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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
ASSETS    
Securities held-to-maturity, fair value $ 1,188,049 $ 1,066,531
Allowance for credit losses - securities held-to-maturity $ (161) $ (191)
Stockholders' equity:    
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 225,000 225,000
Preferred stock, shares outstanding (in shares) 225,000 225,000
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 180,000,000 180,000,000
Common stock, shares issued (in shares) 76,143,000 75,850,000
Common stock, shares outstanding (in shares) 76,143,000 75,850,000