Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt securities, available-for-sale, Amortized cost (in dollars)	$ 344,232	$ 502,167
Equity securities, available for sale, cost (in dollars)	$ 46,847	$ 26,988
Common stock, par value (in dollars per share)	$ 0.18	$ 0.18
Common stock, authorized shares	33,333,333	33,333,333
Common stock, issued shares	20,872,831	20,872,831
Treasury stock, shares	2,701,799	2,730,673
Senior unsecured notes due 2029 [Member]
Unamortized debt issuance cost (in dollars)	$ 820	$ 844
Subordinated Debt [Member]
Unamortized debt issuance cost (in dollars)	$ 782	$ 795