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Note 4 - Loans and Allowance for Loan Losses - Recorded Investment in Loans, Excluding Loans Acquired (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Balance, end of period | $ 5,632,890 | $ 4,919,355
Commercial Portfolio Segment [Member] |  |
Balance, end of period | 789,903 | 648,679
Commercial Real Estate Portfolio Segment [Member] |  |
Balance, end of period | 3,028,079 | 2,204,992
Consumer Portfolio Segment [Member] |  |
Balance, end of period | 488,563 | 385,668
Unallocated Financing Receivables [Member] |  |
Balance, end of period | 20,662 | 7,115
Loans, Excluding Acquired Loans [Member] |  |
Loans individually evaluated for impairment | 43,696 | 18,190
Loans collectively evaluated for impairment | 4,283,511 | 3,228,264
Balance, end of period | 4,327,207 | 3,246,454
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment | 11,522 | 2,252
Loans collectively evaluated for impairment | 778,381 | 646,427
Balance, end of period | 789,903 | 648,679
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans individually evaluated for impairment | 30,001 | 15,017
Loans collectively evaluated for impairment | 2,998,078 | 2,189,975
Balance, end of period | 3,028,079 | 2,204,992
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member] |  |
Loans individually evaluated for impairment | 373 | 479
Loans collectively evaluated for impairment | 184,218 | 176,809
Balance, end of period | 184,591 | 177,288
Loans, Excluding Acquired Loans [Member] | Unallocated Financing Receivables [Member] |  |
Loans individually evaluated for impairment | 1,800 | 442
Loans collectively evaluated for impairment | 322,834 | 215,053
Balance, end of period | $ 324,634 | $ 215,495

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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=66008989&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=66008989&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=65884687&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=66008989&loc=d3e5074-111524 + Details
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