Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt securities, available-for-sale, Amortized cost (in dollars)	$ 315,029	$ 502,167
Equity securities, available for sale, cost (in dollars)	$ 39,129	$ 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	2,700,364	2,730,673
Senior unsecured notes due 2029 [Member]
Unamortized debt issuance cost (in dollars)	$ 770	$ 844
Subordinated Debt [Member]
Unamortized debt issuance cost (in dollars)	$ 757	$ 795