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Note 4 - Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable, Gross	$ 5,630,000,000	$ 4,920,000,000
Loans, Excluding Acquired Loans [Member]
Past Due	40,313,000	26,646,000
Current	4,286,894,000	3,219,808,000
Loans and Leases Receivable, Gross	4,327,207,000	3,246,454,000
90 Days Past Due & Accruing	300,000	1,191,000
Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	18,605,000	13,391,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	21,708,000	13,255,000
Consumer Portfolio Segment [Member]
Loans and Leases Receivable, Gross	488,563,000	385,668,000
Consumer Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	5,804,000	3,645,000
Current	482,759,000	382,023,000
Loans and Leases Receivable, Gross	488,563,000	385,668,000
90 Days Past Due & Accruing	286,000	641,000
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	4,502,000	2,518,000
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	1,302,000	1,127,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans and Leases Receivable, Gross	184,591,000	177,288,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	991,000	1,118,000
Current	183,600,000	176,170,000
Loans and Leases Receivable, Gross	184,591,000	177,288,000
90 Days Past Due & Accruing	275,000	267,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	716,000	639,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	275,000	479,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans and Leases Receivable, Gross	303,972,000	208,380,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	4,813,000	2,527,000
Current	299,159,000	205,853,000
Loans and Leases Receivable, Gross	303,972,000	208,380,000
90 Days Past Due & Accruing	11,000	374,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	3,786,000	1,879,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	1,027,000	648,000
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable, Gross	3,028,079,000	2,204,992,000
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	25,837,000	18,208,000
Current	3,002,242,000	2,186,784,000
Loans and Leases Receivable, Gross	3,028,079,000	2,204,992,000
90 Days Past Due & Accruing	14,000	389,000
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	11,942,000	7,053,000
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	13,895,000	11,155,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans and Leases Receivable, Gross	336,759,000	279,740,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	2,666,000	5,839,000
Current	334,093,000	273,901,000
Loans and Leases Receivable, Gross	336,759,000	279,740,000
90 Days Past Due & Accruing
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	1,420,000	1,328,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	1,246,000	4,511,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans and Leases Receivable, Gross	904,245,000	696,180,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	12,237,000	8,198,000
Current	892,008,000	687,982,000
Loans and Leases Receivable, Gross	904,245,000	696,180,000
90 Days Past Due & Accruing	14,000	364,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	6,310,000	4,856,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	5,927,000	3,342,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans and Leases Receivable, Gross	1,787,075,000	1,229,072,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	10,934,000	4,171,000
Current	1,776,141,000	1,224,901,000
Loans and Leases Receivable, Gross	1,787,075,000	1,229,072,000
90 Days Past Due & Accruing		25,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	4,212,000	869,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	6,722,000	3,302,000
Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Gross	789,903,000	648,679,000
Commercial Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	8,672,000	4,592,000
Current	781,231,000	644,087,000
Loans and Leases Receivable, Gross	789,903,000	648,679,000
90 Days Past Due & Accruing		146,000
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	2,161,000	3,712,000
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	6,511,000	880,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans and Leases Receivable, Gross	639,525,000	500,116,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	7,336,000	4,064,000
Current	632,189,000	496,052,000
Loans and Leases Receivable, Gross	639,525,000	500,116,000
90 Days Past Due & Accruing		90,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	2,040,000	3,427,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	5,296,000	637,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans and Leases Receivable, Gross	150,378,000	148,563,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	1,336,000	528,000
Current	149,042,000	148,035,000
Loans and Leases Receivable, Gross	150,378,000	148,563,000
90 Days Past Due & Accruing		56,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	121,000	285,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due	1,215,000	243,000
Unallocated Financing Receivables [Member]
Loans and Leases Receivable, Gross	20,662,000	7,115,000
Unallocated Financing Receivables [Member] | Loans, Excluding Acquired Loans [Member]
Past Due		201,000
Current	20,662,000	6,914,000
Loans and Leases Receivable, Gross	20,662,000	7,115,000
90 Days Past Due & Accruing		15,000
Unallocated Financing Receivables [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due		108,000
Unallocated Financing Receivables [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Acquired Loans [Member]
Past Due		$ 93,000

X

- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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- Definition

Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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

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