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Note 5 - Loans - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Loans individually evaluated for impairment, allowance | $ 2,796 | $ 7,749
Loans individually evaluated for impairment, balance | 115,074 | 133,810
Loans collectively evaluated for impairment, allowance | 116,170 | 131,214
Loans collectively evaluated for impairment, balance | 11,086,201 | 10,029,642
Loans, allowance | 118,966 | 138,963
Loans | 11,201,275 | 10,163,452
Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 1,827 | 530
Loans individually evaluated for impairment, balance | 27,761 | 13,568
Loans collectively evaluated for impairment, allowance | 47,376 | 55,669
Loans collectively evaluated for impairment, balance | 2,220,426 | 2,303,295
Loans, allowance | 49,203 | 56,199
Loans | 2,248,187 | 2,316,863
Real Estate Construction Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance |  |
Loans individually evaluated for impairment, balance | 5,458 | 22,002
Loans collectively evaluated for impairment, allowance | 23,268 | 22,170
Loans collectively evaluated for impairment, balance | 542,630 | 419,541
Loans, allowance | 23,268 | 22,170
Loans | 548,088 | 441,543
Commercial Real Estate Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 573 | 6,792
Loans individually evaluated for impairment, balance | 64,470 | 81,776
Loans collectively evaluated for impairment, allowance | 34,291 | 42,648
Loans collectively evaluated for impairment, balance | 5,720,778 | 5,219,442
Loans, allowance | 34,864 | 49,440
Loans | 5,785,248 | 5,301,218
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 396 | 427
Loans individually evaluated for impairment, balance | 17,385 | 16,464
Loans collectively evaluated for impairment, allowance | 11,224 | 10,718
Loans collectively evaluated for impairment, balance | 2,598,374 | 2,084,871
Loans, allowance | 11,620 | 11,145
Loans | 2,615,759 | 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 | 11 | 9
Loans collectively evaluated for impairment, balance | 3,993 | 2,493
Loans, allowance | 11 | 9
Loans | $ 3,993 | $ 2,493

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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=66008989&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=66008989&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=66008989&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=66008989&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=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 + 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=65884687&loc=d3e4428-111522 + Details
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