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Note 2 - Business Combination (Details) - Acquired Loans Fair Value - Firstbank Corporation [Member]	Jun. 01, 2014 USD ($)
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	$ 943,662,000
Nonperforming Financial Instruments [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	25,365,000
Performing Financial Instruments [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	918,297,000
Commercial Portfolio Segment [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	590,198,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	164,194,000
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	390,989,000
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	35,015,000
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	15,140,000
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial and Industrial [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	878,000
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Real Estate Loan [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	12,973,000
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	1,289,000
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	575,058,000
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial and Industrial [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	163,316,000
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Real Estate Loan [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	378,016,000
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Construction Loans [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	33,726,000
Consumer Portfolio Segment [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	353,464,000
Consumer Portfolio Segment [Member] | Construction Loans [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	12,951,000
Consumer Portfolio Segment [Member] | Residential Mortgages [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	226,347,000
Consumer Portfolio Segment [Member] | Installment [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	61,824,000
Consumer Portfolio Segment [Member] | Home Equity Lines [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	52,342,000
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	10,225,000
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	76,000
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Residential Mortgages [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	9,694,000
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Installment [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	167,000
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Home Equity Lines [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	288,000
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	343,239,000
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] | Construction Loans [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	12,875,000
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] | Residential Mortgages [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	216,653,000
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] | Installment [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	61,657,000
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity Lines [Member]
Note 2 - Business Combination (Details) - Acquired Loans Fair Value [Line Items]
Loans	$ 52,054,000

X

- References

No definition available.

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- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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