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Note 5 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Recorded investment in loans:
Individually evaluated for impairment	$ 31,516	$ 45,310
Collectively evaluated for impairment	4,966,852	4,267,089
Ending balance	4,998,368	4,312,399
Commercial Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	13,008	17,612
Collectively evaluated for impairment	1,039,249	898,614
Ending balance	1,052,257	916,226
Income Producing Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	6,118	5,109
Collectively evaluated for impairment	2,109,360	1,698,063
Ending balance	2,115,478	1,703,172
Owner Occupied Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	1,753	6,891
Collectively evaluated for impairment	496,350	454,690
Ending balance	498,103	461,581
Real Estate Mortgage Residential [Member]
Recorded investment in loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	147,365	148,018
Ending balance	147,365	148,018
Construction Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	10,454	14,241
Collectively evaluated for impairment	1,054,922	837,223
Ending balance	1,065,376	851,464
Home Equity Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	161	1,398
Collectively evaluated for impairment	112,724	121,138
Ending balance	112,885	122,536
Other Consumer Portfolio Segment [Member]
Recorded investment in loans:
Individually evaluated for impairment	22	59
Collectively evaluated for impairment	6,882	109,343
Ending balance	$ 6,904	$ 109,402

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- Definition

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

+ 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 (h)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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- Definition

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

+ 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 (h)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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=28367877&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

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