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CONSOLIDATED BALANCE SHEETS CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Available-for-sale Securities, Amortized Cost Basis $ 3,698,779 $ 3,330,029
Debt Securities, Held-to-maturity, Fair Value $ 124,294 $ 136,698
Common Stock, No Par Value $ 0 $ 0
Common Stock, Shares Authorized 160,000,000 160,000,000
Common Stock, Shares, Issued 104,281,794 104,281,794
Treasury Stock, Shares 6,764,101 6,259,865