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Note 6 - Loans Acquired - Summary of Acquired Loans, Excluding Loans Covered by Loss Share (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired loans	$ 10,779,685	$ 5,632,890
Pass [Member]
Acquired loans	10,302,189	5,433,036
Special Mention [Member]
Acquired loans	301,922	33,865
Substandard [Member]
Acquired loans	175,064	164,251
Doubtful [Member]
Acquired loans	376	1,715
Unlikely to be Collected Financing Receivable [Member]
Acquired loans	134	23
Acquired Loans [Member]
Acquired loans	5,074,076	1,305,683
Acquired Loans [Member] | Pass [Member]
Acquired loans	4,782,384	1,217,886
Acquired Loans [Member] | Special Mention [Member]
Acquired loans	198,314	22,181
Acquired Loans [Member] | Substandard [Member]
Acquired loans	93,378	64,075
Acquired Loans [Member] | Doubtful [Member]
Acquired loans		1,541
Acquired Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Consumer Portfolio Segment [Member]
Acquired loans	465,516	488,563
Consumer Portfolio Segment [Member] | Pass [Member]
Acquired loans	460,080	485,575
Consumer Portfolio Segment [Member] | Special Mention [Member]
Acquired loans		26
Consumer Portfolio Segment [Member] | Substandard [Member]
Acquired loans	5,436	2,962
Consumer Portfolio Segment [Member] | Doubtful [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Other Loans [Member]
Acquired loans	280,094	303,972
Consumer Portfolio Segment [Member] | Other Loans [Member] | Pass [Member]
Acquired loans	275,160	301,632
Consumer Portfolio Segment [Member] | Other Loans [Member] | Special Mention [Member]
Acquired loans		26
Consumer Portfolio Segment [Member] | Other Loans [Member] | Substandard [Member]
Acquired loans	4,934	2,314
Consumer Portfolio Segment [Member] | Other Loans [Member] | Doubtful [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Acquired loans		49,677
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Pass [Member]
Acquired loans		48,992
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Special Mention [Member]
Acquired loans		14
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Substandard [Member]
Acquired loans		671
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Doubtful [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Acquired loans	51,467	49,677
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Pass [Member]
Acquired loans	50,625	48,992
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Special Mention [Member]
Acquired loans	21	14
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Substandard [Member]
Acquired loans	821	671
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Doubtful [Member]
Acquired loans
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member]
Acquired loans	4,239,612	3,028,079
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Acquired loans	4,150,321	2,943,890
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Acquired loans	29,330	10,996
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Acquired loans	59,658	73,019
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Acquired loans	303	174
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Acquired loans	614,155	336,759
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Acquired loans	603,126	330,080
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Acquired loans	5,795	98
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Acquired loans	5,218	6,565
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Acquired loans	16	16
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Acquired loans	1,094,633	904,245
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Pass [Member]
Acquired loans	1,066,902	875,603
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Special Mention [Member]
Acquired loans	3,954	4,024
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Substandard [Member]
Acquired loans	23,490	24,460
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Doubtful [Member]
Acquired loans	287	158
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Acquired loans	3,818,037	1,170,871
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Pass [Member]
Acquired loans	3,576,661	1,092,275
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Special Mention [Member]
Acquired loans	184,392	20,168
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Substandard [Member]
Acquired loans	56,984	56,893
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Doubtful [Member]
Acquired loans		1,535
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member]
Acquired loans	2,387,777	690,108
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Pass [Member]
Acquired loans	2,337,097	641,018
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Special Mention [Member]
Acquired loans	15,064	17,384
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Substandard [Member]
Acquired loans	35,616	31,706
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Doubtful [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member]
Acquired loans	637,032	57,587
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Pass [Member]
Acquired loans	468,610	50,704
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Special Mention [Member]
Acquired loans	166,710	88
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Substandard [Member]
Acquired loans	1,712	6,795
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Doubtful [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member]
Acquired loans	793,228	423,176
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Pass [Member]
Acquired loans	770,954	400,553
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Special Mention [Member]
Acquired loans	2,618	2,696
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Substandard [Member]
Acquired loans	19,656	18,392
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Doubtful [Member]
Acquired loans		1,535
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Portfolio Segment [Member]
Acquired loans	973,519	789,903
Commercial Portfolio Segment [Member] | Pass [Member]
Acquired loans	882,442	765,023
Commercial Portfolio Segment [Member] | Special Mention [Member]
Acquired loans	74,278	662
Commercial Portfolio Segment [Member] | Substandard [Member]
Acquired loans	16,592	24,195
Commercial Portfolio Segment [Member] | Doubtful [Member]
Acquired loans	73
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans	134	23
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Acquired loans	825,217	639,525
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member]
Acquired loans	736,377	616,805
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Special Mention [Member]
Acquired loans	74,254	558
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member]
Acquired loans	14,402	22,162
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Doubtful [Member]
Acquired loans	50
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans	134
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Acquired loans	148,302	150,378
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Pass [Member]
Acquired loans	146,065	148,218
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Special Mention [Member]
Acquired loans	24	104
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Substandard [Member]
Acquired loans	2,190	2,033
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Doubtful [Member]
Acquired loans	23
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans		23
Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Acquired loans	1,062,163	85,135
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Pass [Member]
Acquired loans	1,012,689	76,619
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Special Mention [Member]
Acquired loans	13,901	1,999
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Substandard [Member]
Acquired loans	35,573	6,511
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Doubtful [Member]
Acquired loans		6
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member]
Acquired loans	995,587	81,837
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Pass [Member]
Acquired loans	946,322	73,609
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Special Mention [Member]
Acquired loans	13,901	1,965
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Substandard [Member]
Acquired loans	35,364	6,257
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Doubtful [Member]
Acquired loans		6
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member]
Acquired loans	66,576	3,298
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Pass [Member]
Acquired loans	66,367	3,010
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Special Mention [Member]
Acquired loans		34
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Substandard [Member]
Acquired loans	209	254
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Doubtful [Member]
Acquired loans
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Unallocated Financing Receivables [Member]
Acquired loans	26,962	20,662
Unallocated Financing Receivables [Member] | Pass [Member]
Acquired loans	26,962	20,662
Unallocated Financing Receivables [Member] | Special Mention [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Substandard [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Doubtful [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Acquired Loans [Member]
Acquired loans	142,409
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Pass [Member]
Acquired loans	142,409
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Special Mention [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Substandard [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Doubtful [Member]
Acquired loans
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Acquired loans

X

- 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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