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CREDIT QUALITY ASSESSMENT (information about credit quality indicator by year of origination) (Detail)
$ in Thousands
Mar. 31, 2020
USD ($)
Commercial [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 $ 43,887
2019 108,016
2018 136,980
2017 71,857
2016 40,978
Prior 84,254
Revolving Loans 327,553
Total 813,525
Commercial [Member] | Pass  
Financing Receivable Recorded Investment [Line Items]  
2020 43,565
2019 106,211
2018 133,570
2017 70,396
2016 38,508
Prior 80,786
Revolving Loans 325,583
Total 798,619
Commercial [Member] | Special Mention  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 701
2018 26
2017 379
2016 304
Prior 633
Revolving Loans 499
Total 2,542
Commercial [Member] | Substandard [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 322
2019 1,104
2018 3,384
2017 1,082
2016 2,166
Prior 2,835
Revolving Loans 1,471
Total 12,364
Commercial [Member] | Doubtful  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans 0
Total 0
Commercial AD&C [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 119,146
2019 237,288
2018 189,776
2017 54,754
2016 2,901
Prior 2,404
Revolving Loans 36,845
Total 643,114
Commercial AD&C [Member] | Pass  
Financing Receivable Recorded Investment [Line Items]  
2020 119,146
2019 237,288
2018 189,046
2017 54,654
2016 2,901
Prior 2,404
Revolving Loans 36,845
Total 642,284
Commercial AD&C [Member] | Special Mention  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans 0
Total 0
Commercial AD&C [Member] | Substandard [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 730
2017 100
2016 0
Prior 0
Revolving Loans 0
Total 830
Commercial AD&C [Member] | Doubtful  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans 0
Total 0
Commercial Investor RE [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 169,795
2019 583,790
2018 320,043
2017 304,855
2016 361,330
Prior 486,588
Revolving Loans 14,839
Total 2,241,240
Commercial Investor RE [Member] | Pass  
Financing Receivable Recorded Investment [Line Items]  
2020 169,448
2019 580,249
2018 319,063
2017 304,598
2016 361,218
Prior 470,582
Revolving Loans 14,839
Total 2,219,997
Commercial Investor RE [Member] | Special Mention  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 883
2018 980
2017 257
2016 0
Prior 342
Revolving Loans 0
Total 2,462
Commercial Investor RE [Member] | Substandard [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 347
2019 2,658
2018 0
2017 0
2016 112
Prior 15,664
Revolving Loans 0
Total 18,781
Commercial Investor RE [Member] | Doubtful  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans 0
Total 0
Commercial Owner Occupied RE [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 88,082
2019 256,603
2018 180,542
2017 227,665
2016 212,750
Prior 338,727
Revolving Loans 1,313
Total 1,305,682
Commercial Owner Occupied RE [Member] | Pass  
Financing Receivable Recorded Investment [Line Items]  
2020 88,082
2019 254,565
2018 179,210
2017 226,489
2016 212,350
Prior 333,170
Revolving Loans 1,313
Total 1,295,179
Commercial Owner Occupied RE [Member] | Special Mention  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 1,050
2018 878
2017 0
2016 0
Prior 333
Revolving Loans 0
Total 2,261
Commercial Owner Occupied RE [Member] | Substandard [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 988
2018 454
2017 1,176
2016 400
Prior 5,224
Revolving Loans 0
Total 8,242
Commercial Owner Occupied RE [Member] | Doubtful  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans 0
Total 0
Consumer [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 792
2019 9,005
2018 8,079
2017 4,296
2016 5,770
Prior 33,926
Revolving Loans 391,478
Total 453,346
Consumer [Member] | 660-850 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 627
2019 7,093
2018 7,477
2017 3,462
2016 3,342
Prior 21,332
Revolving Loans 361,325
Total 404,658
Consumer [Member] | 600-659 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 108
2019 771
2018 167
2017 185
2016 1,039
Prior 5,748
Revolving Loans 14,705
Total 22,723
Consumer [Member] | 540-599 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 1
2019 69
2018 153
2017 236
2016 795
Prior 3,126
Revolving Loans 5,993
Total 10,373
Consumer [Member] | Less than 540 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 56
2019 1,072
2018 282
2017 413
2016 594
Prior 3,720
Revolving Loans 9,455
Total 15,592
Residential Mortgage [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 20,170
2019 64,927
2018 218,466
2017 254,344
2016 188,596
Prior 370,009
Revolving Loans 0
Total 1,116,512
Residential Mortgage [Member] | 660-850 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 19,705
2019 50,503
2018 191,761
2017 236,191
2016 171,471
Prior 317,518
Revolving Loans 0
Total 987,149
Residential Mortgage [Member] | 600-659 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 202
2019 11,096
2018 14,850
2017 13,690
2016 10,053
Prior 22,938
Revolving Loans 0
Total 72,829
Residential Mortgage [Member] | 540-599 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 171
2019 1,883
2018 5,062
2017 1,645
2016 4,628
Prior 13,289
Revolving Loans 0
Total 26,678
Residential Mortgage [Member] | Less than 540 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 92
2019 1,445
2018 6,793
2017 2,818
2016 2,444
Prior 16,264
Revolving Loans 0
Total 29,856
Residential Construction [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 24,305
2019 75,844
2018 41,796
2017 5,660
2016 1,968
Prior 0
Revolving Loans 0
Total 149,573
Residential Construction [Member] | 660-850 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 23,564
2019 72,488
2018 41,516
2017 5,660
2016 1,968
Prior 0
Revolving Loans 0
Total 145,196
Residential Construction [Member] | 600-659 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 741
2019 3,356
2018 280
2017 0
2016 0
Prior 0
Revolving Loans 0
Total 4,377
Residential Construction [Member] | 540-599 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans 0
Total 0
Residential Construction [Member] | Less than 540 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans 0
Total $ 0