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Loans Receivable and Allowance for Credit Losses on Loans (Summary of Loans Receivable by Credit Quality Risk Rating Indicator) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 7,372,044 $ 7,332,885
Total gross loans 7,376,284 7,337,564
2020 272,595  
2019 1,235,369  
2018 1,007,462  
2017 955,700  
2016 and prior 3,905,158  
Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 220,972 218,056
2020 0  
2019 1,459  
2018 5,413  
2017 13,251  
2016 and prior 200,849  
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 139,442 128,694
2020 0  
2019 1,231  
2018 4,656  
2017 3,424  
2016 and prior 130,131  
Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 80,798 88,526
2020 0  
2019 228  
2018 757  
2017 9,827  
2016 and prior 69,986  
Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 732 836
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 732  
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 7,155,312 7,119,508
2020 272,595  
2019 1,233,910  
2018 1,002,049  
2017 942,449  
2016 and prior 3,704,309  
Mortgage Portfolio Segment    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 5,293,018 5,311,445
2020 204,287  
2019 946,546  
2018 758,018  
2017 698,919  
2016 and prior 2,685,248  
Mortgage Portfolio Segment | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 52,000 79,003
2020 0  
2019 0  
2018 0  
2017 1,783  
2016 and prior 50,217  
Mortgage Portfolio Segment | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 23,923 49,160
2020 0  
2019 0  
2018 0  
2017 220  
2016 and prior 23,703  
Mortgage Portfolio Segment | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 28,077 29,843
2020 0  
2019 0  
2018 0  
2017 1,563  
2016 and prior 26,514  
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 5,241,018 5,232,442
2020 204,287  
2019 946,546  
2018 758,018  
2017 697,136  
2016 and prior 2,635,031  
Mortgage Portfolio Segment | Residential    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,106,670 1,077,689
2020 67,775  
2019 155,718  
2018 96,683  
2017 93,039  
2016 and prior 693,455  
Mortgage Portfolio Segment | Residential | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 13,125 12,606
2020 0  
2019 0  
2018 0  
2017 568  
2016 and prior 12,557  
Mortgage Portfolio Segment | Residential | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,075 2,402
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 4,075  
Mortgage Portfolio Segment | Residential | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 9,050 10,204
2020 0  
2019 0  
2018 0  
2017 568  
2016 and prior 8,482  
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 1,093,545 1,065,083
2020 67,775  
2019 155,718  
2018 96,683  
2017 92,471  
2016 and prior 680,898  
Mortgage Portfolio Segment | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 2,555,091 2,578,393
2020 99,722  
2019 505,804  
2018 357,530  
2017 400,322  
2016 and prior 1,191,713  
Mortgage Portfolio Segment | Commercial | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 32,570 60,216
2020 0  
2019 0  
2018 0  
2017 1,215  
2016 and prior 31,355  
Mortgage Portfolio Segment | Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 19,848 46,758
2020 0  
2019 0  
2018 0  
2017 220  
2016 and prior 19,628  
Mortgage Portfolio Segment | Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 12,722 13,458
2020 0  
2019 0  
2018 0  
2017 995  
2016 and prior 11,727  
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 2,522,521 2,518,177
2020 99,722  
2019 505,804  
2018 357,530  
2017 399,107  
2016 and prior 1,160,358  
Mortgage Portfolio Segment | Multi-Family    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,222,313 1,225,551
2020 34,785  
2019 141,727  
2018 115,282  
2017 136,620  
2016 and prior 793,899  
Mortgage Portfolio Segment | Multi-Family | Total classified and criticized    
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 | Special Mention    
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 | 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  
2019  
2018  
2017  
2016 and prior  
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 1,222,189 1,225,551
2020 34,785  
2019 141,727  
2018 115,282  
2017 136,620  
2016 and prior 793,775  
Mortgage Portfolio Segment | Construction    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 408,944 429,812
2020 2,005  
2019 143,297  
2018 188,523  
2017 68,938  
2016 and prior 6,181  
Mortgage Portfolio Segment | Construction | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 6,181 6,181
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 6,181  
Mortgage Portfolio Segment | Construction | Special Mention    
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 | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 6,181 6,181
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 6,181  
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 402,763 423,631
2020 2,005  
2019 143,297  
2018 188,523  
2017 68,938  
2016 and prior 0  
Commercial Loans    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,703,669 1,634,759
2020 59,721  
2019 232,924  
2018 201,241  
2017 218,724  
2016 and prior 991,059  
Commercial Loans | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 167,279 137,099
2020 0  
2019 1,459  
2018 5,413  
2017 11,468  
2016 and prior 148,939  
Commercial Loans | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 114,858 79,248
2020 0  
2019 1,231  
2018 4,656  
2017 3,204  
2016 and prior 105,767  
Commercial Loans | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 51,689 57,015
2020 0  
2019 228  
2018 757  
2017 8,264  
2016 and prior 42,440  
Commercial Loans | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 732 836
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 732  
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 1,536,390 1,497,660
2020 59,721  
2019 231,465  
2018 195,828  
2017 207,256  
2016 and prior 842,120  
Consumer Loans    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 379,597 391,360
2020 8,587  
2019 55,899  
2018 48,203  
2017 38,057  
2016 and prior 228,851  
Consumer Loans | Total classified and criticized    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,693 1,954
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 1,693  
Consumer Loans | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 661 286
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 661  
Consumer Loans | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,032 1,668
2020 0  
2019 0  
2018 0  
2017 0  
2016 and prior 1,032  
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 377,904 $ 389,406
2020 8,587  
2019 55,899  
2018 48,203  
2017 38,057  
2016 and prior $ 227,158