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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Risk Categories for Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 $ 816,955  
2019 840,484  
2018 880,048  
2017 457,039  
2016 503,551  
Prior 739,203  
Revolving Loans Amortized Cost Basis 1,640,519  
Revolving Loans Amortized Cost Basis Converted to Term 20,606  
Total 5,898,405 $ 5,951,885
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   5,782,383
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   67,531
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   99,836
Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   2,135
Commercial | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 99,015  
2019 93,648  
2018 79,258  
2017 65,390  
2016 46,110  
Prior 103,664  
Revolving Loans Amortized Cost Basis 1,586,357  
Revolving Loans Amortized Cost Basis Converted to Term 14,866  
Total 2,088,308 1,691,270
Commercial | Commercial and industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 99,015  
2019 78,783  
2018 70,248  
2017 52,786  
2016 44,536  
Prior 92,129  
Revolving Loans Amortized Cost Basis 1,572,259  
Revolving Loans Amortized Cost Basis Converted to Term 9,945  
Total 2,019,701 1,580,269
Commercial | Commercial and industrial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 928  
2018 2,748  
2017 7,986  
2016 1,574  
Prior 2,271  
Revolving Loans Amortized Cost Basis 1,500  
Revolving Loans Amortized Cost Basis Converted to Term 225  
Total 17,232 45,323
Commercial | Commercial and industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 13,937  
2018 6,262  
2017 4,618  
2016 0  
Prior 9,264  
Revolving Loans Amortized Cost Basis 12,598  
Revolving Loans Amortized Cost Basis Converted to Term 4,696  
Total 51,375 65,678
Commercial | Commercial and industrial | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 0 0
Commercial | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 75,432  
2019 150,731  
2018 202,283  
2017 63,144  
2016 93,972  
Prior 213,608  
Revolving Loans Amortized Cost Basis 6,443  
Revolving Loans Amortized Cost Basis Converted to Term 1,582  
Total 807,195 818,817
Commercial | Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 75,432  
2019 150,731  
2018 192,831  
2017 63,144  
2016 91,454  
Prior 182,756  
Revolving Loans Amortized Cost Basis 2,682  
Revolving Loans Amortized Cost Basis Converted to Term 1,582  
Total 760,612 813,846
Commercial | Commercial real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 9,452  
2017 0  
2016 2,518  
Prior 14,754  
Revolving Loans Amortized Cost Basis 3,761  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 30,485 2,532
Commercial | Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 16,098  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 16,098 2,439
Commercial | Commercial real estate | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 0 0
Commercial | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 239,449  
2019 409,582  
2018 275,881  
2017 110,105  
2016 97,160  
Prior 157,616  
Revolving Loans Amortized Cost Basis 27  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 1,289,820 1,494,528
Commercial | Multifamily | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 239,449  
2019 407,532  
2018 275,881  
2017 110,105  
2016 97,160  
Prior 154,841  
Revolving Loans Amortized Cost Basis 27  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 1,284,995 1,484,931
Commercial | Multifamily | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 2,050  
2018 0  
2017 0  
2016 0  
Prior 803  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 2,853 4,256
Commercial | Multifamily | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 1,972  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 1,972 5,341
Commercial | Multifamily | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 0 0
Commercial | SBA    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 211,962  
2019 15,850  
2018 1,650  
2017 5,277  
2016 12,184  
Prior 21,318  
Revolving Loans Amortized Cost Basis 3,337  
Revolving Loans Amortized Cost Basis Converted to Term 1,866  
Total 273,444 70,981
Commercial | SBA | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 211,962  
2019 14,082  
2018 1,260  
2017 3,746  
2016 11,087  
Prior 18,589  
Revolving Loans Amortized Cost Basis 3,111  
Revolving Loans Amortized Cost Basis Converted to Term 1,014  
Total 264,851 60,982
Commercial | SBA | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 1,768  
2018 0  
2017 212  
2016 415  
Prior 874  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 6  
Total 3,275 2,760
Commercial | SBA | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 1,319  
2016 682  
Prior 1,855  
Revolving Loans Amortized Cost Basis 226  
Revolving Loans Amortized Cost Basis Converted to Term 755  
Total 4,837 5,621
Commercial | SBA | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 390  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 91  
Total 481 1,618
Commercial | Construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 41,677  
2019 30,387  
2018 46,934  
2017 50,024  
2016 6,994  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 176,016 231,350
Commercial | Construction | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 41,677  
2019 30,387  
2018 45,397  
2017 50,024  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 167,485 229,771
Commercial | Construction | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 1,537  
2017 0  
2016 6,994  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 8,531 1,579
Commercial | Construction | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 0 0
Commercial | Construction | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 0 0
Consumer | Single family residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 149,382  
2019 140,286  
2018 273,995  
2017 163,099  
2016 247,131  
Prior 241,091  
Revolving Loans Amortized Cost Basis 15,252  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 1,230,236 1,590,774
Consumer | Single family residential mortgage | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 149,382  
2019 140,129  
2018 271,667  
2017 161,332  
2016 237,285  
Prior 227,711  
Revolving Loans Amortized Cost Basis 15,252  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 1,202,758 1,559,253
Consumer | Single family residential mortgage | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 1,837  
2017 688  
2016 4,868  
Prior 4,460  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 11,853 10,735
Consumer | Single family residential mortgage | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 157  
2018 491  
2017 1,079  
2016 4,978  
Prior 8,920  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 15,625 20,269
Consumer | Single family residential mortgage | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 0 517
Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 38  
2019 0  
2018 47  
2017 0  
2016 0  
Prior 1,906  
Revolving Loans Amortized Cost Basis 29,103  
Revolving Loans Amortized Cost Basis Converted to Term 2,292  
Total 33,386 54,165
Consumer | Other consumer | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 38  
2019 0  
2018 47  
2017 0  
2016 0  
Prior 1,876  
Revolving Loans Amortized Cost Basis 27,644  
Revolving Loans Amortized Cost Basis Converted to Term 2,218  
Total 31,823 53,331
Consumer | Other consumer | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 30  
Revolving Loans Amortized Cost Basis 1,185  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total 1,215 346
Consumer | Other consumer | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 274  
Revolving Loans Amortized Cost Basis Converted to Term 74  
Total 348 488
Consumer | Other consumer | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans Amortized Cost Basis 0  
Revolving Loans Amortized Cost Basis Converted to Term 0  
Total $ 0 $ 0