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Note 17 - Fair Value Measurements - Estimated Fair Values and Related Carrying Amounts of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets: |  |
Held-to-maturity securities | $ 373,298 | $ 465,960
Reported Value Measurement [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 598,042 | 285,659
Interest bearing balances due from banks - time | 3,314 | 4,563
Held-to-maturity securities | 368,058 | 462,096
Mortgage loans held for sale | 24,038 | 27,788
Interest receivable | 43,528 | 27,788
Financial liabilities: |  |
Federal funds purchased and securities sold under agreements to repurchase | 122,444 | 115,029
Other borrowings | 1,380,024 | 273,159
Subordinated debentures | 140,565 | 60,397
Interest payable | 4,564 | 1,668
Reported Value Measurement [Member] | Non-Interest Bearing Transaction Accounts [Member] |  |
Financial liabilities: |  |
Deposits | 2,665,249 | 1,491,676
Reported Value Measurement [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member] |  |
Financial liabilities: |  |
Deposits | 6,494,896 | 3,956,483
Reported Value Measurement [Member] | Time Deposits [Member] |  |
Financial liabilities: |  |
Deposits | 1,932,730 | 1,287,060
Reported Value Measurement [Member] | Legacy Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) | 5,663,941 | 4,290,921
Reported Value Measurement [Member] | Acquired Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) | 5,074,076 | 1,305,683
Estimate of Fair Value Measurement [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 598,042 | 285,659
Interest bearing balances due from banks - time | 3,314 | 4,563
Held-to-maturity securities | 373,298 | 465,960
Mortgage loans held for sale | 24,038 | 27,788
Interest receivable | 43,528 | 27,788
Financial liabilities: |  |
Federal funds purchased and securities sold under agreements to repurchase | 122,444 | 115,029
Other borrowings | 1,381,365 | 292,367
Subordinated debentures | 136,474 | 55,318
Interest payable | 4,564 | 1,668
Estimate of Fair Value Measurement [Member] | Non-Interest Bearing Transaction Accounts [Member] |  |
Financial liabilities: |  |
Deposits | 2,665,249 | 1,491,676
Estimate of Fair Value Measurement [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member] |  |
Financial liabilities: |  |
Deposits | 6,494,896 | 3,956,483
Estimate of Fair Value Measurement [Member] | Time Deposits [Member] |  |
Financial liabilities: |  |
Deposits | 1,915,539 | 1,278,339
Estimate of Fair Value Measurement [Member] | Legacy Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) | 5,646,505 | 4,305,165
Estimate of Fair Value Measurement [Member] | Acquired Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) | 5,058,455 | 1,310,017
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 598,042 | 285,659
Interest bearing balances due from banks - time |  |
Held-to-maturity securities |  |
Mortgage loans held for sale |  |
Interest receivable |  |
Financial liabilities: |  |
Federal funds purchased and securities sold under agreements to repurchase |  |
Other borrowings |  |
Subordinated debentures |  |
Interest payable |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Non-Interest Bearing Transaction Accounts [Member] |  |
Financial liabilities: |  |
Deposits |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member] |  |
Financial liabilities: |  |
Deposits |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Time Deposits [Member] |  |
Financial liabilities: |  |
Deposits |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Legacy Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Acquired Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial assets: |  |
Cash and cash equivalents |  |
Interest bearing balances due from banks - time | 3,314 | 4,563
Held-to-maturity securities | 373,298 | 465,960
Mortgage loans held for sale |  |
Interest receivable | 43,528 | 27,788
Financial liabilities: |  |
Federal funds purchased and securities sold under agreements to repurchase | 122,444 | 115,029
Other borrowings | 1,381,365 | 292,367
Subordinated debentures | 136,474 | 55,318
Interest payable | 4,564 | 1,668
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Non-Interest Bearing Transaction Accounts [Member] |  |
Financial liabilities: |  |
Deposits | 2,665,249 | 1,491,676
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member] |  |
Financial liabilities: |  |
Deposits | 6,494,896 | 3,956,483
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member] |  |
Financial liabilities: |  |
Deposits |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Legacy Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Acquired Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Financial assets: |  |
Cash and cash equivalents |  |
Interest bearing balances due from banks - time |  |
Held-to-maturity securities |  |
Mortgage loans held for sale | 24,038 | 27,788
Interest receivable |  |
Financial liabilities: |  |
Federal funds purchased and securities sold under agreements to repurchase |  |
Other borrowings |  |
Subordinated debentures |  |
Interest payable |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Non-Interest Bearing Transaction Accounts [Member] |  |
Financial liabilities: |  |
Deposits |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Bearing Transaction Accounts and Savings Deposits [Member] |  |
Financial liabilities: |  |
Deposits |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Time Deposits [Member] |  |
Financial liabilities: |  |
Deposits | 1,915,539 | 1,278,339
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Legacy Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) | 5,646,505 | 4,305,165
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Acquired Loans [Member] |  |
Financial assets: |  |
Legacy loans (net of allowance) | $ 5,058,455 | $ 1,310,017

X
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References No definition available. + Details
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- Definition Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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