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LOANS - Total Loans Outstanding (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 4,361,980 |  |  |  |  |  |
Less: Allowance for credit losses |  | $ (71,844) | (71,713) | [1] | $ (61,408) |  |  |  |
Net deferred loan fees |  |  | (8,271) |  |  |  |  |  |
Loans, net | [1] |  | $ 4,281,996 |  |  |  |  |  |
Percentage of loans receivable |  | 100.00% | 100.00% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 4,657,183 |  |  |  |
Less: Allowance for credit losses |  |  |  |  | (61,408) | [1] | $ (59,019) | $ (53,609) | $ (50,652)
Net deferred loan fees |  |  |  |  | (8,027) |  |  |  |
Loans, net | [1] |  |  |  | 4,587,748 |  |  |  |
Total commercial loans | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 3,916,724 |  |  |  |  |  |
Percentage of loans receivable |  | 90.40% | 89.80% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 4,210,049 |  |  |  |
Total consumer loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 445,256 |  |  |  |  |  |
Percentage of loans receivable |  | 9.60% | 10.20% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 447,134 |  |  |  |
Other consumer loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 100,771 |  |  |  |  |  |
Percentage of loans receivable |  | 2.20% | 2.30% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 103,616 |  |  |  |
Commercial and industrial loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 1,502,685 |  |  |  |  |  |
Percentage of loans receivable |  | 38.50% | 34.40% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 1,791,378 |  |  |  |
Less: Allowance for credit losses |  |  |  |  | (28,333) |  | (26,744) | (24,739) | (25,789)
Commercial and industrial loans | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Less: Allowance for credit losses |  | $ (32,052) | $ (33,130) |  | (28,333) |  |  |  |
Commercial and industrial loans | Working capital lines of credit loans | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 616,401 |  |  |  |  |  |
Percentage of loans receivable |  | 13.50% | 14.10% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 626,023 |  |  |  |
Commercial and industrial loans | Non-working capital loans | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 886,284 |  |  |  |  |  |
Percentage of loans receivable |  | 25.00% | 20.30% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 1,165,355 |  |  |  |
Commercial real estate and multi-family residential loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 1,982,031 |  |  |  |  |  |
Percentage of loans receivable |  | 40.70% | 45.50% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 1,895,014 |  |  |  |
Commercial real estate and multi-family residential loans | Construction and land development loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 402,583 |  |  |  |  |  |
Percentage of loans receivable |  | 7.80% | 9.20% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 362,653 |  |  |  |
Commercial real estate and multi-family residential loans | Owner occupied loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 672,903 |  |  |  |  |  |
Percentage of loans receivable |  | 13.90% | 15.50% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 648,019 |  |  |  |
Commercial real estate and multi-family residential loans | Nonowner occupied loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 606,096 |  |  |  |  |  |
Percentage of loans receivable |  | 12.50% | 13.90% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 579,625 |  |  |  |
Commercial real estate and multi-family residential loans | Multifamily loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 300,449 |  |  |  |  |  |
Percentage of loans receivable |  | 6.50% | 6.90% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 304,717 |  |  |  |
Agri-business and agricultural loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 346,652 |  |  |  |  |  |
Percentage of loans receivable |  | 9.20% | 7.90% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 429,644 |  |  |  |
Less: Allowance for credit losses |  |  |  |  | (3,043) |  | $ (3,408) | $ (3,704) | $ (3,869)
Agri-business and agricultural loans | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Less: Allowance for credit losses |  | $ (3,901) | $ (3,930) |  | (3,043) |  |  |  |
Agri-business and agricultural loans | Loans secured by farmland | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 167,314 |  |  |  |  |  |
Percentage of loans receivable |  | 4.20% | 3.80% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 195,410 |  |  |  |
Agri-business and agricultural loans | Loans for agricultural production | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 179,338 |  |  |  |  |  |
Percentage of loans receivable |  | 5.00% | 4.10% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 234,234 |  |  |  |
Other commercial loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 85,356 |  |  |  |  |  |
Percentage of loans receivable |  | 2.00% | 2.00% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 94,013 |  |  |  |
Consumer 1-4 family mortgage loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 344,485 |  |  |  |  |  |
Percentage of loans receivable |  | 7.40% | 7.90% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 343,518 |  |  |  |
Consumer 1-4 family mortgage loans | Closed end first mortgage loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 169,653 |  |  |  |  |  |
Percentage of loans receivable |  | 3.60% | 3.90% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 167,847 |  |  |  |
Consumer 1-4 family mortgage loans | Open end and junior lien loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 162,327 |  |  |  |  |  |
Percentage of loans receivable |  | 3.50% | 3.70% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | 163,664 |  |  |  |
Consumer 1-4 family mortgage loans | Residential construction and land development loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable before allowance for credit loss |  |  | $ 12,505 |  |  |  |  |  |
Percentage of loans receivable |  | 0.30% | 0.30% |  |  |  |  |  |
Loans and leases receivable, gross |  |  |  |  | $ 12,007 |  |  |  |
[1] | Beginning January 1, 2021 calculation is based on the current expected credit loss methodology. Prior to January 1, 2021 calculation was based on the incurred loss methodology.

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