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CREDIT QUALITY ASSESSMENT (information about credit quality indicator by year of origination) (Detail)
$ in Thousands
Jun. 30, 2020
USD ($)
Financing Receivable Recorded Investment [Line Items]  
2020 $ 2,224,043
2019 1,877,240
2018 1,357,986
2017 1,198,166
2016 997,768
Prior 1,688,181
Revolving Loans 999,659
Total 10,343,043
Commercial [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 1,154,663
2019 214,687
2018 167,198
2017 107,454
2016 54,001
Prior 102,720
Revolving Loans 422,087
Total 2,222,810
Commercial [Member] | Pass  
Financing Receivable Recorded Investment [Line Items]  
2020 1,153,740
2019 209,016
2018 161,601
2017 105,160
2016 48,788
Prior 96,078
Revolving Loans 411,354
Total 2,185,737
Commercial [Member] | Special Mention  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 3,486
2018 1,448
2017 995
2016 1,669
Prior 1,316
Revolving Loans 4,004
Total 12,918
Commercial [Member] | Substandard [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 803
2019 1,078
2018 3,074
2017 1,171
2016 2,157
Prior 3,182
Revolving Loans 3,148
Total 14,613
Commercial [Member] | Doubtful  
Financing Receivable Recorded Investment [Line Items]  
2020 120
2019 1,107
2018 1,075
2017 128
2016 1,387
Prior 2,144
Revolving Loans 3,581
Total 9,542
Commercial AD&C [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 299,178
2019 300,682
2018 205,656
2017 97,519
2016 14,003
Prior 5,813
Revolving Loans 74,572
Total 997,423
Commercial AD&C [Member] | Pass  
Financing Receivable Recorded Investment [Line Items]  
2020 299,178
2019 298,554
2018 203,852
2017 96,783
2016 14,003
Prior 4,711
Revolving Loans 74,572
Total 991,653
Commercial AD&C [Member] | Special Mention  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 1,074
2017 636
2016 0
Prior 0
Revolving Loans 0
Total 1,710
Commercial AD&C [Member] | Substandard [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 2,128
2018 730
2017 100
2016 0
Prior 1,102
Revolving Loans 0
Total 4,060
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 467,790
2019 810,683
2018 499,898
2017 525,311
2016 522,958
Prior 737,181
Revolving Loans 17,957
Total 3,581,778
Commercial Investor RE [Member] | Pass  
Financing Receivable Recorded Investment [Line Items]  
2020 463,624
2019 806,877
2018 485,477
2017 517,520
2016 522,261
Prior 720,158
Revolving Loans 17,957
Total 3,533,874
Commercial Investor RE [Member] | Special Mention  
Financing Receivable Recorded Investment [Line Items]  
2020 3,819
2019 775
2018 14,421
2017 952
2016 0
Prior 1,295
Revolving Loans 0
Total 21,262
Commercial Investor RE [Member] | Substandard [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 347
2019 3,031
2018 0
2017 6,839
2016 697
Prior 15,728
Revolving Loans 0
Total 26,642
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 143,953
2019 376,515
2018 237,276
2017 208,248
2016 212,889
Prior 421,292
Revolving Loans 1,630
Total 1,601,803
Commercial Owner Occupied RE [Member] | Pass  
Financing Receivable Recorded Investment [Line Items]  
2020 142,813
2019 373,413
2018 233,852
2017 203,929
2016 211,171
Prior 408,793
Revolving Loans 1,630
Total 1,575,601
Commercial Owner Occupied RE [Member] | Special Mention  
Financing Receivable Recorded Investment [Line Items]  
2020 1,140
2019 2,124
2018 2,823
2017 3,854
2016 1,321
Prior 5,971
Revolving Loans 0
Total 17,233
Commercial Owner Occupied RE [Member] | Substandard [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 978
2018 601
2017 465
2016 397
Prior 6,239
Revolving Loans 0
Total 8,680
Commercial Owner Occupied RE [Member] | Doubtful  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 0
2018 0
2017 0
2016 0
Prior 289
Revolving Loans 0
Total 289
Consumer [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 2,022
2019 8,337
2018 7,310
2017 4,222
2016 5,960
Prior 47,170
Revolving Loans 483,413
Total 558,434
Consumer [Member] | 660-850 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 1,566
2019 6,449
2018 6,584
2017 2,822
2016 3,394
Prior 32,412
Revolving Loans 438,778
Total 492,005
Consumer [Member] | 600-659 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 320
2019 519
2018 171
2017 167
2016 981
Prior 7,594
Revolving Loans 20,773
Total 30,525
Consumer [Member] | 540-599 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 3
2019 518
2018 232
2017 226
2016 667
Prior 3,734
Revolving Loans 6,472
Total 11,852
Consumer [Member] | Less than 540 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 133
2019 851
2018 323
2017 1,007
2016 918
Prior 3,430
Revolving Loans 17,390
Total 24,052
Residential mortgage loans [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 103,032
2019 81,119
2018 216,354
2017 251,277
2016 185,958
Prior 374,005
Revolving Loans 0
Total 1,211,745
Residential mortgage loans [Member] | 660-850 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 93,464
2019 64,690
2018 191,410
2017 231,236
2016 169,283
Prior 317,589
Revolving Loans 0
Total 1,067,672
Residential mortgage loans [Member] | 600-659 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 1,619
2019 12,324
2018 12,827
2017 13,561
2016 10,103
Prior 25,926
Revolving Loans 0
Total 76,360
Residential mortgage loans [Member] | 540-599 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 835
2019 2,249
2018 6,669
2017 4,376
2016 4,032
Prior 14,405
Revolving Loans 0
Total 32,566
Residential mortgage loans [Member] | Less than 540 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 7,114
2019 1,856
2018 5,448
2017 2,104
2016 2,540
Prior 16,085
Revolving Loans 0
Total 35,147
Residential Construction [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 53,405
2019 85,217
2018 24,294
2017 4,135
2016 1,999
Prior 0
Revolving Loans 0
Total 169,050
Residential Construction [Member] | 660-850 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 49,670
2019 82,559
2018 24,294
2017 4,135
2016 1,630
Prior 0
Revolving Loans 0
Total 162,288
Residential Construction [Member] | 600-659 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 798
2019 536
2018 0
2017 0
2016 0
Prior 0
Revolving Loans 0
Total 1,334
Residential Construction [Member] | 540-599 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 0
2019 2,122
2018 0
2017 0
2016 369
Prior 0
Revolving Loans 0
Total 2,491
Residential Construction [Member] | Less than 540 [Member]  
Financing Receivable Recorded Investment [Line Items]  
2020 2,937
2019 0
2018 0
2017 0
2016 0
Prior 0
Revolving Loans 0
Total $ 2,937