Consolidated Balance Sheets Parenthetical disclosures - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		$ 7,015,269	$ 6,856,277
Equity Securities, Cost		$ 95,269	$ 93,564
Preferred stock, shares authorized		10,000,000	10,000,000
Preferred stock, shares issued		5,000,000	5,000,000
Preferred stock, shares outstanding		5,000,000	5,000,000
Common stock, shares outstanding		24,664,215	24,718,815
Common Class A
Common stock, shares authorized		88,500,000	88,500,000
Common Stock, Shares, Issued		24,652,802	24,707,402
Common stock, shares outstanding		24,652,802	24,707,402
Common Class B
Common stock, shares authorized		1,500,000	1,500,000
Common Stock, Shares, Issued		11,413	11,413
Common stock, shares outstanding	[1]	11,413	11,413
Parent Company
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		$ 18,420	$ 21,420
Equity Securities, Cost		$ 6,587	$ 5,304

[1] There is no established market for our Class B common stock, although it is convertible upon demand of the holder into Class A common stock on a share-for-share basis.