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Note 8 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Beginning Balance | $ 148,273 | $ 122,555 | $ 123,224 | $ 122,391
Provision for possible credit losses | 25,000 | 0 | 50,000 | 0
Charge-offs | (5,106) | (1,713) | (6,427) | (2,944)
Recoveries | 1,513 | 1,809 | 2,883 | 3,204
Net (charge-offs)/recoveries | (3,593) | 96 | (3,544) | 260
Ending Balance | 169,680 | 122,651 | 169,680 | 122,651
Reserve for impaired loans | 7,525 | 1,686 | 7,525 | 1,686
Reserve for non-impaired loans | 162,155 | 120,965 | 162,155 | 120,965
Reserve for off-balance sheet credit commitments | 4,663 | 4,550 | 4,663 | 4,550
Commercial Portfolio Segment [Member] |  |  |  |
Beginning Balance | 67,799 | 54,750 | 57,021 | 54,978
Provision for possible credit losses | 18,213 | (100) | 29,104 | 862
Charge-offs | (5,106) | (1,713) | (6,427) | (2,944)
Recoveries | 1,350 | 1,356 | 2,558 | 1,397
Net (charge-offs)/recoveries | (3,756) | (357) | (3,869) | (1,547)
Ending Balance | 82,256 | 54,293 | 82,256 | 54,293
Reserve for impaired loans | 6,895 | 832 | 6,895 | 832
Reserve for non-impaired loans | 75,361 | 53,461 | 75,361 | 53,461
Reserve for off-balance sheet credit commitments | 3,581 | 2,090 | 3,581 | 2,090
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Beginning Balance | 23,222 | 20,723 | 19,474 | 19,626
Provision for possible credit losses | 3,478 | 257 | 7,226 | 310
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 30 | 0 | 1,074
Net (charge-offs)/recoveries | 0 | 30 | 0 | 1,074
Ending Balance | 26,700 | 21,010 | 26,700 | 21,010
Reserve for impaired loans | 0 | 0 | 0 | 0
Reserve for non-impaired loans | 26,700 | 21,010 | 26,700 | 21,010
Reserve for off-balance sheet credit commitments | 666 | 2,029 | 666 | 2,029
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Beginning Balance | 39,886 | 33,073 | 33,602 | 33,487
Provision for possible credit losses | 1,151 | (180) | 7,280 | (746)
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 95 | 261 | 250 | 413
Net (charge-offs)/recoveries | 95 | 261 | 250 | 413
Ending Balance | 41,132 | 33,154 | 41,132 | 33,154
Reserve for impaired loans | 323 | 620 | 323 | 620
Reserve for non-impaired loans | 40,809 | 32,534 | 40,809 | 32,534
Reserve for off-balance sheet credit commitments | 117 | 137 | 117 | 137
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Beginning Balance | 17,366 | 13,975 | 13,108 | 14,282
Provision for possible credit losses | 2,158 | 27 | 6,409 | (438)
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 68 | 162 | 75 | 320
Net (charge-offs)/recoveries | 68 | 162 | 75 | 320
Ending Balance | 19,592 | 14,164 | 19,592 | 14,164
Reserve for impaired loans | 307 | 234 | 307 | 234
Reserve for non-impaired loans | 19,285 | 13,930 | 19,285 | 13,930
Reserve for off-balance sheet credit commitments | 297 | 290 | 297 | 290
Installment and Other Loans [Member ] |  |  |  |
Beginning Balance | 0 | 34 | 19 | 18
Provision for possible credit losses | 0 | (4) | (19) | 12
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Net (charge-offs)/recoveries | 0 | 0 | 0 | 0
Ending Balance | 0 | 30 | 0 | 30
Reserve for impaired loans | 0 | 0 | 0 | 0
Reserve for non-impaired loans | 0 | 30 | 0 | 30
Reserve for off-balance sheet credit commitments | $ 2 | $ 4 | $ 2 | $ 4

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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