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Note 8 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Balance | $ 131,256 | [1] | $ 169,680 | $ 166,538 | $ 123,224
Provision/(reversal) for possible credit losses | 3,000 |  | 12,500 | (15,710) | 62,500
Charge-offs | (2,652) |  | (6,956) | (19,502) | (13,383)
Recoveries | (341) |  | (3,906) | (2,179) | (6,789)
Net (charge-offs)/recoveries | (2,311) |  | (3,050) | (17,323) | (6,594)
Balance | 131,945 |  | 179,130 | 131,945 | 179,130
Recoveries | 341 |  | 3,906 | 2,179 | 6,789
Reserve for impaired loans |  |  | 8,495 |  | 8,495
Reserve for non-impaired loans |  |  | 170,635 |  | 170,635
Reserve for off-balance sheet credit commitments |  |  | 5,663 |  | 5,663
Commitments to Extend Credit [Member] |  |  |  |  |
Balance | 8,050 | [1] |  | 5,880 |
Provision/(reversal) for possible credit losses | 50 |  |  | (3,798) |
Balance | 8,100 |  |  | 8,100 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Balance |  |  |  | (1,560) |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | 6,018 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Balance |  |  |  | 164,978 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | 11,898 |
Commercial Portfolio Segment [Member] |  |  |  |  |
Balance | 40,067 | [1] | 82,256 | 68,742 | 57,021
Provision/(reversal) for possible credit losses | 674 |  | 298 | 18,891 | 29,402
Charge-offs | (2,649) |  | (6,956) | (19,499) | (13,383)
Recoveries | (121) |  | (3,796) | (1,545) | (6,354)
Net (charge-offs)/recoveries | (2,528) |  | (3,160) | (17,954) | (7,029)
Balance | 38,213 |  | 79,394 | 38,213 | 79,394
Recoveries | 121 |  | 3,796 | 1,545 | 6,354
Reserve for impaired loans |  |  | 7,704 |  | 7,704
Reserve for non-impaired loans |  |  | 71,690 |  | 71,690
Reserve for off-balance sheet credit commitments |  |  | 4,297 |  | 4,297
Commercial Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance | 4,388 | [1] |  | 4,802 |
Provision/(reversal) for possible credit losses | 329 |  |  | (3,321) |
Balance | 4,717 |  |  | 4,717 |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Balance |  |  |  | (31,466) |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | 3,236 |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Balance |  |  |  | 37,276 |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | 8,038 |
Real Estate Construction Portfolio Segment [Member] |  |  |  |  |
Balance | 6,119 | [1] | 26,700 | 30,854 | 19,474
Provision/(reversal) for possible credit losses | 149 |  | 6,012 | (279) | 13,238
Charge-offs | 0 |  | 0 | 0 | 0
Recoveries | (76) |  | 0 | (76) | 0
Net (charge-offs)/recoveries | 76 |  | 0 | 76 | 0
Balance | 6,344 |  | 32,712 | 6,344 | 32,712
Recoveries | 76 |  | 0 | 76 | 0
Reserve for impaired loans |  |  | 0 |  | 0
Reserve for non-impaired loans |  |  | 32,712 |  | 32,712
Reserve for off-balance sheet credit commitments |  |  | 896 |  | 896
Real Estate Construction Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance | 3,581 | [1] |  | 690 |
Provision/(reversal) for possible credit losses | (396) |  |  | (640) |
Balance | 3,185 |  |  | 3,185 |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Balance |  |  |  | (24,307) |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | 3,135 |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Balance |  |  |  | 6,547 |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | 3,825 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Balance | 58,026 | [1] | 41,132 | 49,205 | 33,602
Provision/(reversal) for possible credit losses | 2,786 |  | 5,438 | (23,526) | 12,718
Charge-offs | 0 |  | 0 | 0 | 0
Recoveries | (144) |  | (95) | (284) | (345)
Net (charge-offs)/recoveries | 144 |  | 95 | 284 | 345
Balance | 60,956 |  | 46,665 | 60,956 | 46,665
Recoveries | 144 |  | 95 | 284 | 345
Reserve for impaired loans |  |  | 582 |  | 582
Reserve for non-impaired loans |  |  | 46,083 |  | 46,083
Reserve for off-balance sheet credit commitments |  |  | 172 |  | 172
Commercial Real Estate Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance | 81 | [1] |  | 101 |
Provision/(reversal) for possible credit losses | 117 |  |  | 163 |
Balance | 198 |  |  | 198 |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Balance |  |  |  | 34,993 |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | (66) |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Balance |  |  |  | 84,198 |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | 35 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |
Balance | 27,043 | [1] | 19,592 | 17,737 | 13,108
Provision/(reversal) for possible credit losses | (609) |  | 752 | (10,788) | 7,161
Charge-offs | (3) |  | 0 | (3) | 0
Recoveries | 0 |  | (15) | (274) | (90)
Net (charge-offs)/recoveries | (3) |  | 15 | 271 | 90
Balance | 26,431 |  | 20,359 | 26,431 | 20,359
Recoveries | 0 |  | 15 | 274 | 90
Reserve for impaired loans |  |  | 209 |  | 209
Reserve for non-impaired loans |  |  | 20,150 |  | 20,150
Reserve for off-balance sheet credit commitments |  |  | 294 |  | 294
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance | 0 | [1] |  | 284 |
Provision/(reversal) for possible credit losses | 0 |  |  | 0 |
Balance | 0 |  |  | 0 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Balance |  |  |  | 19,211 |
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] |  |  |  |  |
Balance |  |  |  | (284) |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Balance |  |  |  | 36,948 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | 0 |
Installment and Other Loans [Member ] |  |  |  |  |
Balance | 1 | [1] | 0 | 0 | 19
Provision/(reversal) for possible credit losses | 0 |  | 0 | (8) | (19)
Charge-offs | 0 |  | 0 | 0 | 0
Recoveries | 0 |  | 0 | 0 | 0
Net (charge-offs)/recoveries | 0 |  | 0 | 0 | 0
Balance | 1 |  | 0 | 1 | 0
Recoveries | 0 |  | 0 | (0) | 0
Reserve for impaired loans |  |  | 0 |  | 0
Reserve for non-impaired loans |  |  | 0 |  | 0
Reserve for off-balance sheet credit commitments |  |  | $ 4 |  | $ 4
Installment and Other Loans [Member ] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance | 0 | [1] |  | 3 |
Provision/(reversal) for possible credit losses | 0 |  |  | 0 |
Balance | $ 0 |  |  | 0 |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
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] |  |  |  |  |
Balance |  |  |  | (3) |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Balance |  |  |  | 9 |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |
Balance |  |  |  | $ 0 |
[1] | Balance sheet amounts previously reported for the impact of the initial adoption of CECL on January 1, 2021 have been corrected. The correction decreased the allowance for loan losses by $2.2 million and increased the allowance for unfunded credit commitments by $5.5 million.

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