PSB HOLDINGS, INC. ACQUISITION OF MARATHON STATE BANK (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Marathon State Bank
Accounting date			Jun. 01, 2012
Cash purchase price	$ 5,505
Cash and due from banks	21,120	14,805	20,392
Securities			50,547
Loans receivable	473,249	437,557
Short-term commercial paper and bankers' acceptances			11,713
Foreclosed assets
Premises and equipment, net	10,275	9,928	402
Core deposit intangible asset
Accrued interest receivable and other assets			550
Total fair value of assets acquired	107,000		107,364
Non-interest-bearing	79,201	75,298	23,255
Interest-bearing	468,637	406,211	77,611
Accrued expenses and other liabilities	6,801	6,449	142
Total fair value of liabilities assumed			101,008
Fair value of net assets acquired			6,356
Gain on bargain purchase			$ 851