Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ in Thousands
4 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
segment
Jun. 30, 2022
USD ($)
segment
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Accounting Policies [Line Items]          
Number of bank branches | item       114  
Number of ATM's | item       130  
Number of operating segments | segment   2 1    
Accruals for uncertain tax positions   $ 0   $ 0 $ 0
Impairment charges for goodwill $ 0   $ 0 0  
Available for sale securities, allowance for credit losses   0   0  
Goodwill   925,211   925,211 935,560
Loans held for investment, accrued interest receivable   $ 58,900   $ 58,900 43,300
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]   Other Assets   Other Assets  
HTM securities, Accrued interest receivable   $ 8,600   $ 8,600 7,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]   Other Assets   Other Assets  
AFS securities, accrued interest receivable   $ 14,200   $ 14,200 $ 14,500
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]   Other Assets   Other Assets  
Restricted equity securities as a percentage of outstanding borrowings, required by FHLB       4.25% 3.75%
Restricted equity securities as a percentage of outstanding borrowings, required by FRB       6.00% 6.00%
Debt security, duration to be placed in nonaccrual status       90 days  
ALLL, reasonable and supportable forecast period       2 years  
Commercial and consumer loans on nonaccrual status, period       90 days  
Liabilities for post retirement benefits payable to other beneficiaries   $ 13,300   $ 13,300 $ 14,900
Minimum          
Accounting Policies [Line Items]          
Intangible assets, amortization period (years)       4 years  
Period past due to change TDR status       30 days  
Estimated useful life of bank premises       3 years  
Percentage of fair value of the derivative instruments for the hedge to be highly effective       80.00%  
Maximum          
Accounting Policies [Line Items]          
Intangible assets, amortization period (years)       10 years  
Estimated useful life of bank premises       40 years  
Percentage of fair value of the derivative instruments for the hedge to be highly effective       125.00%  
Non-real Estate Secured Loans [Member]          
Accounting Policies [Line Items]          
Consumer loans, period for past due status   120 days   120 days  
Real Estate Secured Loans [Member]          
Accounting Policies [Line Items]          
Consumer loans, period for past due status   180 days   180 days