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Note 4 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans past due | $ 216,542 | $ 131,462
Non-accrual loans | 67,684 | 40,523
Loans not past due | 15,427,854 | 14,944,019
Loans | 15,644,396 | 15,075,481
Loans, amortized cost, greater than 90 days and accruing | 4,982 | 6,409
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 118,402 | 64,249
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 25,474 | 20,281
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 4,982 | 6,409
Commercial Portfolio Segment [Member] |  |
Loans past due | 81,817 | 60,425
Non-accrual loans | 23,087 | 19,381
Loans not past due | 2,755,016 | 2,718,319
Loans | 2,836,833 | 2,778,744
Loans, amortized cost, greater than 90 days and accruing | 2,947 | 6,409
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 52,601 | 24,681
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 3,182 | 9,954
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 2,947 | 6,409
Real Estate Construction Portfolio Segment [Member] |  |
Loans past due | 10,543 | 17,179
Non-accrual loans | 4,286 | 4,580
Loans not past due | 668,949 | 562,685
Loans | 679,492 | 579,864
Loans, amortized cost, greater than 90 days and accruing | 0 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 6,257 | 5,846
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 0 | 6,753
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 0 | 0
Commercial Real Estate Portfolio Segment [Member] |  |
Loans past due | 99,005 | 20,231
Non-accrual loans | 33,715 | 9,928
Loans not past due | 7,456,022 | 7,255,031
Loans | 7,555,027 | 7,275,262
Loans, amortized cost, greater than 90 days and accruing | 2,035 | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 45,186 | 7,694
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 18,069 | 2,609
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 2,035 | 0
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans past due | 25,134 | 33,627
Non-accrual loans | 6,596 | 6,634
Loans not past due | 4,544,810 | 4,402,934
Loans | 4,569,944 | 4,436,561
Loans, amortized cost, greater than 90 days and accruing | 0 | 0
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 14,315 | 26,028
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 4,223 | 965
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 0 | 0
Installment and Other Loans [Member ] |  |
Loans past due | 43 | 0
Non-accrual loans | 0 | 0
Loans not past due | 3,057 | 5,050
Loans | 3,100 | 5,050
Loans, amortized cost, greater than 90 days and accruing | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 43 | 0
Installment and Other Loans [Member ] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | $ 0 | $ 0

X
- Definition Amount of financing receivable 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details
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