CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Available for sale securities, amortized cost	$ 201,270	$ 234,252
Held-to-maturity securities, fair value	$ 971,092	$ 260,139
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares, outstanding	6,968,192	6,926,728