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LOANS - Total Loans Outstanding (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable before allowance for credit loss | $ 4,874,496 | $ 4,713,465 |  |  |  |
Percentage of loans receivable | 100.00% | 100.00% |  |  |  |
Less: Allowance for credit losses | $ (72,105) | $ (72,606) | $ (72,058) | $ (67,239) | $ (67,523) | $ (67,773)
Net deferred loan fees | (3,531) | (3,069) |  |  |  |
Loans, net | 4,798,860 | 4,637,790 |  |  |  |
Total commercial loans | Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable before allowance for credit loss | $ 4,331,146 | $ 4,217,824 |  |  |  |
Percentage of loans receivable | 88.80% | 89.50% |  |  |  |
Total consumer loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable before allowance for credit loss | $ 543,350 | $ 495,641 |  |  |  |
Percentage of loans receivable | 11.20% | 10.50% |  |  |  |
Other consumer loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable before allowance for credit loss | $ 93,737 | $ 88,075 |  |  |  |
Percentage of loans receivable | 1.90% | 1.90% |  |  |  |
Commercial and industrial loans: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable before allowance for credit loss | $ 1,402,220 | $ 1,493,049 |  |  |  |
Percentage of loans receivable | 28.80% | 31.70% |  |  |  |
Commercial and industrial loans: | Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | $ (30,639) | $ (35,290) | (30,978) | (32,348) | (31,195) | (30,595)
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 | $ 589,345 | $ 650,948 |  |  |  |
Percentage of loans receivable | 12.10% | 13.80% |  |  |  |
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 | $ 812,875 | $ 842,101 |  |  |  |
Percentage of loans receivable | 16.70% | 17.90% |  |  |  |
Commercial real estate and multi-family residential loans: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable before allowance for credit loss | $ 2,422,459 | $ 2,179,094 |  |  |  |
Percentage of loans receivable | 49.60% | 46.20% |  |  |  |
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 | $ 633,920 | $ 517,664 |  |  |  |
Percentage of loans receivable | 13.00% | 11.00% |  |  |  |
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 | $ 811,175 | $ 758,091 |  |  |  |
Percentage of loans receivable | 16.60% | 16.00% |  |  |  |
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 | $ 740,783 | $ 706,107 |  |  |  |
Percentage of loans receivable | 15.20% | 15.00% |  |  |  |
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 | $ 236,581 | $ 197,232 |  |  |  |
Percentage of loans receivable | 4.80% | 4.20% |  |  |  |
Agri-business and agricultural loans: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable before allowance for credit loss | $ 380,528 | $ 432,088 |  |  |  |
Percentage of loans receivable | 7.80% | 9.20% |  |  |  |
Agri-business and agricultural loans: | Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for credit losses | $ (4,263) | $ (4,429) | $ (4,402) | $ (4,206) | $ (4,753) | $ (5,034)
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 | $ 183,241 | $ 201,200 |  |  |  |
Percentage of loans receivable | 3.80% | 4.30% |  |  |  |
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 | $ 197,287 | $ 230,888 |  |  |  |
Percentage of loans receivable | 4.00% | 4.90% |  |  |  |
Other commercial loans: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable before allowance for credit loss | $ 125,939 | $ 113,593 |  |  |  |
Percentage of loans receivable | 2.60% | 2.40% |  |  |  |
Consumer 1-4 family mortgage loans: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable before allowance for credit loss | $ 449,613 | $ 407,566 |  |  |  |
Percentage of loans receivable | 9.30% | 8.60% |  |  |  |
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 | $ 247,114 | $ 212,742 |  |  |  |
Percentage of loans receivable | 5.10% | 4.50% |  |  |  |
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 | $ 189,611 | $ 175,575 |  |  |  |
Percentage of loans receivable | 3.90% | 3.70% |  |  |  |
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 | $ 12,888 | $ 19,249 |  |  |  |
Percentage of loans receivable | 0.30% | 0.40% |  |  |  |

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