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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

X

- 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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X

- 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

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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

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