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INVESTMENT SECURITIES (Narrative) (Details)
 1 Months Ended 12 Months Ended
May 31, 2022
USD ($)
investment
Mar. 31, 2022
USD ($)
investment
Dec. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
Jun. 30, 2022
USD ($)
shares
EQUITY            
Investment securities classified from available-for-sale to held-to-maturity | investment 40 41        
Investment securities, amortized cost basis $ 400,900,000 $ 361,800,000        
Fair Value 343,700,000 329,500,000 $ 596,780,000 $ 0    
Net unrealized loss from transfer of securities $ 57,200,000 $ 32,300,000        
Proceeds from sales of available-for-sale and equity investment securities       279,500,000 $ 180,100,000  
Net gains (losses) on sales of investment securities     $ 8,506,000 150,000 (201,000)  
Gross realized gains       3,400,000 700,000  
Gross realized losses       3,200,000 $ 900,000  
Proceeds from sale of equity method i investment securities       $ 1,700,000    
Number of investment securities in an unrealized loss position | security     243 153    
Common stock, no par value, authorized 185,000,000 shares; issued and outstanding 27,025,070 and 27,714,071 shares at December 31, 2022 and 2021, respectively     $ 408,071,000 $ 426,091,000    
Common Class B | Visa            
EQUITY            
Shares owned (in shares) | shares           34,631
Common stock, no par value, authorized 185,000,000 shares; issued and outstanding 27,025,070 and 27,714,071 shares at December 31, 2022 and 2021, respectively           $ 8,500,000
Collateralized Mortgage-Backed Securities | Asset Pledged as Collateral without Right            
EQUITY            
Available-for-sale debt securities, at fair value     $ 607,700,000 $ 455,800,000