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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 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 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 | $ 36,991 | $ 34,597 | $ 49,998
Collectively evaluated for impairment | 3,242,438 | 2,910,561 | 2,641,360
Ending balance | 3,279,429 | 2,945,158 | 2,691,358
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 | 17,405 | 9,614 | 16,407
Collectively evaluated for impairment | 709,206 | 684,736 | 620,216
Ending balance | 726,611 | 694,350 | 636,623
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 | 2,913 | 2,682 | 5,560
Collectively evaluated for impairment | 1,299,566 | 1,117,118 | 998,163
Ending balance | 1,302,479 | 1,119,800 | 1,003,723
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 | 3,230 | 7,574 | 8,580
Collectively evaluated for impairment | 326,843 | 309,917 | 302,755
Ending balance | 330,073 | 317,491 | 311,335
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 |
Collectively evaluated for impairment | 123,587 | 90,305 | 78,813
Ending balance | 123,587 | 90,418 | 78,813
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 | 561 | 682 | 561
Collectively evaluated for impairment | 108,370 | 109,560 | 108,004
Ending balance | 108,931 | 110,242 | 108,565
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 | 11
Collectively evaluated for impairment | 7,116 | 3,961 | 7,970
Ending balance | 7,116 | 4,031 | 7,981
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 | 12,882 | 13,862 | 18,879
Collectively evaluated for impairment | 667,750 | 594,964 | 525,439
Ending balance | $ 680,632 | $ 608,826 | $ 544,318

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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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