Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Common Stock		Additional Paid-in Capital	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive Income (Loss)	Unearned Compensation - ESOP	Total
Balance at beginning of period at Dec. 31, 2018		$ 327		$ 152,156	$ 219,088	$ (1,548)	$ (2,358)	$ (10,091)	$ 357,574
Balance, beginning of period (in shares) at Dec. 31, 2018	[1]	58,465,505
Comprehensive income					2,067		2,488		4,555
ESOP shares committed to be released (in shares)				90				149	239
Restricted stock awards forfeited, net of awards issued (in shares)	[1]	(6,012)
Share-based compensation expense				1,080					1,080
Balance at end of year at Mar. 31, 2019		$ 327		153,326	221,155	(1,548)	130	(9,942)	363,448
Balance, end of period (in shares) at Mar. 31, 2019	[1]	58,459,493
Balance at beginning of period at Dec. 31, 2019		$ 584		460,232	237,356	(721)	1,480	(33,137)	$ 665,794
Balance, beginning of period (in shares) at Dec. 31, 2019		58,418,021	[1]						58,418,021
Comprehensive income					4,724		2,778		$ 7,502
ESOP shares committed to be released (in shares)				121				459	580
Share-based compensation expense				1,263					1,263
Balance at end of year at Mar. 31, 2020		$ 584		$ 461,616	$ 242,080	$ (721)	$ 4,258	$ (32,678)	$ 675,139
Balance, end of period (in shares) at Mar. 31, 2020		58,418,021	[1]						58,418,021

[1] Share amounts related to periods prior to the August 14, 2019 closing of the conversion offering have been restated to give retroactive recognition to the 1.795431 exchange ratio applied in the conversion offering (see Note 1).