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Note 2 - Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
Oct. 19, 2017
May 15, 2017
Sep. 09, 2016
Oct. 29, 2015
Feb. 27, 2015
Dec. 31, 2017
Dec. 31, 2016
Goodwill           $ 842,651,000 $ 348,505,000
Goodwill           $ 842,651,000 $ 348,505,000
OKSB Merger [Member]              
Cash and due from banks $ 79,517,000            
Investment securities 484,173,000            
Loans acquired 1,996,453,000            
Allowance for loan losses            
Foreclosed assets 5,157,000            
Premises and equipment 26,667,000            
Bank owned life insurance 28,704,000            
Goodwill 228,932,000            
Other assets 24,526,000            
Total assets acquired 2,691,127,000            
Non-interest bearing transaction accounts 485,971,000            
Interest bearing transaction accounts and savings deposits 869,252,000            
Time deposits 611,132,000            
Total deposits 1,966,355,000            
Securities sold under agreement to repurchase 11,256,000            
Other borrowings 347,000,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures 46,393,000            
Accrued interest and other liabilities 22,804,000            
Total liabilities assumed 2,393,808,000            
Equity            
Total liabilities and equity assumed 2,393,808,000            
Net assets acquired 297,319,000            
Purchase price 526,251,000            
Goodwill 228,932,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share 2,000,000,000            
OKSB Merger [Member] | Core Deposit Premium [Member]              
Intangibles 42,124,000            
OKSB Merger [Member] | Other Intangible Assets [Member]              
Intangibles 3,806,000            
OKSB Merger [Member] | Cost Acquired [Member]              
Cash and due from banks 79,517,000            
Investment securities 485,468,000            
Loans acquired 2,039,524,000            
Allowance for loan losses (26,957,000)            
Foreclosed assets 6,284,000            
Premises and equipment 21,210,000            
Bank owned life insurance 28,704,000            
Goodwill 13,545,000            
Other assets 33,455,000            
Total assets acquired 2,686,489,000            
Non-interest bearing transaction accounts 485,971,000            
Interest bearing transaction accounts and savings deposits 869,252,000            
Time deposits 613,345,000            
Total deposits 1,968,568,000            
Securities sold under agreement to repurchase 11,256,000            
Other borrowings 347,000,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures 46,393,000            
Accrued interest and other liabilities 17,440,000            
Total liabilities assumed 2,390,657,000            
Equity 295,832,000            
Total liabilities and equity assumed 2,686,489,000            
Goodwill 13,545,000            
OKSB Merger [Member] | Cost Acquired [Member] | Core Deposit Premium [Member]              
Intangibles 1,933,000            
OKSB Merger [Member] | Cost Acquired [Member] | Other Intangible Assets [Member]              
Intangibles 3,806,000            
OKSB Merger [Member] | Fair Value Adjustments [Member]              
Cash and due from banks            
Investment securities (1,295,000)            
Loans acquired (43,071,000)            
Allowance for loan losses 26,957,000            
Foreclosed assets (1,127,000)            
Premises and equipment 5,457,000            
Bank owned life insurance            
Goodwill (13,545,000)            
Other assets (8,929,000)            
Total assets acquired 4,638,000            
Non-interest bearing transaction accounts            
Interest bearing transaction accounts and savings deposits            
Time deposits (2,213,000)            
Total deposits (2,213,000)            
Securities sold under agreement to repurchase            
Other borrowings            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures            
Accrued interest and other liabilities 5,364,000            
Total liabilities assumed 3,151,000            
Equity (295,832,000)            
Total liabilities and equity assumed (292,681,000)            
Goodwill (13,545,000)            
OKSB Merger [Member] | Fair Value Adjustments [Member] | Core Deposit Premium [Member]              
Intangibles 40,191,000            
OKSB Merger [Member] | Fair Value Adjustments [Member] | Other Intangible Assets [Member]              
Intangibles            
First Texas Merger [Member]              
Cash and due from banks 59,277,000            
Investment securities 80,518,000            
Loans acquired 2,208,378,000            
Allowance for loan losses (200,000)            
Premises and equipment 34,987,000            
Bank owned life insurance 7,190,000            
Goodwill 238,019,000            
Other assets 30,966,000            
Total assets acquired 2,428,444,000            
Non-interest bearing transaction accounts 74,410,000            
Interest bearing transaction accounts and savings deposits 1,683,298,000            
Time deposits 123,950,000            
Total deposits 1,881,658,000            
Securities sold under agreement to repurchase 50,000,000            
Other borrowings 235,000,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures 29,512,000            
Accrued interest and other liabilities 13,190,000            
Total liabilities assumed 2,209,360,000            
Equity            
Total liabilities and equity assumed 2,209,360,000            
Net assets acquired 219,084,000            
Purchase price 457,103,000            
Goodwill 238,019,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share 2,200,000,000            
First Texas Merger [Member] | Core Deposit Premium [Member]              
Intangibles 7,328,000            
First Texas Merger [Member] | Cost Acquired [Member]              
Cash and due from banks 59,277,000            
Investment securities 81,114,000            
Loans acquired 2,246,212,000            
Allowance for loan losses (20,864,000)            
Premises and equipment 24,864,000            
Bank owned life insurance 7,190,000            
Goodwill 37,227,000            
Other assets 18,263,000            
Total assets acquired 2,453,283,000            
Non-interest bearing transaction accounts 74,410,000            
Interest bearing transaction accounts and savings deposits 1,683,298,000            
Time deposits 124,233,000            
Total deposits 1,881,941,000            
Securities sold under agreement to repurchase 50,000,000            
Other borrowings 235,000,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures 30,323,000            
Accrued interest and other liabilities 11,727,000            
Total liabilities assumed 2,208,991,000            
Equity 244,292,000            
Total liabilities and equity assumed 2,453,283,000            
Goodwill 37,227,000            
First Texas Merger [Member] | Cost Acquired [Member] | Core Deposit Premium [Member]              
Intangibles            
First Texas Merger [Member] | Fair Value Adjustments [Member]              
Cash and due from banks            
Investment securities (596,000)            
Loans acquired (37,834,000)            
Allowance for loan losses 20,664,000            
Premises and equipment 10,123,000            
Bank owned life insurance            
Goodwill (37,227,000)            
Other assets 12,703,000            
Total assets acquired (24,839,000)            
Non-interest bearing transaction accounts            
Interest bearing transaction accounts and savings deposits            
Time deposits (283,000)            
Total deposits (283,000)            
Securities sold under agreement to repurchase            
Other borrowings            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures (811,000)            
Accrued interest and other liabilities 1,463,000            
Total liabilities assumed 369,000            
Equity (244,292,000)            
Total liabilities and equity assumed (243,923,000)            
Goodwill (37,227,000)            
First Texas Merger [Member] | Fair Value Adjustments [Member] | Core Deposit Premium [Member]              
Intangibles $ 7,328,000            
Hardeman County Investment Company, Inc. [Member]              
Cash and due from banks   $ 8,001,000          
Investment securities   170,369,000          
Loans acquired   251,649,000          
Foreclosed assets   631,000          
Premises and equipment   11,163,000          
Bank owned life insurance   7,819,000          
Goodwill   29,371,000          
Other assets   2,638,000          
Total assets acquired   462,924,000          
Non-interest bearing transaction accounts   76,555,000          
Interest bearing transaction accounts and savings deposits   214,872,000          
Time deposits   97,549,000          
Total deposits   388,976,000          
Securities sold under agreement to repurchase   17,163,000          
Other borrowings   3,000,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures   6,702,000          
Accrued interest and other liabilities   3,815,000          
Total liabilities assumed   419,656,000          
Equity            
Total liabilities and equity assumed   419,656,000          
Net assets acquired   43,268,000          
Purchase price   72,639,000          
Goodwill   29,371,000          
Interest bearing balances due from banks - time   1,984,000          
Hardeman County Investment Company, Inc. [Member] | Core Deposit Premium [Member]              
Intangibles   7,840,000          
Hardeman County Investment Company, Inc. [Member] | Other Intangible Assets [Member]              
Intangibles   830,000          
Hardeman County Investment Company, Inc. [Member] | Cost Acquired [Member]              
Cash and due from banks   8,001,000          
Investment securities   170,654,000          
Loans acquired   257,641,000          
Allowance for loan losses   (2,382,000)          
Foreclosed assets   1,083,000          
Premises and equipment   9,905,000          
Bank owned life insurance   7,819,000          
Goodwill   11,485,000          
Other assets   2,639,000          
Total assets acquired   468,829,000          
Non-interest bearing transaction accounts   76,555,000          
Interest bearing transaction accounts and savings deposits   214,872,000          
Time deposits   97,917,000          
Total deposits   389,344,000          
Securities sold under agreement to repurchase   17,163,000          
Other borrowings   3,000,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures   6,702,000          
Accrued interest and other liabilities   1,891,000          
Total liabilities assumed   418,100,000          
Equity   50,729,000          
Total liabilities and equity assumed   468,829,000          
Goodwill   11,485,000          
Interest bearing balances due from banks - time   1,984,000          
Hardeman County Investment Company, Inc. [Member] | Fair Value Adjustments [Member]              
Cash and due from banks            
Investment securities   (285,000)          
Loans acquired   (5,992,000)          
Allowance for loan losses   2,382,000          
Foreclosed assets   (452,000)          
Premises and equipment   1,258,000          
Goodwill   (11,485,000)          
Other assets   (1,000)          
Total assets acquired   (5,905,000)          
Non-interest bearing transaction accounts            
Interest bearing transaction accounts and savings deposits            
Time deposits   (368,000)          
Total deposits   (368,000)          
Securities sold under agreement to repurchase            
Other borrowings            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures            
Accrued interest and other liabilities   1,924,000          
Total liabilities assumed   1,556,000          
Equity   (50,729,000)          
Total liabilities and equity assumed   (49,173,000)          
Goodwill   (11,485,000)          
Interest bearing balances due from banks - time            
Hardeman County Investment Company, Inc. [Member] | Fair Value Adjustments [Member] | Core Deposit Premium [Member]              
Intangibles   7,840,000          
Hardeman County Investment Company, Inc. [Member] | Fair Value Adjustments [Member] | Other Intangible Assets [Member]              
Intangibles   $ 830,000          
Citizens National Bank [Member]              
Cash and due from banks     $ 131,116,000        
Investment securities     61,988,000        
Loans acquired     340,850,000        
Allowance for loan losses            
Foreclosed assets     3,442,000        
Premises and equipment     8,085,000        
Bank owned life insurance     6,632,000        
Goodwill     23,376,000        
Other assets     17,370,000        
Total assets acquired     585,149,000        
Non-interest bearing transaction accounts     109,281,000        
Interest bearing transaction accounts and savings deposits     204,912,000        
Time deposits     195,664,000        
Total deposits     509,857,000        
Securities sold under agreement to repurchase     13,233,000        
Accrued interest and other liabilities     5,088,000        
Total liabilities assumed     532,225,000        
Equity            
Total liabilities and equity assumed     532,225,000        
Net assets acquired     52,924,000        
Purchase price     76,300,000        
Goodwill     23,376,000        
Federal funds sold     10,000,000        
FHLB borrowings     4,047,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share     340,900,000        
Citizens National Bank [Member] | Core Deposit Premium [Member]              
Intangibles     5,075,000        
Citizens National Bank [Member] | Other Intangible Assets [Member]              
Intangibles     591,000        
Citizens National Bank [Member] | Cost Acquired [Member]              
Cash and due from banks     131,467,000        
Investment securities     61,987,000        
Loans acquired     350,361,000        
Allowance for loan losses     (4,313,000)        
Foreclosed assets     4,960,000        
Premises and equipment     6,746,000        
Bank owned life insurance     6,632,000        
Other assets     17,364,000        
Total assets acquired     585,204,000        
Non-interest bearing transaction accounts     109,281,000        
Interest bearing transaction accounts and savings deposits     204,912,000        
Time deposits     195,664,000        
Total deposits     509,857,000        
Securities sold under agreement to repurchase     13,233,000        
Accrued interest and other liabilities     3,558,000        
Total liabilities assumed     530,648,000        
Equity     54,556,000        
Total liabilities and equity assumed     585,204,000        
Federal funds sold     10,000,000        
FHLB borrowings     4,000,000        
Citizens National Bank [Member] | Cost Acquired [Member] | Core Deposit Premium [Member]              
Intangibles            
Citizens National Bank [Member] | Cost Acquired [Member] | Other Intangible Assets [Member]              
Intangibles            
Citizens National Bank [Member] | Fair Value Adjustments [Member]              
Cash and due from banks     (351,000)        
Investment securities     1,000        
Loans acquired     (9,511,000)        
Allowance for loan losses     4,313,000        
Foreclosed assets     (1,518,000)        
Premises and equipment     1,339,000        
Bank owned life insurance            
Other assets     6,000        
Total assets acquired     (55,000)        
Non-interest bearing transaction accounts            
Interest bearing transaction accounts and savings deposits            
Time deposits            
Total deposits            
Securities sold under agreement to repurchase            
Accrued interest and other liabilities     1,530,000        
Total liabilities assumed     1,577,000        
Equity     (54,556,000)        
Total liabilities and equity assumed     (52,979,000)        
Federal funds sold            
FHLB borrowings     47,000        
Citizens National Bank [Member] | Fair Value Adjustments [Member] | Core Deposit Premium [Member]              
Intangibles     5,075,000        
Citizens National Bank [Member] | Fair Value Adjustments [Member] | Other Intangible Assets [Member]              
Intangibles     $ 591,000        
Liberty Bancshares, Inc. [Member]              
Investment securities         $ 98,788,000    
Allowance for loan losses            
Premises and equipment         31,024,000    
Bank owned life insurance         16,972,000    
Goodwill         95,207,000    
Total assets acquired         1,066,272,000    
Non-interest bearing transaction accounts         146,618,000    
Interest bearing transaction accounts and savings deposits         543,183,000    
Time deposits         184,913,000    
Total deposits         874,714,000    
Accrued interest and other liabilities         8,128,000    
Total liabilities assumed         949,303,000    
Equity            
Total liabilities and equity assumed         949,303,000    
Net assets acquired         116,969,000    
Purchase price         212,176,000    
Goodwill         95,207,000    
Federal funds sold         7,060,000    
FHLB borrowings         46,351,000    
Cash and due from banks, including time deposits         102,623,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share         780,658,000    
Core deposit intangible         14,556,000    
Other intangibles            
Other assets         14,591,000    
Subordinated debentures         20,110,000    
Liberty Bancshares, Inc. [Member] | Cost Acquired [Member]              
Investment securities         99,123,000    
Allowance for loan losses         (10,422,000)    
Premises and equipment         34,239,000    
Bank owned life insurance         16,972,000    
Total assets acquired         1,061,567,000    
Non-interest bearing transaction accounts         146,618,000    
Interest bearing transaction accounts and savings deposits         543,183,000    
Time deposits         184,913,000    
Total deposits         874,714,000    
Accrued interest and other liabilities         7,828,000    
Total liabilities assumed         949,290,000    
Equity         112,277,000    
Total liabilities and equity assumed         1,061,567,000    
Federal funds sold         7,060,000    
FHLB borrowings         46,128,000    
Cash and due from banks, including time deposits         102,637,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share         790,493,000    
Core deposit intangible         699,000    
Other intangibles         3,063,000    
Other assets         17,703,000    
Subordinated debentures         20,620,000    
Liberty Bancshares, Inc. [Member] | Fair Value Adjustments [Member]              
Investment securities         (335,000)    
Allowance for loan losses         10,422,000    
Premises and equipment         (3,215,000)    
Bank owned life insurance            
Total assets acquired         4,705,000    
Non-interest bearing transaction accounts            
Interest bearing transaction accounts and savings deposits            
Time deposits            
Total deposits            
Accrued interest and other liabilities         300,000    
Total liabilities assumed         13,000    
Equity         (112,277,000)    
Total liabilities and equity assumed         (112,264,000)    
Federal funds sold            
FHLB borrowings         223,000    
Cash and due from banks, including time deposits         (14,000)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share         (9,835,000)    
Core deposit intangible         13,857,000    
Other intangibles         (3,063,000)    
Other assets         (3,112,000)    
Subordinated debentures         (510,000)    
Community First Bancshares Inc [Member]              
Cash and due from banks         39,848,000    
Investment securities         566,818,000    
Allowance for loan losses            
Premises and equipment         42,043,000    
Bank owned life insurance         22,149,000    
Goodwill         110,440,000    
Total assets acquired         1,915,061,000    
Non-interest bearing transaction accounts         103,825,000    
Interest bearing transaction accounts and savings deposits         995,207,000    
Time deposits         437,030,000    
Total deposits         1,536,062,000    
Accrued interest and other liabilities         9,370,000    
Total liabilities assumed         1,726,297,000    
Equity            
Total liabilities and equity assumed         1,726,297,000    
Net assets acquired         188,764,000    
Purchase price         299,204,000    
Goodwill         110,440,000    
Federal funds sold         76,508,000    
FHLB borrowings         143,721,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share         1,136,543,000    
Core deposit intangible         11,273,000    
Other intangibles         420,000    
Other assets         11,474,000    
Subordinated debentures         20,914,000    
Foreclosed assets not covered by FDIC loss share         747,000    
Deferred tax asset         7,238,000    
Federal funds purchased and securities sold under agreement to repurchase         16,230,000    
Community First Bancshares Inc [Member] | Cost Acquired [Member]              
Cash and due from banks         39,848,000    
Investment securities         570,199,000    
Allowance for loan losses         (14,635,000)    
Premises and equipment         44,837,000    
Bank owned life insurance         22,149,000    
Goodwill         100,000    
Total assets acquired         1,918,325,000    
Non-interest bearing transaction accounts         103,825,000    
Interest bearing transaction accounts and savings deposits         995,207,000    
Time deposits         436,181,000    
Total deposits         1,535,213,000    
Accrued interest and other liabilities         8,769,000    
Total liabilities assumed         1,725,013,000    
Equity         193,312,000    
Total liabilities and equity assumed         1,918,325,000    
Goodwill         100,000    
Federal funds sold         76,508,000    
FHLB borrowings         143,047,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share         1,163,398,000    
Core deposit intangible            
Other intangibles            
Other assets         11,474,000    
Subordinated debentures         21,754,000    
Foreclosed assets not covered by FDIC loss share         747,000    
Deferred tax asset         3,700,000    
Federal funds purchased and securities sold under agreement to repurchase         16,230,000    
Community First Bancshares Inc [Member] | Fair Value Adjustments [Member]              
Cash and due from banks            
Investment securities         (3,381,000)    
Allowance for loan losses         14,635,000    
Premises and equipment         (2,794,000)    
Bank owned life insurance            
Goodwill         (100,000)    
Total assets acquired         (3,264,000)    
Non-interest bearing transaction accounts            
Interest bearing transaction accounts and savings deposits            
Time deposits         849,000    
Total deposits         849,000    
Accrued interest and other liabilities         601,000    
Total liabilities assumed         1,284,000    
Equity         (193,312,000)    
Total liabilities and equity assumed         (192,028,000)    
Goodwill         (100,000)    
Federal funds sold            
FHLB borrowings         674,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share         (26,855,000)    
Core deposit intangible         11,273,000    
Other intangibles         420,000    
Other assets            
Subordinated debentures         (840,000)    
Foreclosed assets not covered by FDIC loss share            
Deferred tax asset         3,538,000    
Federal funds purchased and securities sold under agreement to repurchase            
OTIC and TCO [Member]              
Cash and due from banks       $ 1,756,000      
Investment securities       241,000      
Premises and equipment       1,544,000      
Goodwill       13,268,000      
Total assets acquired       14,895,000      
Accrued interest and other liabilities       302,000      
Total liabilities assumed       4,540,000      
Equity            
Total liabilities and equity assumed       4,540,000      
Net assets acquired       10,355,000      
Purchase price       23,623,000      
Goodwill       13,268,000      
Other intangibles       9,733,000      
Other assets       1,621,000      
Deferred tax liability       4,238,000      
OTIC and TCO [Member] | Cost Acquired [Member]              
Cash and due from banks       1,756,000      
Investment securities       241,000      
Premises and equipment       1,126,000      
Total assets acquired       3,875,000      
Accrued interest and other liabilities       302,000      
Total liabilities assumed       365,000      
Equity       3,510,000      
Total liabilities and equity assumed       3,875,000      
Other intangibles            
Other assets       752,000      
Deferred tax liability       63,000      
OTIC and TCO [Member] | Fair Value Adjustments [Member]              
Cash and due from banks            
Investment securities            
Premises and equipment       418,000      
Total assets acquired       11,020,000      
Accrued interest and other liabilities            
Total liabilities assumed       4,175,000      
Equity       (3,510,000)      
Total liabilities and equity assumed       665,000      
Other intangibles       9,733,000      
Other assets       869,000      
Deferred tax liability       $ 4,175,000