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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, 2018 | Dec. 31, 2017
--- | --- | ---
Loans individually evaluated for impairment, allowance | $ 3,802 | $ 2,134
Loans individually evaluated for impairment, balance | 106,886 | 117,353
Loans collectively evaluated for impairment, allowance | 118,589 | 121,145
Loans collectively evaluated for impairment, balance | 13,888,902 | 12,752,937
Loans, allowance | 122,391 | 123,279
Loans | 13,995,788 | 12,870,290
Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 1,837 | 43
Loans individually evaluated for impairment, balance | 36,940 | 43,495
Loans collectively evaluated for impairment, allowance | 53,141 | 49,753
Loans collectively evaluated for impairment, balance | 2,705,025 | 2,417,771
Loans, allowance | 54,978 | 49,796
Loans | 2,741,965 | 2,461,266
Real Estate Construction Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance |  |
Loans individually evaluated for impairment, balance | 4,873 | 8,185
Loans collectively evaluated for impairment, allowance | 19,626 | 24,838
Loans collectively evaluated for impairment, balance | 576,581 | 670,620
Loans, allowance | 19,626 | 24,838
Loans | 581,454 | 678,805
Commercial Real Estate Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 877 | 1,738
Loans individually evaluated for impairment, balance | 51,471 | 52,664
Loans collectively evaluated for impairment, allowance | 32,610 | 35,872
Loans collectively evaluated for impairment, balance | 6,672,729 | 6,430,031
Loans, allowance | 33,487 | 37,610
Loans | 6,724,200 | 6,482,695
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 1,088 | 353
Loans individually evaluated for impairment, balance | 13,602 | 13,009
Loans collectively evaluated for impairment, allowance | 13,194 | 10,660
Loans collectively evaluated for impairment, balance | 3,930,218 | 3,229,345
Loans, allowance | 14,282 | 11,013
Loans | 3,943,820 | 3,242,354
Consumer Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance |  |
Loans individually evaluated for impairment, balance |  |
Loans collectively evaluated for impairment, allowance | 18 | 22
Loans collectively evaluated for impairment, balance | 4,349 | 5,170
Loans, allowance | 18 | 22
Loans | $ 4,349 | $ 5,170

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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