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Note 5 - Loans and Allowance for Loan Losses - Recorded Investment in Loans, Excluding Loans Acquired (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Balance, end of period | $ 10,779,685 | $ 5,632,890
Commercial Portfolio Segment [Member] |  |
Balance, end of period | 973,519 | 789,903
Commercial Real Estate Portfolio Segment [Member] |  |
Balance, end of period | 4,239,612 | 3,028,079
Consumer Portfolio Segment [Member] |  |
Balance, end of period | 465,516 | 488,563
Unallocated Financing Receivables [Member] |  |
Balance, end of period | 26,962 | 20,662
Loans, Excluding Acquired Loans [Member] |  |
Loans individually evaluated for impairment | 43,923 | 43,696
Loans collectively evaluated for impairment | 5,661,686 | 4,283,511
Balance, end of period | 5,705,609 | 4,327,207
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment | 7,610 | 11,522
Loans collectively evaluated for impairment | 965,909 | 778,381
Balance, end of period | 973,519 | 789,903
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans individually evaluated for impairment | 31,538 | 30,001
Loans collectively evaluated for impairment | 4,208,074 | 2,998,078
Balance, end of period | 4,239,612 | 3,028,079
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member] |  |
Loans individually evaluated for impairment | 170 | 373
Loans collectively evaluated for impairment | 185,252 | 184,218
Balance, end of period | 185,422 | 184,591
Loans, Excluding Acquired Loans [Member] | Unallocated Financing Receivables [Member] |  |
Loans individually evaluated for impairment | 4,605 | 1,800
Loans collectively evaluated for impairment | 302,451 | 322,834
Balance, end of period | $ 307,056 | $ 324,634

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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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