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Note 6 - Loans Acquired - Age Analysis of Past Due Acquired Loans, Excluding Loans Covered by Loss Share (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Loans	$ 10,780,000,000	$ 5,630,000,000
Acquired Loans [Member]
Past Due	47,684,000	37,940,000
Current	5,026,392,000	1,267,743,000
Loans	5,074,076,000	1,305,683,000
90 Days Past Due & Accruing	3,145,000	11,000
Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	35,988,000	12,668,000
Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	11,696,000	25,272,000
Consumer Portfolio Segment [Member]
Loans	465,516,000	488,563,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans	280,094,000	303,972,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Past Due	1,149,000	760,000
Current	50,318,000	48,917,000
Loans	51,467,000	49,677,000
90 Days Past Due & Accruing	108,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	889,000	571,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	260,000	189,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Past Due	1,149,000	760,000
Current	50,318,000	48,917,000
Loans	51,467,000	49,677,000
90 Days Past Due & Accruing	108,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	889,000	571,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	260,000	189,000
Commercial Real Estate Portfolio Segment [Member]
Loans	4,239,612,000	3,028,079,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans	614,155,000	336,759,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans	1,094,633,000	904,245,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Past Due	43,086,000	34,256,000
Current	3,774,951,000	1,136,615,000
Loans	3,818,037,000	1,170,871,000
90 Days Past Due & Accruing	2,970,000	11,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	32,689,000	11,326,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	10,397,000	22,930,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Past Due	22,823,000	13,577,000
Current	2,364,954,000	676,531,000
Loans	2,387,777,000	690,108,000
90 Days Past Due & Accruing	2,565,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	17,176,000	2,836,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	5,647,000	10,741,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member]
Past Due	4,025,000	7,464,000
Current	633,007,000	50,123,000
Loans	637,032,000	57,587,000
90 Days Past Due & Accruing	279,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	2,577,000	132,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	1,448,000	7,332,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member]
Past Due	16,238,000	13,215,000
Current	776,990,000	409,961,000
Loans	793,228,000	423,176,000
90 Days Past Due & Accruing	126,000	11,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	12,936,000	8,358,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	3,302,000	4,857,000
Commercial Portfolio Segment [Member]
Loans	973,519,000	789,903,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans	825,217,000	639,525,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans	148,302,000	150,378,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Past Due	3,434,000	2,924,000
Current	1,058,729,000	82,211,000
Loans	1,062,163,000	85,135,000
90 Days Past Due & Accruing	67,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	2,395,000	771,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	1,039,000	2,153,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member]
Past Due	3,383,000	2,876,000
Current	992,204,000	78,961,000
Loans	995,587,000	81,837,000
90 Days Past Due & Accruing	67,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	2,344,000	723,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	1,039,000	2,153,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member]
Past Due	51,000	48,000
Current	66,525,000	3,250,000
Loans	66,576,000	3,298,000
90 Days Past Due & Accruing
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	51,000	48,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due
Unallocated Financing Receivables [Member]
Loans	26,962,000	$ 20,662,000
Unallocated Financing Receivables [Member] | Acquired Loans [Member]
Past Due	15,000
Current	142,394,000
Loans	142,409,000
90 Days Past Due & Accruing
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Past Due	15,000
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due

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
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&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=84173941&loc=SL6953401-111524

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+ 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=84173941&loc=SL6953401-111524

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+ 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

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