Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
INTEREST INCOME
Loans	$ 268,367,000	$ 164,082,000	$ 128,171,000
Federal funds sold	126,000	27,000	19,000
Investment securities	30,613,000	19,357,000	13,300,000
Mortgage loans held for sale	1,051,000	695,000	467,000
Assets held in trading accounts	18,000	17,000	29,000
Interest bearing balances due from banks	773,000	857,000	1,127,000
TOTAL INTEREST INCOME	300,948,000	185,035,000	143,113,000
INTEREST EXPENSE
Deposits	15,248,000	9,079,000	8,399,000
Federal funds purchased and securities sold under agreements to repurchase	236,000	269,000	219,000
Other borrowings	5,097,000	3,986,000	3,001,000
Subordinated debentures	1,772,000	637,000	644,000
TOTAL INTEREST EXPENSE	22,353,000	13,971,000	12,263,000
NET INTEREST INCOME	278,595,000	171,064,000	130,850,000
Provision for loan losses	9,022,000	7,245,000	4,118,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	269,573,000	163,819,000	126,732,000
NON-INTEREST INCOME
Trust income	9,261,000	7,111,000	5,842,000
Service charges on deposit accounts	30,985,000	25,650,000	18,815,000
Other service charges and fees	9,921,000	3,574,000	2,997,000
Mortgage lending income	11,452,000	5,342,000	4,592,000
Investment banking income	2,590,000	1,070,000	1,811,000
Debit and credit card fees	26,660,000	22,866,000	17,833,000
Bank owned life insurance income	2,680,000	1,843,000	1,319,000
Gain (loss) on sale of securities, net	307,000	8,000	(151,000)
Net (loss) gain on assets covered by FDIC loss share agreements	(14,812,000)	(20,316,000)	(16,188,000)
Other income	16,782,000	15,044,000	3,746,000
TOTAL NON-INTEREST INCOME	95,826,000	62,192,000	40,616,000
NON-INTEREST EXPENSE
Salaries and employee benefits	139,408,000	89,210,000	74,078,000
Occupancy expense, net	16,858,000	12,833,000	10,034,000
Furniture and equipment expense	14,352,000	9,325,000	7,623,000
Other real estate and foreclosure expense	4,861,000	4,507,000	1,337,000
Deposit insurance	4,201,000	3,354,000	2,482,000
Merger related costs	13,760,000	7,470,000	6,376,000
Other operating expenses	64,695,000	49,022,000	32,882,000
TOTAL NON-INTEREST EXPENSE	258,135,000	175,721,000	134,812,000
INCOME BEFORE INCOME TAXES	107,264,000	50,290,000	32,536,000
Provision for income taxes	32,900,000	14,602,000	9,305,000
NET INCOME	74,364,000	35,688,000	23,231,000
Preferred stock dividends	257,000
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 74,107,000	$ 35,688,000	$ 23,231,000
BASIC EARNINGS PER SHARE (in Dollars per share)	$ 2.64	$ 2.11	$ 1.42
DILUTED EARNINGS PER SHARE (in Dollars per share)	$ 2.63	$ 2.11	$ 1.42