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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality By Past Due Status (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Aged analysis of the company's loans |  |
Total past due | $ 8,144,696 | $ 7,373,639
Interest income on nonaccrual loans | 0 |
Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 61,098 | 73,495
Nonaccrual | 31,686 | 41,665
Total Loans | 8,144,696 | 7,373,639
Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 23,973 | 28,022
Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 5,439 | 3,808
Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 8,083,598 | 7,300,144
Business Lending |  |
Aged analysis of the company's loans |  |
Total past due | 3,331,998 | 3,075,904
Consumer Mortgage |  |
Aged analysis of the company's loans |  |
Total past due | 2,903,822 | 2,556,114
Consumer Indirect |  |
Aged analysis of the company's loans |  |
Total past due | 1,309,753 | 1,189,749
Consumer Direct |  |
Aged analysis of the company's loans |  |
Total past due | 173,686 | 153,811
Home Equity |  |
Aged analysis of the company's loans |  |
Total past due | 425,437 | 398,061
Commercial Portfolio Segment | Business Lending |  |
Aged analysis of the company's loans |  |
Total past due | 3,331,998 | 3,075,904
Commercial Portfolio Segment | Business Lending | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 13,338 | 29,744
Nonaccrual | 10,160 | 24,105
Total Loans | 3,331,998 | 3,075,904
Commercial Portfolio Segment | Business Lending | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 2,567 | 5,540
Commercial Portfolio Segment | Business Lending | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 611 | 99
Commercial Portfolio Segment | Business Lending | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 3,318,660 | 3,046,160
Residential Portfolio Segment | Consumer Mortgage | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 32,441 | 28,652
Nonaccrual | 18,557 | 15,027
Total Loans | 2,903,822 | 2,556,114
Residential Portfolio Segment | Consumer Mortgage | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 9,391 | 10,297
Residential Portfolio Segment | Consumer Mortgage | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 4,493 | 3,328
Residential Portfolio Segment | Consumer Mortgage | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 2,871,381 | 2,527,462
Consumer Portfolio Segment | Consumer Mortgage |  |
Aged analysis of the company's loans |  |
Total past due | 2,903,822 | 2,556,114
Consumer Portfolio Segment | Consumer Indirect |  |
Aged analysis of the company's loans |  |
Total past due | 1,309,753 | 1,189,749
Consumer Portfolio Segment | Consumer Indirect | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 9,665 | 9,698
Nonaccrual | 7 | 0
Total Loans | 1,309,753 | 1,189,749
Consumer Portfolio Segment | Consumer Indirect | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 9,534 | 9,611
Consumer Portfolio Segment | Consumer Indirect | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 124 | 87
Consumer Portfolio Segment | Consumer Indirect | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 1,300,088 | 1,180,051
Consumer Portfolio Segment | Consumer Direct |  |
Aged analysis of the company's loans |  |
Total past due | 173,686 | 153,811
Consumer Portfolio Segment | Consumer Direct | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 1,061 | 819
Nonaccrual | 32 | 1
Total Loans | 173,686 | 153,811
Consumer Portfolio Segment | Consumer Direct | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 1,029 | 796
Consumer Portfolio Segment | Consumer Direct | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 0 | 22
Consumer Portfolio Segment | Consumer Direct | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 172,625 | 152,992
Consumer Portfolio Segment | Home Equity |  |
Aged analysis of the company's loans |  |
Total past due | 425,437 | 398,061
Consumer Portfolio Segment | Home Equity | Legacy Loan [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 4,593 | 4,582
Nonaccrual | 2,930 | 2,532
Total Loans | 425,437 | 398,061
Consumer Portfolio Segment | Home Equity | Legacy Loan [Member] | Past Due 30 - 89 Days [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 1,452 | 1,778
Consumer Portfolio Segment | Home Equity | Legacy Loan [Member] | Financial Asset, Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | 211 | 272
Consumer Portfolio Segment | Home Equity | Legacy Loan [Member] | Financial Asset, Not Past Due [Member] |  |
Aged analysis of the company's loans |  |
Total past due | $ 420,844 | $ 393,479

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