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Note 8 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Beginning Balance | $ 166,538 | $ 123,224
Provision/(reversal) for possible credit losses | (12,110) | 25,000
Charge-offs | (9,138) | (1,321)
Recoveries | (1,380) | (1,370)
Net (charge-offs)/recoveries | (7,758) | 49
Ending Balance | 147,264 | 148,273
Recoveries | 1,380 | 1,370
Reserve for impaired loans |  | 3,451
Reserve for non-impaired loans |  | 144,822
Reserve for off-balance sheet credit commitments |  | 3,013
Commitments to Extend Credit [Member] |  |
Beginning Balance | 5,880 |
Provision/(reversal) for possible credit losses | (1,449) |
Ending Balance | 4,970 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |
Beginning Balance | 594 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 539 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |
Beginning Balance | 167,132 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 6,419 |
Commercial Portfolio Segment [Member] |  |
Beginning Balance | 68,742 | 57,021
Provision/(reversal) for possible credit losses | 12,627 | 10,891
Charge-offs | (9,138) | (1,321)
Recoveries | (1,269) | (1,208)
Net (charge-offs)/recoveries | (7,869) | (113)
Ending Balance | 44,752 | 67,799
Recoveries | 1,269 | 1,208
Reserve for impaired loans |  | 2,827
Reserve for non-impaired loans |  | 64,972
Reserve for off-balance sheet credit commitments |  | 1,296
Commercial Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 4,802 |
Provision/(reversal) for possible credit losses | 125 |
Ending Balance | 1,580 |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |
Beginning Balance | (28,748) |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | (3,347) |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |
Beginning Balance | 39,994 |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 1,455 |
Real Estate Construction Portfolio Segment [Member] |  |
Beginning Balance | 30,854 | 19,474
Provision/(reversal) for possible credit losses | 446 | 3,748
Charge-offs | 0 | 0
Recoveries | 0 | 0
Net (charge-offs)/recoveries | 0 | 0
Ending Balance | 5,968 | 23,222
Recoveries | (0) | 0
Reserve for impaired loans |  | 0
Reserve for non-impaired loans |  | 23,222
Reserve for off-balance sheet credit commitments |  | 1,233
Real Estate Construction Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 690 |
Provision/(reversal) for possible credit losses | (1,574) |
Ending Balance | 3,390 |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |
Beginning Balance | (25,332) |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 4,274 |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |
Beginning Balance | 5,522 |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 4,964 |
Commercial Real Estate Portfolio Segment [Member] |  |
Beginning Balance | 49,205 | 33,602
Provision/(reversal) for possible credit losses | (18,946) | 6,129
Charge-offs | 0 | 0
Recoveries | (95) | (155)
Net (charge-offs)/recoveries | 95 | 155
Ending Balance | 65,689 | 39,886
Recoveries | 95 | 155
Reserve for impaired loans |  | 405
Reserve for non-impaired loans |  | 39,481
Reserve for off-balance sheet credit commitments |  | 177
Commercial Real Estate Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 101 |
Provision/(reversal) for possible credit losses | 0 |
Ending Balance | 0 |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |
Beginning Balance | 35,335 |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | (101) |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |
Beginning Balance | 84,540 |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 0 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Beginning Balance | 17,737 | 13,108
Provision/(reversal) for possible credit losses | (6,231) | 4,251
Charge-offs | 0 | 0
Recoveries | (16) | (7)
Net (charge-offs)/recoveries | 16 | 7
Ending Balance | 30,852 | 17,366
Recoveries | 16 | 7
Reserve for impaired loans |  | 219
Reserve for non-impaired loans |  | 17,147
Reserve for off-balance sheet credit commitments |  | 304
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 284 |
Provision/(reversal) for possible credit losses | 0 |
Ending Balance | 0 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |
Beginning Balance | 19,330 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | (284) |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |
Beginning Balance | 37,067 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 0 |
Installment and Other Loans [Member ] |  |
Beginning Balance | 0 | 19
Provision/(reversal) for possible credit losses | (6) | (19)
Charge-offs | 0 | 0
Recoveries | 0 | 0
Net (charge-offs)/recoveries | 0 | 0
Ending Balance | 3 | 0
Recoveries | (0) | 0
Reserve for impaired loans |  | 0
Reserve for non-impaired loans |  | 0
Reserve for off-balance sheet credit commitments |  | $ 3
Installment and Other Loans [Member ] | Commitments to Extend Credit [Member] |  |
Beginning Balance | 3 |
Provision/(reversal) for possible credit losses | 0 |
Ending Balance | 0 |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |
Beginning Balance | 9 |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | (3) |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |
Beginning Balance | 9 |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |
Beginning Balance | $ 0 |

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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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