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SEGMENT REPORTING (Segment Financial Information by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Segment Reporting Information [Line Items]          
Interest Expense, Operating $ 52,785       $ 51,729
Interest Income (Expense), Net 141,083       132,959
PROVISION FOR CREDIT LOSSES 3,139       520
Operating Income (Loss) 19,108       11,591
Noninterest Expense 101,259       97,641
Net Income (Loss) Attributable to Parent 45,135 $ 46,391 $ 45,153 $ 39,795 37,559
Financing Receivable, after Allowance for Credit Loss 11,281,473 11,199,135      
Assets 16,170,812 16,200,037      
Deposits $ 13,593,265 13,514,398      
Segment Reporting, Factors Used to Identify Entity's Reportable Segments The Company is managed by legal entity, rather than by lines of business, and its activities are considered a single operating segment for financial reporting purposes.        
Segment Reporting Information, Description of Products and Services The Bank is engaged in the single line of business of community banking, which involves gathering deposits and originating loans in its primary market areas. The Bank manages its operations, allocates resources, and monitors and reports its financials as a single operating segment.        
Corporate Segment and Other Operating Segment          
Segment Reporting Information [Line Items]          
Interest Income, Operating $ 193,868 196,436     184,688
Interest Expense, Operating 52,785 55,900     51,729
Interest Income (Expense), Net 141,083 140,536     132,959
PROVISION FOR CREDIT LOSSES 3,139 3,000     520
Operating Income (Loss) 19,108 20,035     11,591
Noninterest Expense 101,259 99,478     97,641
Net Income (Loss) Attributable to Parent 45,135 46,391     37,559
Cash and securities 3,542,686 3,607,933     3,492,527
Financing Receivable, after Allowance for Credit Loss 11,281,473 11,199,135     10,717,956
Assets 16,170,812 16,200,037     15,518,279
Core deposits 12,089,215 12,014,726     11,672,891
Deposits $ 13,593,265 $ 13,514,398     $ 13,158,771
Key Financial Ratio, Return on Average Assets, Percent 1.15% 1.15%     0.97%
Key Financial Ratio, Net Interest Margin, Percent 3.92% 3.82%     3.74%
Key Financial Ratio, Non-Interest Expense to Average Assets, Percent 2.57% 2.48%     2.52%
Key Financial Ratio, Efficiency Ratio, Percent 63.21% 61.95%     67.55%