CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Available for sale debt securities, amortized cost	$ 1,051,800	$ 881,570
Allowance for credit losses on securities	$ 0	$ 0
Common stock, par value (in dollars per share)	$ 0.0625	$ 0.0625
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	17,363,457	17,363,457
Common stock, shares outstanding (in shares)	17,330,818	17,265,337
Treasury stock (in shares)	32,639	98,120