CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
AVAILABLE FOR SALE:
Securities available for sale, amortized cost	$ 2,655,594	$ 2,437,513
Held to maturity
Securities held to maturity, fair value	$ 95,235	$ 118,198
Stockholders' equity
Common Stock, Par or Stated Value Per Share	$ 1.25	$ 1.25
Common Stock, Shares Authorized	80,000,000	80,000,000
Common Stock, Shares, Issued	37,968,969	37,934,819
Treasury Stock, Shares	5,616,917	4,983,645