CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Bonds available-for-sale, pledged as collateral		$ 85,347
Investments in partnerships	$ 202,146	8,779
Loans to a related party	$ 86,968	$ 67,000
Preferred shares, shares authorized	5,000,000
Preferred shares, shares issued	0
Preferred stock, shares outstanding	0
Common stock, par value	$ 0	$ 0
Common stock, authorized	50,000,000	50,000,000
Common shares, shares issued (in shares)	5,778,883	5,777,216
Common shares, shares outstanding (in shares)	5,778,883	5,777,216
Common shares, non-employee directors' and employee deferred shares (in shares)	110,092	104,464