Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Balance Sheet Extra) (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt securities, available-for-sale, Amortized cost (in dollars)	$ 502,167	$ 569,498
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	2,730,673	2,749,738
Senior unsecured notes due 2029 [Member]
Unamortized debt issuance cost (in dollars)	$ 844	$ 942
Subordinated Debt [Member]
Unamortized debt issuance cost (in dollars)	795	846
Parent Company [Member]
Debt securities, available-for-sale, Amortized cost (in dollars)	$ 0	$ 150
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	2,730,673	2,749,738
Parent Company [Member] | Senior unsecured notes due 2029 [Member]
Unamortized debt issuance cost (in dollars)	$ 844	$ 942
Parent Company [Member] | Subordinated Debt [Member]
Unamortized debt issuance cost (in dollars)	$ 795	$ 846