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Note 3 - Recent Accounting Pronouncements - Cumulative Effect of Changes (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | [1] | Jan. 01, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | --- | ---
Allowance for credit losses on loans |  | $ 131,256 |  |  | $ 166,538 |  |  |
Deferred tax assets |  |  |  |  | 85,610 |  |  |
Allowance for unfunded commitments |  |  |  |  | 5,880 |  |  |
Stockholders' equity |  | $ 2,452,357 | $ 2,460,948 |  | $ 2,418,144 | $ 2,342,448 | $ 2,313,037 | $ 2,294,283
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |
Allowance for credit losses on loans | [2] |  |  | $ (1,560) |  |  |  |
Deferred tax assets | [2] |  |  | 1,319 |  |  |  |
Allowance for unfunded commitments | [2] |  |  | 6,018 |  |  |  |
Stockholders' equity | [2] |  |  | (3,140) |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |  |  |
Allowance for credit losses on loans | [2] |  |  | 164,978 |  |  |  |
Deferred tax assets | [2] |  |  | 86,929 |  |  |  |
Allowance for unfunded commitments | [2] |  |  | 11,898 |  |  |  |
Stockholders' equity | [2] |  |  | $ 2,415,004 |  |  |  |
[1] | Balance sheet amounts previously reported for the impact of the initial adoption of CECL on January 1, 2021 have been corrected. The correction had an after-tax decrease to the cumulative effect of the change in accounting principle related to ASC326 of $2.3 million.
[2] | Balance sheet amounts previously reported for the impact of the initial adoption of CECL have been corrected. The correction decreased the allowance for loan losses by $2.2 million, increased the deferred tax asset by $1.0 million, increased the allowance for unfunded credit commitments by $5.5 million and had an after-tax decrease to opening retained earnings of $2.3 million.

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: 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=123577603&loc=SL6953423-111524 + Details
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