PSB HOLDINGS, INC. ACQUISITION OF MARATHON STATE BANK (Details1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pro Forma with Marathon State Bank
Net Interest Income	$ 4,880	$ 4,866	$ 9,696	$ 9,630
Noninterest Income	2,323	1,197	3,565	2,594
Net Income	1,918	1,226	3,098	2,511
Earnings Per Share	$ 1.15	$ 0.74	$ 1.86	$ 1.52
PSB Holdings, Inc.
Pro Forma with Marathon State Bank
Net Interest Income	4,747	4,866	9,563	9,630
Noninterest Income	1,469	1,197	2,711	2,594
Net Income	1,364	1,226	2,544	2,511
Earnings Per Share	$ 0.82	$ 0.74	$ 1.53	$ 1.51
Marathon State Bank
Pro Forma with Marathon State Bank
Net Interest Income	382	443	808	879
Noninterest Income	860	10	872	26
Net Income	523	151	600	289
Earnings Per Share	$ 0.31	$ 0.09	$ 0.36	$ 0.18
Pro Forma with Marathon State Bank
Pro Forma with Marathon State Bank
Net Interest Income	5,129	5,309	10,371	10,509
Noninterest Income	2,329	1,207	3,583	2,620
Net Income	$ 1,887	$ 1,377	$ 3,144	$ 2,800
Earnings Per Share	$ 1.13	$ 0.83	$ 1.89	$ 1.69