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CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Assets: |  |
Available-for-sale investment securities, Pledged Amount | $ 433,578 | $ 485,414
Available-for-sale investment securities, cost | 6,255,259 | 4,980,102
Equity and other securities, cost | $ 51,653 | $ 43,917
Shareholders' equity: |  |
Preferred stock, par value (in dollars per share) | $ 1.00 | $ 1.00
Preferred stock, shares authorized (in shares) | 500,000 | 500,000
Preferred stock, shares issued (in shares) | 0 | 0
Common stock, par value (in dollars per share) | $ 1.00 | $ 1.00
Common stock, shares authorized (in shares) | 75,000,000 | 75,000,000
Common stock, shares issued (in shares) | 54,185,117 | 54,092,421
Treasury stock, shares at cost (in shares) | 451,090 | 214,374
Shares held by deferred compensation arrangements (in shares) | 133,575 | 146,860

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