Loans with an allowance recorded, Interest Income Recognized   293 444
Total impaired loans      
Unpaid Principal Balance   25,009 31,689
Recorded Investment   20,963 28,357
Related Allowance   1,876 3,462
Average Recorded Investment   25,580 31,542
Interest Income Recognized   322 461
Consumer Loans      
Loans with no related allowance      
Loans with no related allowance, Unpaid Principal Balance   1,396 2,086
Loans with no related allowance, Recorded Investment   895 1,517
Loans with no related allowance, Average Recorded Investment   921 1,491
Loans with no related allowance, Interest Income Recognized   39 86
Loans with an allowance recorded      
Loans with an allowance recorded, Unpaid Principal Balance   569 868
Loans with an allowance recorded, Recorded Investment   554 857
Loans with an allowance recorded, Average Recorded Investment   560 878
Loans with an allowance recorded, Interest Income Recognized   13 46
Total impaired loans      
Unpaid Principal Balance   1,965 2,954
Recorded Investment   1,449 2,374
Related Allowance   33 25
Average Recorded Investment   1,481 2,369
Interest Income Recognized   $ 52 $ 132