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SEGMENT REPORTING (Segment Financial Information by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]                  
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.  
Interest Expense, Operating $ 55,859       $ 60,166     $ 164,504 $ 168,487
Interest Income (Expense), Net 149,989       135,675     435,471 401,180
PROVISION FOR CREDIT LOSSES 2,670       1,692     10,604 4,581
Operating Income (Loss) 20,730       18,063     57,589 46,853
Noninterest Expense 102,022       96,291     304,629 292,060
Net Income (Loss) Attributable to Parent 53,502 $ 45,496 $ 45,135 $ 46,391 45,153 $ 39,795 $ 37,559 144,133 122,507
Financing Receivable, after Allowance for Credit Loss 11,542,831     11,199,135       11,542,831  
Assets 16,563,081     16,200,037       16,563,081  
Deposits 14,015,935     13,514,398       14,015,935  
Corporate Segment and Other Operating Segment                  
Segment Reporting Information [Line Items]                  
Interest Income, Operating 205,848 200,259     195,841     599,975 569,667
Interest Expense, Operating 55,859 55,860     60,166     164,504 168,487
Interest Income (Expense), Net 149,989 144,399     135,675     435,471 401,180
PROVISION FOR CREDIT LOSSES 2,670 4,795     1,692     10,604 4,581
Operating Income (Loss)   17,751     18,063     57,589 46,853
Noninterest Expense 102,022 101,348     96,291     304,629 292,060
Net Income (Loss) Attributable to Parent 53,502 45,496     45,153     144,133 122,507
Cash and securities 3,662,991 3,529,241   3,607,933 3,730,637     3,662,991 3,730,637
Financing Receivable, after Allowance for Credit Loss 11,542,831 11,529,872   11,199,135 11,070,021     11,542,831 11,070,021
Assets 16,563,081 16,437,169   16,200,037 16,188,676     16,563,081 16,188,676
Core deposits 12,475,553 12,049,519   12,014,726 12,016,295     12,475,553 12,016,295
Deposits $ 14,015,935 $ 13,527,291   $ 13,514,398 $ 13,538,148     $ 14,015,935 $ 13,538,148
Key Financial Ratio, Return on Average Assets, Percent 1.30% 1.13%     1.13%     1.19% 1.04%
Key Financial Ratio, Net Interest Margin, Percent 3.98% 3.92%     3.72%     3.94% 3.72%
Key Financial Ratio, Non-Interest Expense to Average Assets, Percent 2.48% 2.52%     2.42%     2.53% 2.48%
Key Financial Ratio, Efficiency Ratio, Percent 59.76% 62.50%     62.63%     61.78% 65.19%