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Loans Receivable and Allowance for Credit Losses (Summary of Loans Receivable by Credit Quality Risk Rating Indicator) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 9,756,809 $ 7,332,885
Total gross loans 9,774,593  
2020 1,450,015  
2019 1,293,866  
2018 968,609  
2017 882,748  
2016 and prior 5,489,913  
Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 430,133 218,056
2020 3,633  
2019 30,348  
2018 25,312  
2017 60,282  
2016 and prior 310,558  
Criticized and classified loans, gross 310,800  
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 229,019 128,694
2020 1,529  
2019 20,942  
2018 17,856  
2017 31,465  
2016 and prior 157,227  
Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 201,038 88,526
2020 2,104  
2019 9,406  
2018 7,456  
2017 28,817  
2016 and prior 153,255  
Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 76 836
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 76  
Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 9,344,460 7,119,508
2020 1,446,382  
2019 1,263,518  
2018 943,297  
2017 822,466  
2016 and prior 5,179,355  
Mortgage Portfolio Segment    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 7,077,946 5,311,445
2020 835,218  
2019 1,011,834  
2018 741,496  
2017 661,151  
2016 and prior 3,928,976  
Mortgage Portfolio Segment | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 154,050 79,003
2020 2,951  
2019 20,508  
2018 9,100  
2017 20,762  
2016 and prior 100,729  
Mortgage Portfolio Segment | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 59,824 49,160
2020 872  
2019 14,187  
2018 6,948  
2017 0  
2016 and prior 37,817  
Mortgage Portfolio Segment | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 94,226 29,843
2020 2,079  
2019 6,321  
2018 2,152  
2017 20,762  
2016 and prior 62,912  
Mortgage Portfolio Segment | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 6,923,896 5,232,442
2020 832,267  
2019 991,326  
2018 732,396  
2017 640,389  
2016 and prior 3,828,247  
Mortgage Portfolio Segment | Residential    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,320,222  
2020 200,801  
2019 147,465  
2018 82,022  
2017 84,046  
2016 and prior 835,770  
Mortgage Portfolio Segment | Residential | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 45,738 12,606
2020 2,079  
2019 8,074  
2018 2,470  
2017 3,233  
2016 and prior 29,882  
Mortgage Portfolio Segment | Residential | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,483 2,402
2020 0  
2019 1,753  
2018 318  
2017 0  
2016 and prior 2,412  
Mortgage Portfolio Segment | Residential | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 41,255 10,204
2020 2,079  
2019 6,321  
2018 2,152  
2017 3,233  
2016 and prior 27,470  
Mortgage Portfolio Segment | Residential | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Residential | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Residential | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,274,484 1,065,083
2020 198,722  
2019 139,391  
2018 79,552  
2017 80,813  
2016 and prior 805,888  
Mortgage Portfolio Segment | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 3,750,639  
2020 375,324  
2019 560,403  
2018 367,939  
2017 405,375  
2016 and prior 2,112,220  
Mortgage Portfolio Segment | Commercial | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 107,215 60,216
2020 0  
2019 12,434  
2018 6,630  
2017 17,529  
2016 and prior 70,622  
Mortgage Portfolio Segment | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 54,368 46,758
2020 0  
2019 12,434  
2018 6,630  
2017 0  
2016 and prior 35,304  
Mortgage Portfolio Segment | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 52,847 13,458
2020 0  
2019 0  
2018 0  
2017 17,529  
2016 and prior 35,318  
Mortgage Portfolio Segment | Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Commercial | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Commercial | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,643,424 2,518,177
2020 375,324  
2019 547,969  
2018 361,309  
2017 387,846  
2016 and prior 2,041,598  
Mortgage Portfolio Segment | Multi-Family    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,544,924  
2020 230,034  
2019 139,633  
2018 171,555  
2017 134,166  
2016 and prior 869,761  
Mortgage Portfolio Segment | Multi-Family | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 225 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 225  
Mortgage Portfolio Segment | Multi-Family | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 101 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 101  
Mortgage Portfolio Segment | Multi-Family | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 124 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 124  
Mortgage Portfolio Segment | Multi-Family | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Multi-Family | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Multi-Family | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,544,699 1,225,551
2020 230,034  
2019 139,633  
2018 171,555  
2017 134,166  
2016 and prior 869,536  
Mortgage Portfolio Segment | Construction    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 462,161  
2020 29,059  
2019 164,333  
2018 119,980  
2017 37,564  
2016 and prior 111,225  
Mortgage Portfolio Segment | Construction | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 872 6,181
2020 872  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Construction | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 872 0
2020 872  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Construction | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 6,181
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Construction | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Construction | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Mortgage Portfolio Segment | Construction | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 461,289 423,631
2020 28,187  
2019 164,333  
2018 119,980  
2017 37,564  
2016 and prior 111,225  
Commercial Loans    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 2,290,196 1,634,759
2020 587,167  
2019 234,944  
2018 185,830  
2017 188,242  
2016 and prior 1,300,539  
Commercial Loans | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 272,041 137,099
2020 657  
2019 9,497  
2018 15,856  
2017 39,505  
2016 and prior 206,526  
Commercial Loans | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 168,833 79,248
2020 657  
2019 6,755  
2018 10,908  
2017 31,465  
2016 and prior 119,048  
Commercial Loans | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 103,132 57,015
2020 0  
2019 2,742  
2018 4,948  
2017 8,040  
2016 and prior 87,402  
Commercial Loans | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 76 836
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 76  
Commercial Loans | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Commercial Loans | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,018,155 1,497,660
2020 586,510  
2019 225,447  
2018 169,974  
2017 148,737  
2016 and prior 1,094,013  
Consumer Loans    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 406,451  
2020 27,630  
2019 47,088  
2018 41,283  
2017 33,355  
2016 and prior 260,398  
Consumer Loans | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,042 1,954
2020 25  
2019 343  
2018 356  
2017 15  
2016 and prior 3,303  
Consumer Loans | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 362 286
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 362  
Consumer Loans | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,680 1,668
2020 25  
2019 343  
2018 356  
2017 15  
2016 and prior 2,941  
Consumer Loans | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Consumer Loans | Loss    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 0  
Consumer Loans | Pass/Watch    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 402,409 $ 389,406
2020 27,605  
2019 46,745  
2018 40,927  
2017 33,340  
2016 and prior $ 257,095