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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, 2020 | Dec. 31, 2019
--- | --- | ---
Loans individually evaluated for impairment, allowance | $ 6,429 | $ 3,236
Loans individually evaluated for impairment, balance | 95,405 | 75,859
Loans collectively evaluated for impairment, allowance | 160,109 | 119,988
Loans collectively evaluated for impairment, balance | 15,548,991 | 14,999,622
Loans, allowance | 166,538 | 123,224
Loans | 15,644,396 | 15,075,481
Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 1,030 | 2,543
Loans individually evaluated for impairment, balance | 27,070 | 24,596
Loans collectively evaluated for impairment, allowance | 67,712 | 54,478
Loans collectively evaluated for impairment, balance | 2,809,763 | 2,754,148
Loans, allowance | 68,742 | 57,021
Loans | 2,836,833 | 2,778,744
Real Estate Construction Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 0 | 0
Loans individually evaluated for impairment, balance | 4,286 | 4,580
Loans collectively evaluated for impairment, allowance | 30,854 | 19,474
Loans collectively evaluated for impairment, balance | 675,206 | 575,284
Loans, allowance | 30,854 | 19,474
Loans | 679,492 | 579,864
Commercial Real Estate Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 5,254 | 473
Loans individually evaluated for impairment, balance | 53,289 | 35,070
Loans collectively evaluated for impairment, allowance | 43,951 | 33,129
Loans collectively evaluated for impairment, balance | 7,501,738 | 7,240,192
Loans, allowance | 49,205 | 33,602
Loans | 7,555,027 | 7,275,262
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans individually evaluated for impairment, allowance | 145 | 220
Loans individually evaluated for impairment, balance | 10,760 | 11,613
Loans collectively evaluated for impairment, allowance | 17,592 | 12,888
Loans collectively evaluated for impairment, balance | 4,559,184 | 4,424,948
Loans, allowance | 17,737 | 13,108
Loans | 4,569,944 | 4,436,561
Installment and Other Loans [Member ] |  |
Loans individually evaluated for impairment, allowance | 0 | 0
Loans individually evaluated for impairment, balance | 0 | 0
Loans collectively evaluated for impairment, allowance | 0 | 19
Loans collectively evaluated for impairment, balance | 3,100 | 5,050
Loans, allowance | 0 | 19
Loans | $ 3,100 | $ 5,050

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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=121611835&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=121611835&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=121611835&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=121611835&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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: 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=121614798&loc=d3e15032-111544 Reference 3: 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=121611835&loc=SL6953423-111524 Reference 4: 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=121593590&loc=d3e4428-111522 + Details
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