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Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
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Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |  |
Individually evaluated for impairment | $ 43,773 | $ 34,597 | $ 43,298
Collectively evaluated for impairment | 3,388,775 | 2,910,561 | 2,753,542
Ending balance | 3,432,548 | 2,945,158 | 2,796,840
Commercial Loan [Member] |  |  |
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |  |
Individually evaluated for impairment | 17,785 | 9,614 | 12,791
Collectively evaluated for impairment | 780,704 | 684,736 | 669,622
Ending balance | 798,489 | 694,350 | 682,413
Commercial Real Estate Investment [Member] |  |  |
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |  |
Individually evaluated for impairment | 2,710 | 2,682 | 3,238
Collectively evaluated for impairment | 1,380,129 | 1,117,118 | 1,036,537
Ending balance | 1,382,839 | 1,119,800 | 1,039,775
Commercial Real Estate Owner Occupied [Member] |  |  |
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |  |
Individually evaluated for impairment | 5,054 | 7,574 | 8,547
Collectively evaluated for impairment | 332,368 | 309,917 | 325,531
Ending balance | 337,422 | 317,491 | 334,078
Residential Mortgage [Member] |  |  |
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |  |
Individually evaluated for impairment |  | 113 | 113
Collectively evaluated for impairment | 126,263 | 90,305 | 78,948
Ending balance | 126,263 | 90,418 | 79,061
Home Equity Line of Credit [Member] |  |  |
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |  |
Individually evaluated for impairment | 745 | 682 | 570
Collectively evaluated for impairment | 106,546 | 109,560 | 108,319
Ending balance | 107,291 | 110,242 | 108,889
Consumer, Other [Member] |  |  |
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |  |
Individually evaluated for impairment |  | 70 | 45
Collectively evaluated for impairment | 3,662 | 3,961 | 9,314
Ending balance | 3,662 | 4,031 | 9,359
Construction Loans [Member] |  |  |
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items] |  |  |
Individually evaluated for impairment | 17,479 | 13,862 | 17,994
Collectively evaluated for impairment | 659,103 | 594,964 | 525,271
Ending balance | $ 676,582 | $ 608,826 | $ 543,265

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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=35738203&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=35738203&loc=SL6953423-111524 + Details
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- Definition 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 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: 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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