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Note 4 - Loans - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loans individually evaluated for impairment, allowance | $ 3,236 | $ 3,802
Loans individually evaluated for impairment, balance | 75,859 | 106,886
Loans collectively evaluated for impairment, allowance | 119,988 | 118,589
Loans collectively evaluated for impairment, balance | 14,999,622 | 13,888,902
Loans, allowance | 123,224 | 122,391
Loans | 15,075,481 | 13,995,788
Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 2,543 | 1,837
Loans individually evaluated for impairment, balance | 24,596 | 36,940
Loans collectively evaluated for impairment, allowance | 54,478 | 53,141
Loans collectively evaluated for impairment, balance | 2,754,148 | 2,705,025
Loans, allowance | 57,021 | 54,978
Loans | 2,778,744 | 2,741,965
Real Estate Construction Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 0 | 0
Loans individually evaluated for impairment, balance | 4,580 | 4,873
Loans collectively evaluated for impairment, allowance | 19,474 | 19,626
Loans collectively evaluated for impairment, balance | 575,284 | 576,581
Loans, allowance | 19,474 | 19,626
Loans | 579,864 | 581,454
Commercial Real Estate Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 473 | 877
Loans individually evaluated for impairment, balance | 35,070 | 51,471
Loans collectively evaluated for impairment, allowance | 33,129 | 32,610
Loans collectively evaluated for impairment, balance | 7,240,192 | 6,672,729
Loans, allowance | 33,602 | 33,487
Loans | 7,275,262 | 6,724,200
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 220 | 1,088
Loans individually evaluated for impairment, balance | 11,613 | 13,602
Loans collectively evaluated for impairment, allowance | 12,888 | 13,194
Loans collectively evaluated for impairment, balance | 4,424,948 | 3,930,218
Loans, allowance | 13,108 | 14,282
Loans | 4,436,561 | 3,943,820
Consumer Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 0 | 0
Loans individually evaluated for impairment, balance | 0 | 0
Loans collectively evaluated for impairment, allowance | 19 | 18
Loans collectively evaluated for impairment, balance | 5,050 | 4,349
Loans, allowance | 19 | 18
Loans | $ 5,050 | $ 4,349

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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=118936363&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=118936363&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=118936363&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=118936363&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=118936363&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=118939070&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=118936363&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=118952595&loc=d3e4428-111522 + Details
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