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Loans Receivable, Net - Recorded Investment in Residential and Consumer Loans Based on Payment Activity Excluding PCI Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]    
Non-performing $ 17,453 $ 17,415
Total loans 6,076,852 5,579,812
Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Non-performing 5,953 7,389
Total loans 2,234,026 2,044,286
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Non-performing 2,683 2,914
Total loans 429,205 474,947
Residential Real Estate | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Performing 2,228,073 2,036,897
Non-performing 5,953 7,389
Total loans 2,234,026 2,044,286
Residential Real Estate | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Performing 426,522 472,033
Non-performing 2,683 2,914
Total loans $ 429,205 $ 474,947