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Note 2 - Acquisitions (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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