Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest income:
Loans, including fees	$ 79,406	$ 79,322	$ 158,254	$ 161,163
Investment securities:
Taxable	3,822	3,997	7,484	7,878
Tax-exempt	1,072	1,071	2,150	2,227
Federal funds sold and securities purchased under agreements to resell	464	441	875	901
Total interest income	84,764	84,831	168,763	172,169
Interest expense:
Deposits	1,737	2,261	3,740	4,654
Federal funds purchased and securities sold under agreements to repurchase	105	89	201	191
Other borrowings	646	1,508	1,497	3,009
Total interest expense	2,488	3,858	5,438	7,854
Net interest income	82,276	80,973	163,325	164,315
Provision for loan losses	3,144	2,169	3,963	3,018
Net interest income after provision for loan losses	79,132	78,804	159,362	161,297
Noninterest income:
Fees on deposit accounts	17,699	17,617	34,192	34,441
Mortgage banking income	7,089	4,683	13,715	7,974
Trust and investment services income	5,051	4,812	9,985	9,355
Securities gains		88		88
Amortization of FDIC indemnification assets, net	(2,042)	(5,815)	(5,249)	(12,893)
Other	2,285	3,014	3,945	6,113
Total noninterest income	30,082	24,399	56,588	45,078
Noninterest expense:
Salaries and employee benefits	39,754	40,276	80,741	79,369
Net occupancy expense	5,046	5,763	10,283	11,371
Information services expense	4,382	4,435	8,340	8,833
Furniture and equipment expense	2,762	3,264	5,907	7,006
Bankcard expense	2,285	2,088	4,265	4,344
Branch consolidation expense	2,237		2,237
OREO expense and loan related	2,019	1,736	5,033	5,939
Amortization of intangibles	1,964	2,084	3,980	4,188
Supplies, printing and postage expense	1,430	1,599	3,042	3,182
Professional fees	1,585	1,115	2,994	2,379
FDIC assessment and other regulatory charges	1,253	1,267	2,437	2,843
Advertising and marketing	1,009	892	1,864	1,745
Merger and branding related expense		6,510		12,495
Other	5,803	4,860	10,891	9,618
Total noninterest expense	71,529	75,889	142,014	153,312
Earnings:
Income before provision for income taxes	37,685	27,314	73,936	53,063
Provision for income taxes	12,813	9,368	25,138	18,200
Net income	24,872	17,946	48,798	34,863
Preferred stock dividends				1,073
Net income available to common shareholders	$ 24,872	$ 17,946	$ 48,798	$ 33,790
Earnings per common share:
Basic (in dollars per share)	$ 1.04	$ 0.75	$ 2.04	$ 1.41
Diluted (in dollars per share)	1.03	0.74	2.02	1.40
Dividends per common share (in dollars per share)	$ 0.24	$ 0.20	$ 0.47	$ 0.39
Weighted-average common shares outstanding:
Basic (in shares)	23,981	23,892	23,947	23,882
Diluted (in shares)	24,258	24,141	24,214	24,126