INVESTMENTS Debt and Short-term Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Other invested assets
Other investments	$ 63,440		$ 63,440		$ 70,441
Investment in Federal Home Loan Bank Stock	us-gaap:AssetPledgedAsCollateralMember		us-gaap:AssetPledgedAsCollateralMember
Cash and Short-term Investments
Cash	$ 84,797		$ 84,797		46,203
Investment In Low Income Housing Tax Credit Partnership Net Of Amortization
Other invested assets
Other investments	21,600		21,600		23,300
Total tax benefit on investments in housing tax credit partnership	900	$ 600	1,800	$ 1,200
Qualified Affordable Housing Project Investments, Commitment	7,400		7,400
Investment in Federal Home Loan Bank Stock
Other invested assets
Investments pledged as collateral	14,600		14,600
Federal Home Loan Bank Borrowings, Fair Value Disclosure	0		0
Investment in Private Funds
Other invested assets
Other investments	24,400		24,400		$ 46,000
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	10,400		10,400
Investment in Restricted Stock
Other invested assets
Other investments	$ 15,800		$ 15,800