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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Reconciliation of Capital Amounts (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Reconciliation of capital amounts [Abstract]                          
Total stockholders' equity $ 822,189 $ 747,896 $ 719,076 $ 704,246 $ 618,347 $ 656,071 $ 660,610 $ 647,151 $ 633,211 $ 714,980 $ 753,740 $ 819,868 $ 871,884
Adjustments:                          
LESS: Goodwill, net of associated deferred tax liabilities 296,105       297,679                
LESS: Certain other intangible assets 18,018       21,228                
LESS: Net deferred tax assets from operating loss and tax credit carry-forwards 15,624       23,323                
LESS: Net unrealized (losses) on available for sale securities (152,328)       (254,294)                
LESS: Noncontrolling interest (277) $ (506) $ (420) $ (510) (1,005) $ (631) $ (551) $ (207) $ (30) $ 665 $ 322 $ 642  
ADD: Adoption of Accounting Standards Update 2016-13 3,576       5,363                
Common Equity Tier 1 648,623       536,779                
Long-term borrowings and other instruments qualifying as Tier 1 13,661       13,661                
Tier 1 minority interest not included in common equity Tier 1 capital (150)       (826)                
Total Tier 1 capital 662,134       549,614                
Allowance for credit losses 66,140       63,408                
Subordinated debentures, net of issuance costs 19,693       19,591                
Total capital $ 747,967       $ 632,613                
Common Equity Tier 1, risk-based (as a percent) 0.070                        
Tier 1 risk-based (as a percent) 0.085                        
Total risk based capital ratios with buffer (as a percent) 0.105                        
Capital conservation buffer requirement 0.025