CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Unearned ESOP Shares [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2018	$ 285	$ 232,406	$ 187,153	$ (17,804)	$ (2,361)	$ 399,679
Balances (in shares) at Dec. 31, 2018	28,463,000
Comprehensive income:
Net income	$ 0	0	16,185	0	0	16,185
Other comprehensive income	0	0	0	0	3,016	3,016
Total comprehensive income						19,201
ESOP shares committed to be released to Plan participants	0	281	0	594	0	875
Cash dividend	0	0	(19,518)	0	0	(19,518)
Stock compensation activity, net of tax	$ 0	394	0	0	0	394
Stock compensation activity, net of tax (in shares)	31,000
Stock compensation expense	$ 0	598	0	0	0	598
Purchase of common stock returned to authorized but unissued	$ (9)	(14,417)	0	0	0	(14,426)
Purchase of common stock returned to authorized but unissued (in shares)	(868,000)
Balances at Jun. 30, 2019	$ 276	219,262	183,820	(17,210)	655	386,803
Balances (in shares) at Jun. 30, 2019	27,626,000
Balances at Mar. 31, 2019	$ 280	225,243	177,303	(17,507)	(851)	384,468
Balances (in shares) at Mar. 31, 2019	28,004,000
Comprehensive income:
Net income	$ 0	0	9,643	0	0	9,643
Other comprehensive income	0	0	0	0	1,506	1,506
Total comprehensive income						11,149
ESOP shares committed to be released to Plan participants	0	141	0	297	0	438
Cash dividend	0	0	(3,126)	0	0	(3,126)
Stock compensation activity, net of tax	$ 0	102	0	0	0	102
Stock compensation activity, net of tax (in shares)	8,000
Stock compensation expense	$ 0	229	0	0	0	229
Purchase of common stock returned to authorized but unissued	$ (4)	(6,453)	0	0	0	(6,457)
Purchase of common stock returned to authorized but unissued (in shares)	(386,000)
Balances at Jun. 30, 2019	$ 276	219,262	183,820	(17,210)	655	386,803
Balances (in shares) at Jun. 30, 2019	27,626,000
Balances at Dec. 31, 2019	$ 271	211,997	197,393	(16,617)	642	$ 393,686
Balances (in shares) at Dec. 31, 2019	27,148,000					27,148,411
Comprehensive income:
Net income	$ 0	0	27,017	0	0	$ 27,017
Other comprehensive income	0	0	0	0	2,117	2,117
Total comprehensive income						29,134
ESOP shares committed to be released to Plan participants	0	228	0	594	0	822
Cash dividend	0	0	(18,547)	0	0	(18,547)
Stock compensation activity, net of tax	$ 1	530	0	0	0	531
Stock compensation activity, net of tax (in shares)	45,000
Stock compensation expense	$ 0	389	0	0	0	389
Purchase of common stock returned to authorized but unissued	$ (14)	(20,382)	0	0	0	(20,396)
Purchase of common stock returned to authorized but unissued (in shares)	(1,350,000)
Balances at Jun. 30, 2020	$ 258	192,762	205,863	(16,023)	2,759	$ 385,619
Balances (in shares) at Jun. 30, 2020	25,843,000					25,843,314
Balances at Mar. 31, 2020	$ 263	198,579	187,812	(16,320)	1,492	$ 371,826
Balances (in shares) at Mar. 31, 2020	26,275,000
Comprehensive income:
Net income	$ 0	0	20,948	0	0	20,948
Other comprehensive income	0	0	0	0	1,267	1,267
Total comprehensive income						22,215
ESOP shares committed to be released to Plan participants	0	76	0	297	0	373
Cash dividend	0	0	(2,897)	0	0	(2,897)
Stock compensation activity, net of tax	$ 0	78	0	0	0	78
Stock compensation activity, net of tax (in shares)	6,000
Stock compensation expense	$ 0	175	0	0	0	175
Purchase of common stock returned to authorized but unissued	$ (5)	(6,146)	0	0	0	(6,151)
Purchase of common stock returned to authorized but unissued (in shares)	(438,000)
Balances at Jun. 30, 2020	$ 258	$ 192,762	$ 205,863	$ (16,023)	$ 2,759	$ 385,619
Balances (in shares) at Jun. 30, 2020	25,843,000					25,843,314