Note 7 - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member]
Loans individually evaluated for impairment, allowance	$ 1,395	$ 530
Loans individually evaluated for impairment, balance	18,200	13,568
Loans collectively evaluated for impairment, allowance	49,195	55,669
Loans collectively evaluated for impairment, balance	2,169,847	2,303,295
Loans, allowance	50,590	56,199
Loans	2,188,047	2,316,863
Real Estate Construction Portfolio Segment [Member]
Loans individually evaluated for impairment, allowance
Loans individually evaluated for impairment, balance	6,081	22,002
Loans collectively evaluated for impairment, allowance	10,753	22,170
Loans collectively evaluated for impairment, balance	475,739	419,541
Loans, allowance	10,753	22,170
Loans	481,820	441,543
Commercial Real Estate Portfolio Segment [Member]
Loans individually evaluated for impairment, allowance	5,891	6,792
Loans individually evaluated for impairment, balance	85,529	81,776
Loans collectively evaluated for impairment, allowance	40,199	42,648
Loans collectively evaluated for impairment, balance	5,445,657	5,219,442
Loans, allowance	46,090	49,440
Loans	5,531,186	5,301,218
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans individually evaluated for impairment, allowance	438	427
Loans individually evaluated for impairment, balance	18,036	16,464
Loans collectively evaluated for impairment, allowance	15,065	10,718
Loans collectively evaluated for impairment, balance	2,300,831	2,084,871
Loans, allowance	15,503	11,145
Loans	2,318,867	2,101,335
Consumer Portfolio Segment [Member]
Loans individually evaluated for impairment, allowance
Loans individually evaluated for impairment, balance
Loans collectively evaluated for impairment, allowance	12	9
Loans collectively evaluated for impairment, balance	3,180	2,493
Loans, allowance	12	9
Loans	3,180	2,493
Loans individually evaluated for impairment, allowance	7,724	7,749
Loans individually evaluated for impairment, balance	127,846	133,810
Loans collectively evaluated for impairment, allowance	115,224	131,214
Loans collectively evaluated for impairment, balance	10,395,254	10,029,642
Loans, allowance	122,948	138,963
Loans	$ 10,523,100	$ 10,163,452

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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