Borrowings Textuals (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	May. 31, 2015	Dec. 31, 2014	Jun. 30, 2014
Borrowings [Line Items]
Maximum original maturity term of short-term borrowings	30 days
Long-term Federal Home Loan Bank Advances	$ 81,469,000		$ 0	$ 0
Federal Home Loan Bank, Advances, Weighted Average Interest Rate	1.33%
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 1,240,000,000
Federal Home Loan Bank, Advances, Maturities Summary, Due Remainder of Current Year	100,000
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two	7,100,000
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Three	47,100,000
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Four	17,100,000
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Five	100,000
Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate, after Five Years	10,000,000
Securities Sold under Agreements to Repurchase	23,649,000		0	0
Securities Sold Under Agreements to Repurchase, Maturities Summary, Due Remainder of Current Year	3,200,000
Securities Sold Under Agreements to Repurchase, Maturities, Due in Year Two	8,300,000
Securities Sold Under Agreements to Repurchase, Maturities, Due in Year Three	12,100,000
nonrevolving line of credit	$ 25,000,000		0	0
Line of Credit Facility, Interest Rate at Period End	2.134%
Trust Preferred Investment Security of Non Public Bank Company		$ 10,000,000	10,000,000	10,000,000
subordinated debt par value	$ 1,000
Subordinated Debt	18,372,000		$ 0	$ 0
Lake Michigan Financial Corp [Member]
Borrowings [Line Items]
Long-term Federal Home Loan Bank Advances		81,500,000
Securities Sold under Agreements to Repurchase		$ 23,700,000
LMFCTI [Member]
Borrowings [Line Items]
Subordinated Debt	$ 10,300,000
Subordinated Borrowing, Minimum Interest Rate plus LIBOR	3.45%
Subordinated Borrowing, Interest Rate, Effective Percentage	3.73%
LMFCTII [Member]
Borrowings [Line Items]
Subordinated Debt	$ 8,200,000
Subordinated Borrowing, Minimum Interest Rate plus LIBOR	2.70%
Subordinated Borrowing, Interest Rate, Effective Percentage	2.98%