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Note 8 - Loans (Details) - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Loans individually evaluated for impairment |  |
Loans individually evaluated for impairment, allowance | $ 14,323 | $ 11,798
Loans individually evaluated for impairment, balance | 161,121 | 174,519
Loans collectively evaluated for impairment |  |
Loans collectively evaluated for impairment, allowance | 135,753 | 149,622
Loans collectively evaluated for impairment, balance | 9,878,811 | 8,739,561
Loans, allowance | 150,076 | 161,420
Loans | 10,039,932 | 8,914,080
Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment |  |
Loans individually evaluated for impairment, allowance | 7,561 | 1,263
Loans individually evaluated for impairment, balance | 27,630 | 23,489
Loans collectively evaluated for impairment |  |
Loans collectively evaluated for impairment, allowance | 47,316 | 46,238
Loans collectively evaluated for impairment, balance | 2,334,429 | 2,359,004
Loans, allowance | 54,877 | 47,501
Loans | 2,362,059 | 2,382,493
Real Estate Construction Portfolio Segment [Member] |  |
Loans individually evaluated for impairment |  |
Loans individually evaluated for impairment, allowance |  | 1,077
Loans individually evaluated for impairment, balance | 22,292 | 25,728
Loans collectively evaluated for impairment |  |
Loans collectively evaluated for impairment, allowance | 26,466 | 26,575
Loans collectively evaluated for impairment, balance | 382,986 | 272,926
Loans, allowance | 26,466 | 27,652
Loans | 405,278 | 298,654
Commercial Real Estate Portfolio Segment [Member] |  |
Loans individually evaluated for impairment |  |
Loans individually evaluated for impairment, allowance | 6,389 | 8,993
Loans individually evaluated for impairment, balance | 95,019 | 109,194
Loans collectively evaluated for impairment |  |
Loans collectively evaluated for impairment, allowance | 49,644 | 65,680
Loans collectively evaluated for impairment, balance | 5,180,551 | 4,377,249
Loans, allowance | 56,033 | 74,673
Loans | 5,275,570 | 4,486,443
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans individually evaluated for impairment |  |
Loans individually evaluated for impairment, allowance | 373 | 465
Loans individually evaluated for impairment, balance | 16,180 | 16,108
Loans collectively evaluated for impairment |  |
Loans collectively evaluated for impairment, allowance | 12,304 | 11,113
Loans collectively evaluated for impairment, balance | 1,975,074 | 1,726,830
Loans, allowance | 12,677 | 11,578
Loans | 1,991,254 | 1,742,938
Consumer Portfolio Segment [Member] |  |
Loans collectively evaluated for impairment |  |
Loans collectively evaluated for impairment, allowance | 23 | 16
Loans collectively evaluated for impairment, balance | 5,771 | 3,552
Loans, allowance | 23 | 16
Loans | $ 5,771 | $ 3,552

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible 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 (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible 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 (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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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 + Details
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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 + Details
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- Definition 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=49124121&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=49124121&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 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition 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=28367877&loc=d3e4428-111522 + Details
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