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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Beginning Balance |  | $ 145,110 | [1] | $ 148,273 | $ 166,538 | $ 123,224
Provision/(reversal) for possible credit losses |  | (6,600) |  | 25,000 | (18,710) | 50,000
Charge-offs |  | (7,712) |  | (5,106) | (16,850) | (6,427)
Recoveries |  | (458) |  | (1,513) | (1,838) | (2,883)
Net (charge-offs)/recoveries |  | (7,254) |  | (3,593) | (15,012) | (3,544)
Ending Balance |  | 131,256 |  | 169,680 | 131,256 | 169,680
Recoveries |  | 458 |  | 1,513 | 1,838 | 2,883
Reserve for impaired loans |  |  |  | 7,525 |  | 7,525
Reserve for non-impaired loans |  |  |  | 162,155 |  | 162,155
Reserve for off-balance sheet credit commitments |  |  |  | 4,663 |  | 4,663
Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance |  | 10,450 | [1] |  | 5,880 |
Provision/(reversal) for possible credit losses |  | (2,400) |  |  | (3,848) |
Ending Balance |  | 8,050 |  |  | 8,050 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | (1,560) |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 6,018 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 164,978 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 11,898 |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Beginning Balance |  | 42,034 | [1] | 67,799 | 68,742 | 57,021
Provision/(reversal) for possible credit losses |  | 5,590 |  | 18,213 | 18,216 | 29,104
Charge-offs |  | (7,712) |  | (5,106) | (16,850) | (6,427)
Recoveries |  | (155) |  | (1,350) | (1,425) | (2,558)
Net (charge-offs)/recoveries |  | (7,557) |  | (3,756) | (15,425) | (3,869)
Ending Balance |  | 40,067 |  | 82,256 | 40,067 | 82,256
Recoveries |  | 155 |  | 1,350 | 1,425 | 2,558
Reserve for impaired loans |  |  |  | 6,895 |  | 6,895
Reserve for non-impaired loans |  |  |  | 75,361 |  | 75,361
Reserve for off-balance sheet credit commitments |  |  |  | 3,581 |  | 3,581
Commercial Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance |  | 8,163 | [1] |  | 4,802 |
Provision/(reversal) for possible credit losses |  | (3,775) |  |  | (3,650) |
Ending Balance |  | 4,388 |  |  | 4,388 |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | (31,466) |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 3,236 |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 37,276 |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 8,038 |
Real Estate Construction Portfolio Segment [Member] |  |  |  |  |  |
Beginning Balance |  | 6,992 | [1] | 23,222 | 30,854 | 19,474
Provision/(reversal) for possible credit losses |  | (873) |  | 3,478 | (428) | 7,226
Charge-offs |  | 0 |  | 0 | 0 | 0
Recoveries |  | 0 |  | 0 | 0 | 0
Net (charge-offs)/recoveries |  | 0 |  | 0 | 0 | 0
Ending Balance |  | 6,119 |  | 26,700 | 6,119 | 26,700
Recoveries |  | 0 |  | 0 | (0) | 0
Reserve for impaired loans |  |  |  | 0 |  | 0
Reserve for non-impaired loans |  |  |  | 26,700 |  | 26,700
Reserve for off-balance sheet credit commitments |  |  |  | 666 |  | 666
Real Estate Construction Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance |  | 2,251 | [1] |  | 690 |
Provision/(reversal) for possible credit losses |  | 1,330 |  |  | (244) |
Ending Balance |  | 3,581 |  |  | 3,581 |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | (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] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 3,135 |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 6,547 |
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 3,825 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Beginning Balance |  | 65,347 | [1] | 39,886 | 49,205 | 33,602
Provision/(reversal) for possible credit losses |  | (7,416) |  | 1,151 | (26,362) | 7,280
Charge-offs |  | 0 |  | 0 | 0 | 0
Recoveries |  | (95) |  | (95) | (190) | (250)
Net (charge-offs)/recoveries |  | 95 |  | 95 | 190 | 250
Ending Balance |  | 58,026 |  | 41,132 | 58,026 | 41,132
Recoveries |  | 95 |  | 95 | 190 | 250
Reserve for impaired loans |  |  |  | 323 |  | 323
Reserve for non-impaired loans |  |  |  | 40,809 |  | 40,809
Reserve for off-balance sheet credit commitments |  |  |  | 117 |  | 117
Commercial Real Estate Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance |  | 36 | [1] |  | 101 |
Provision/(reversal) for possible credit losses |  | 45 |  |  | 46 |
Ending Balance |  | 81 |  |  | 81 |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 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] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | (66) |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 84,198 |
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 35 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |  |
Beginning Balance |  | 30,734 | [1] | 17,366 | 17,737 | 13,108
Provision/(reversal) for possible credit losses |  | (3,899) |  | 2,158 | (10,128) | 6,409
Charge-offs |  | 0 |  | 0 | 0 | 0
Recoveries |  | (208) |  | (68) | (223) | (75)
Net (charge-offs)/recoveries |  | 208 |  | 68 | 223 | 75
Ending Balance |  | 27,043 |  | 19,592 | 27,043 | 19,592
Recoveries |  | 208 |  | 68 | 223 | 75
Reserve for impaired loans |  |  |  | 307 |  | 307
Reserve for non-impaired loans |  |  |  | 19,285 |  | 19,285
Reserve for off-balance sheet credit commitments |  |  |  | 297 |  | 297
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance |  | 0 | [1] |  | 284 |
Provision/(reversal) for possible credit losses |  | 0 |  |  | 0 |
Ending Balance |  | 0 |  |  | 0 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 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] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | (284) |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 36,948 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 0 |
Installment and Other Loans [Member ] |  |  |  |  |  |
Beginning Balance |  | 3 | [1] | 0 | 0 | 19
Provision/(reversal) for possible credit losses |  | (2) |  | 0 | (8) | (19)
Charge-offs |  | 0 |  | 0 | 0 | 0
Recoveries |  | 0 |  | 0 | 0 | 0
Net (charge-offs)/recoveries |  | 0 |  | 0 | 0 | 0
Ending 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 |  |  |  | $ 2 |  | $ 2
Installment and Other Loans [Member ] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance |  | 0 | [1] |  | 3 |
Provision/(reversal) for possible credit losses |  | 0 |  |  | 0 |
Ending Balance |  | $ 0 |  |  | 0 |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 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 | [1] |  |  |  | (3) |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | 9 |
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member] |  |  |  |  |  |
Beginning Balance | [1] |  |  |  | $ 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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