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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Interest bearing deposits, banks $ 242,229,000 $ 1,094,312,000
Held-to-maturity securities, fair values $ 1,084,390,000 $ 1,028,452,000
Preferred stock, no par value
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 150,000 150,000
Preferred stock, shares outstanding 150,000 150,000
6.75% non-cumulative perpetual preferred stock, Series A, liquidation preference $ 150,000,000 $ 150,000,000
Common stock, par value $ 2.0833 $ 2.0833
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 68,081,306 68,081,306
Common stock, shares outstanding 59,198,963 62,307,245
Treasury stock, shares 8,882,343 5,774,061