Income Tax - (Narrative) (Details) - USD ($)		1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 22, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal statutory income tax rate	21.00%	34.00%	34.00%	21.00%	34.00%	34.00%
AMT credit carryover				$ 505,000,000
State net operating loss				$ 35,000,000
State net operating loss expiration year				Dec. 31, 2024
Recognized deferred income tax liability				$ 14,700,000
Unrecorded deferred income tax liability				3,100,000
Effect of "Tax Cuts and Jobs Act"					$ 2,000,000
Current receivable				505,000,000
Low Income Housing tax credit				316,000
Universal Bancorp [Member]
Operating loss carryforwards				$ 7,200,000
Operating loss carryforwards, limitations on use				The use of this carryforward is limited to $1.3 million annually.
Operating loss carryforwards limitations on use annual amount				$ 1,300,000