Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 141,666	$ 85,145	$ 74,471	$ 60,519
Investment in subsidiaries	1,702	1,702
Other assets	8,412	10,985
Total assets	909,023	790,468
LIABILITIES AND STOCKHOLDERS' EQUITY
Revolving credit facility payable	1,473	1,473
Subordinated debt securities	56,702	56,702
Accrued Income Taxes	719	1,518
Accounts payable and other accrued expenses	19,006	23,305
Total liabilities	670,905	569,931
Stockholders' equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2013 and in 2012	3,757	3,757
Capital in excess of par value	122,827	122,475
Retained earnings	106,209	97,964
Accumulated other comprehensive income	16,883	7,899
Treasury stock (1,609,374 shares in 2013 and 2012), at cost	(11,558)	(11,558)
Total stockholders equity	238,118	220,537	215,572	235,278
Total liabilities and stockholders' equity	909,023	790,468
Parent Company [Member]
ASSETS
Cash and cash equivalents	8,063	1,112	3,309	10,983
Investment in subsidiaries	316,295	296,258
Deferred federal income taxes	930	2,112
Other assets	3,729	3,416
Total assets	329,017	302,898
LIABILITIES AND STOCKHOLDERS' EQUITY
Revolving credit facility payable	1,473	1,473
Subordinated debt securities	56,702	56,702
Accrued Income Taxes	3,353	7,047
Accounts payable and other accrued expenses	29,371	17,139
Total liabilities	90,899	82,361
Stockholders' equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2013 and in 2012	3,757	3,757
Capital in excess of par value	122,827	122,475
Retained earnings	106,209	97,964
Accumulated other comprehensive income	16,883	7,899
Treasury stock (1,609,374 shares in 2013 and 2012), at cost	(11,558)	(11,558)
Total stockholders equity	238,118	220,537
Total liabilities and stockholders' equity	$ 329,017	$ 302,898