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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Risk Categories for Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 $ 102,579    
2019 975,341    
2018 1,151,357    
2017 738,222    
2016 678,265    
Prior 920,940    
Revolving Loans Amortized Cost Basis 1,078,526    
Revolving Loans Amortized Cost Basis Converted to Term 22,234    
Total 5,667,464 $ 5,951,885 $ 7,557,200
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  
Traditional Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 5,107,406 5,351,229  
Commercial | Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 17,714    
2019 145,790    
2018 113,932    
2017 69,779    
2016 65,760    
Prior 140,931    
Revolving Loans Amortized Cost Basis 1,009,041    
Revolving Loans Amortized Cost Basis Converted to Term 15,276    
Total 1,578,223 1,691,270 1,907,102
Commercial | Commercial and industrial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 15,168    
2019 121,892    
2018 112,591    
2017 69,585    
2016 44,205    
Prior 138,326    
Revolving Loans Amortized Cost Basis 983,178    
Revolving Loans Amortized Cost Basis Converted to Term 4,743    
Total 1,489,688 1,580,269  
Commercial | Commercial and industrial | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 6,473    
2018 1,341    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 12,776    
Revolving Loans Amortized Cost Basis Converted to Term 2,284    
Total 22,874 45,323  
Commercial | Commercial and industrial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 2,546    
2019 17,425    
2018 0    
2017 194    
2016 21,555    
Prior 2,605    
Revolving Loans Amortized Cost Basis 13,087    
Revolving Loans Amortized Cost Basis Converted to Term 8,249    
Total 65,661 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 15,189    
2019 154,592    
2018 229,702    
2017 73,134    
2016 102,913    
Prior 224,895    
Revolving Loans Amortized Cost Basis 8,011    
Revolving Loans Amortized Cost Basis Converted to Term 1,588    
Total 810,024 818,817 865,521
Commercial | Commercial real estate | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 15,189    
2019 152,789    
2018 229,702    
2017 73,134    
2016 102,913    
Prior 218,978    
Revolving Loans Amortized Cost Basis 8,011    
Revolving Loans Amortized Cost Basis Converted to Term 1,588    
Total 802,304 813,846  
Commercial | Commercial real estate | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 1,803    
2018 0    
2017 0    
2016 0    
Prior 742    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 2,545 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 5,175    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 5,175 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 49,455    
2019 440,695    
2018 347,864    
2017 276,075    
2016 151,406    
Prior 200,588    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 1,466,083 1,494,528 2,332,527
Commercial | Multifamily | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 49,455    
2019 440,695    
2018 338,904    
2017 276,075    
2016 151,406    
Prior 197,596    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 1,454,131 1,484,931  
Commercial | Multifamily | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 8,960    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 8,960 4,256  
Commercial | Multifamily | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior 2,992    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 2,992 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 1,787    
2019 16,067    
2018 1,778    
2017 6,589    
2016 17,321    
Prior 22,932    
Revolving Loans Amortized Cost Basis 2,003    
Revolving Loans Amortized Cost Basis Converted to Term 2,106    
Total 70,583 70,981 74,998
Commercial | SBA | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 1,787    
2019 16,067    
2018 1,388    
2017 5,300    
2016 15,105    
Prior 19,797    
Revolving Loans Amortized Cost Basis 1,667    
Revolving Loans Amortized Cost Basis Converted to Term 515    
Total 61,626 60,982  
Commercial | SBA | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 229    
2016 479    
Prior 987    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 7    
Total 1,702 2,760  
Commercial | SBA | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 1,060    
2016 1,529    
Prior 1,515    
Revolving Loans Amortized Cost Basis 336    
Revolving Loans Amortized Cost Basis Converted to Term 1,197    
Total 5,637 5,621  
Commercial | SBA | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 390    
2017 0    
2016 208    
Prior 633    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 387    
Total 1,618 1,618  
Commercial | Construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 12,948    
2019 39,120    
2018 84,631    
2017 87,270    
2016 3,978    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 227,947 231,350 $ 211,549
Commercial | Construction | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 12,948    
2019 39,120    
2018 76,619    
2017 87,270    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 215,957 229,771  
Commercial | Construction | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 8,012    
2017 0    
2016 3,978    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 11,990 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  
Commercial | Traditional Loans | Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1,578,223 1,691,270  
Commercial | Traditional Loans | Commercial real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 810,024 818,817  
Commercial | Traditional Loans | Multifamily      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 1,466,083 1,494,528  
Commercial | Traditional Loans | SBA      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 70,583 70,981  
Commercial | Traditional Loans | Construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 227,947 231,350  
Consumer | Single family residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 5,431    
2019 178,982    
2018 373,329    
2017 225,375    
2016 336,873    
Prior 326,228    
Revolving Loans Amortized Cost Basis 21,157    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 1,467,375 1,590,774  
Consumer | Single family residential mortgage | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 5,431    
2019 177,908    
2018 371,674    
2017 221,287    
2016 328,033    
Prior 304,408    
Revolving Loans Amortized Cost Basis 21,157    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 1,429,898 1,559,253  
Consumer | Single family residential mortgage | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 1,157    
2017 668    
2016 5,070    
Prior 4,057    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 10,952 10,735  
Consumer | Single family residential mortgage | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 1,074    
2018 498    
2017 3,420    
2016 3,253    
Prior 17,763    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 26,008 20,269  
Consumer | Single family residential mortgage | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 517    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 0    
Total 517 517  
Consumer | Other consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 55    
2019 95    
2018 121    
2017 0    
2016 14    
Prior 5,366    
Revolving Loans Amortized Cost Basis 38,314    
Revolving Loans Amortized Cost Basis Converted to Term 3,264    
Total 47,229 54,165  
Consumer | Other consumer | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 55    
2019 95    
2018 86    
2017 0    
2016 14    
Prior 5,332    
Revolving Loans Amortized Cost Basis 37,992    
Revolving Loans Amortized Cost Basis Converted to Term 2,941    
Total 46,515 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 0    
Revolving Loans Amortized Cost Basis 0    
Revolving Loans Amortized Cost Basis Converted to Term 224    
Total 224 346  
Consumer | Other consumer | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 0    
2019 0    
2018 35    
2017 0    
2016 0    
Prior 34    
Revolving Loans Amortized Cost Basis 322    
Revolving Loans Amortized Cost Basis Converted to Term 99    
Total 490 488  
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  
Consumer | Traditional Loans | Single family residential mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 909,211 992,417  
Consumer | Traditional Loans | Other consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total $ 45,335 $ 51,866