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Note 2 - Acquisitions (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
(In thousands)   Acquired from
OKSB
  Fair Value
Adjustments
  Fair
Value
             
Assets Acquired                        
Cash and due from banks   $
79,517
    $
--
    $
79,517
 
Investment securities    
485,468
     
(1,295
)    
484,173
 
Loans acquired    
2,039,524
     
(43,071
)    
1,996,453
 
Allowance for loan losses    
(26,957
)    
26,957
     
--
 
Foreclosed assets    
6,284
     
(1,127
)    
5,157
 
Premises and equipment    
21,210
     
5,457
     
26,667
 
Bank owned life insurance    
28,704
     
--
     
28,704
 
Goodwill    
13,545
     
(13,545
)    
--
 
Core deposit intangible    
1,933
     
40,191
     
42,124
 
Other intangibles    
3,806
     
--
     
3,806
 
Other assets    
33,455
     
(8,929
)    
24,526
 
Total assets acquired   $
2,686,489
    $
4,638
    $
2,691,127
 
                         
Liabilities Assumed                        
Deposits:                        
Non-interest bearing transaction accounts   $
485,971
    $
--
    $
485,971
 
Interest bearing transaction accounts and savings deposits    
869,252
     
--
     
869,252
 
Time deposits    
613,345
     
(2,213
)    
611,132
 
Total deposits    
1,968,568
     
(2,213
)    
1,966,355
 
Securities sold under agreement to repurchase    
11,256
     
--
     
11,256
 
Other borrowings    
347,000
     
--
     
347,000
 
Subordinated debentures    
46,393
     
--
     
46,393
 
Accrued interest and other liabilities    
17,440
     
5,364
     
22,804
 
Total liabilities assumed    
2,390,657
     
3,151
     
2,393,808
 
Equity    
295,832
     
(295,832
)    
--
 
Total equity assumed    
295,832
     
(295,832
)    
--
 
Total liabilities and equity assumed   $
2,686,489
    $
(292,681
)   $
2,393,808
 
Net assets acquired    
 
     
 
     
297,319
 
Purchase price    
 
     
 
     
526,251
 
Goodwill    
 
     
 
    $
228,932
 
(In thousands)   Acquired from
First Texas
  Fair Value
Adjustments
  Fair
Value
             
Assets Acquired                        
Cash and due from banks   $
59,277
    $
--
    $
59,277
 
Investment securities    
81,114
     
(596
)    
80,518
 
Loans acquired    
2,246,212
     
(37,834
)    
2,208,378
 
Allowance for loan losses    
(20,864
)    
20,664
     
(200
)
Premises and equipment    
24,864
     
10,123
     
34,987
 
Bank owned life insurance    
7,190
     
--
     
7,190
 
Goodwill    
37,227
     
(37,227
)    
--
 
Core deposit intangible    
--
     
7,328
     
7,328
 
Other assets    
18,263
     
12,703
     
30,966
 
Total assets acquired   $
2,453,283
    $
(24,839
)   $
2,428,444
 
                         
Liabilities Assumed                        
Deposits:                        
Non-interest bearing transaction accounts   $
74,410
    $
--
    $
74,410
 
Interest bearing transaction accounts and savings deposits    
1,683,298
     
--
     
1,683,298
 
Time deposits    
124,233
     
(283
)    
123,950
 
Total deposits    
1,881,941
     
(283
)    
1,881,658
 
Securities sold under agreement to repurchase    
50,000
     
--
     
50,000
 
Other borrowings    
235,000
     
--
     
235,000
 
Subordinated debentures    
30,323
     
(811
)    
29,512
 
Accrued interest and other liabilities    
11,727
     
1,463
     
13,190
 
Total liabilities assumed    
2,208,991
     
369
     
2,209,360
 
Equity    
244,292
     
(244,292
)    
--
 
Total equity assumed    
244,292
     
(244,292
)    
--
 
Total liabilities and equity assumed   $
2,453,283
    $
(243,923
)   $
2,209,360
 
Net assets acquired    
 
     
 
     
219,084
 
Purchase price    
 
     
 
     
457,103
 
Goodwill    
 
     
 
    $
238,019
 
(In thousands)   Acquired from
Hardeman
  Fair Value
Adjustments
  Fair
Value
             
Assets Acquired                        
Cash and due from banks   $
8,001
    $
--
    $
8,001
 
Interest bearing balances due from banks - time    
1,984
     
--
     
1,984
 
Investment securities    
170,654
     
(285
)    
170,369
 
Loans acquired    
257,641
     
(5,992
)    
251,649
 
Allowance for loan losses    
(2,382
)    
2,382
     
--
 
Foreclosed assets    
1,083
     
(452
)    
631
 
Premises and equipment    
9,905
     
1,258
     
11,163
 
Bank owned life insurance    
7,819
     
--
     
7,819
 
Goodwill    
11,485
     
(11,485
)    
--
 
Core deposit intangible    
--
     
7,840
     
7,840
 
Other intangibles    
--
     
830
     
830
 
Other assets    
2,639
     
(1
)    
2,638
 
Total assets acquired   $
468,829
    $
(5,905
)   $
462,924
 
                         
Liabilities Assumed                        
Deposits:                        
Non-interest bearing transaction accounts   $
76,555
    $
--
    $
76,555
 
Interest bearing transaction accounts and savings deposits    
214,872
     
--
     
214,872
 
Time deposits    
97,917
     
(368
)    
97,549
 
Total deposits    
389,344
     
(368
)    
388,976
 
Securities sold under agreement to repurchase    
17,163
     
--
     
17,163
 
Other borrowings    
3,000
     
--
     
3,000
 
Subordinated debentures    
6,702
     
--
     
6,702
 
Accrued interest and other liabilities    
1,891
     
1,924
     
3,815
 
Total liabilities assumed    
418,100
     
1,556
     
419,656
 
Equity    
50,729
     
(50,729
)    
--
 
Total equity assumed    
50,729
     
(50,729
)    
--
 
Total liabilities and equity assumed   $
468,829
    $
(49,173
)   $
419,656
 
Net assets acquired    
 
     
 
     
43,268
 
Purchase price    
 
     
 
     
72,639
 
Goodwill    
 
     
 
    $
29,371
 
(In thousands)   Acquired from
Citizens
  Fair Value
Adjustments
  Fair
Value
             
Assets Acquired                        
Cash and due from banks   $
131,467
    $
(351
)   $
131,116
 
Federal funds sold    
10,000
     
--
     
10,000
 
Investment securities    
61,987
     
1
     
61,988
 
Loans acquired    
350,361
     
(9,511
)    
340,850
 
Allowance for loan losses    
(4,313
)    
4,313
     
--
 
Foreclosed assets    
4,960
     
(1,518
)    
3,442
 
Premises and equipment    
6,746
     
1,339
     
8,085
 
Bank owned life insurance    
6,632
     
--
     
6,632
 
Core deposit intangible    
--
     
5,075
     
5,075
 
Other intangibles    
--
     
591
     
591
 
Other assets    
17,364
     
6
     
17,370
 
Total assets acquired   $
585,204
    $
(55
)   $
585,149
 
                         
Liabilities Assumed                        
Deposits:                        
Non-interest bearing transaction accounts   $
109,281
    $
--
    $
109,281
 
Interest bearing transaction accounts and savings deposits    
204,912
     
--
     
204,912
 
Time deposits    
195,664
     
--
     
195,664
 
Total deposits    
509,857
     
--
     
509,857
 
Securities sold under agreement to repurchase    
13,233
     
--
     
13,233
 
FHLB borrowings    
4,000
     
47
     
4,047
 
Accrued interest and other liabilities    
3,558
     
1,530
     
5,088
 
Total liabilities assumed    
530,648
     
1,577
     
532,225
 
Equity    
54,556
     
(54,556
)    
--
 
Total equity assumed    
54,556
     
(54,556
)    
--
 
Total liabilities and equity assumed   $
585,204
    $
(52,979
)   $
532,225
 
Net assets acquired    
 
     
 
     
52,924
 
Purchase price    
 
     
 
     
76,300
 
Goodwill    
 
     
 
    $
23,376
 
(In thousands)   Acquired from
Liberty
  Fair Value
Adjustments
  Fair
Value
             
Assets Acquired                        
Cash and due from banks, including time deposits   $
102,637
    $
(14
)   $
102,623
 
Federal funds sold    
7,060
     
--
     
7,060
 
Investment securities    
99,123
     
(335
)    
98,788
 
Loans acquired, not covered by FDIC loss share    
790,493
     
(9,835
)    
780,658
 
Allowance for loan losses    
(10,422
)    
10,422
     
--
 
Premises and equipment    
34,239
     
(3,215
)    
31,024
 
Bank owned life insurance    
16,972
     
--
     
16,972
 
Core deposit intangible    
699
     
13,857
     
14,556
 
Other intangibles    
3,063
     
(3,063
)    
--
 
Other assets    
17,703
     
(3,112
)    
14,591
 
Total assets acquired   $
1,061,567
    $
4,705
    $
1,066,272
 
                         
Liabilities Assumed                        
Deposits:                        
Non-interest bearing transaction accounts   $
146,618
    $
--
    $
146,618
 
Interest bearing transaction accounts and savings deposits    
543,183
     
--
     
543,183
 
Time deposits    
184,913
     
--
     
184,913
 
Total deposits    
874,714
     
--
     
874,714
 
FHLB borrowings    
46,128
     
223
     
46,351
 
Subordinated debentures    
20,620
     
(510
)    
20,110
 
Accrued interest and other liabilities    
7,828
     
300
     
8,128
 
Total liabilities assumed    
949,290
     
13
     
949,303
 
Equity    
112,277
     
(112,277
)    
--
 
Total equity assumed    
112,277
     
(112,277
)    
--
 
Total liabilities and equity assumed   $
1,061,567
    $
(112,264
)   $
949,303
 
Net assets acquired    
 
     
 
     
116,969
 
Purchase price    
 
     
 
     
212,176
 
Goodwill    
 
     
 
    $
95,207
 
(In thousands)   Acquired from
Community First
  Fair Value
Adjustments
  Fair
Value
             
Assets Acquired                        
Cash and due from banks   $
39,848
    $
--
    $
39,848
 
Federal funds sold    
76,508
     
--
     
76,508
 
Investment securities    
570,199
     
(3,381
)    
566,818
 
Loans acquired, not covered by FDIC loss share    
1,163,398
     
(26,855
)    
1,136,543
 
Allowance for loan losses    
(14,635
)    
14,635
     
--
 
Foreclosed assets not covered by FDIC loss share    
747
     
--
     
747
 
Premises and equipment    
44,837
     
(2,794
)    
42,043
 
Bank owned life insurance    
22,149
     
--
     
22,149
 
Goodwill    
100
     
(100
)    
--
 
Core deposit intangible    
--
     
11,273
     
11,273
 
Other intangibles    
--
     
420
     
420
 
Deferred tax asset    
3,700
     
3,538
     
7,238
 
Other assets    
11,474
     
--
     
11,474
 
Total assets acquired   $
1,918,325
    $
(3,264
)   $
1,915,061
 
                         
Liabilities Assumed                        
Deposits:                        
Non-interest bearing transaction accounts   $
103,825
    $
--
    $
103,825
 
Interest bearing transaction accounts and savings deposits    
995,207
     
--
     
995,207
 
Time deposits    
436,181
     
849
     
437,030
 
Total deposits    
1,535,213
     
849
     
1,536,062
 
Federal funds purchased and securities sold under agreement to repurchase    
16,230
     
--
     
16,230
 
FHLB borrowings    
143,047
     
674
     
143,721
 
Subordinated debentures    
21,754
     
(840
)    
20,914
 
Accrued interest and other liabilities    
8,769
     
601
     
9,370
 
Total liabilities assumed    
1,725,013
     
1,284
     
1,726,297
 
Equity    
193,312
     
(193,312
)    
--
 
Total equity assumed    
193,312
     
(193,312
)    
--
 
Total liabilities and equity assumed   $
1,918,325
    $
(192,028
)   $
1,726,297
 
Net assets acquired    
 
     
 
     
188,764
 
Purchase price    
 
     
 
     
299,204
 
Goodwill    
 
     
 
    $
110,440
 
(In thousands)   Acquired from
Ozark Trust
  Fair Value
Adjustments
  Fair
Value
             
Assets Acquired                        
Cash   $
1,756
    $
--
    $
1,756
 
Investment securities    
241
     
--
     
241
 
Premises and equipment    
1,126
     
418
     
1,544
 
Other intangibles    
--
     
9,733
     
9,733
 
Other assets    
752
     
869
     
1,621
 
Total assets acquired   $
3,875
    $
11,020
    $
14,895
 
                         
Liabilities Assumed                        
Deferred tax liability    
63
     
4,175
     
4,238
 
Accrued and other liabilities    
302
     
--
     
302
 
Total liabilities assumed    
365
     
4,175
     
4,540
 
Equity    
3,510
     
(3,510
)    
--
 
Total equity assumed    
3,510
     
(3,510
)    
--
 
Total liabilities and equity assumed   $
3,875
    $
665
    $
4,540
 
Net assets acquired    
 
     
 
     
10,355
 
Purchase price    
 
     
 
     
23,623
 
Goodwill    
 
     
 
    $
13,268
 
Business Acquisition, Pro Forma Information [Table Text Block]
(In thousands, except per share data)   2017   2016
Revenue
(1)
  $
654,358
    $
620,461
 
Net income   $
130,947
    $
136,199
 
Diluted earnings per share   $
1.43
    $
1.52