Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Loans	$ 286,166	$ 268,279	$ 266,284
Taxable securities	30,774	28,754	20,459
Tax-exempt securities	11,842	10,830	9,837
Interest-earning deposits	109	179	355
Total interest income	328,891	308,042	296,935
Interest Expense
Deposits	2,977	3,005	3,962
Federal Home Loan Bank and Federal Reserve Bank borrowings	474	396	(404)
Prepayment charge on Federal Home Loan Bank advances	0	0	1,548
Other borrowings	553	593	734
Total interest expense	4,004	3,994	5,840
Net Interest Income	324,887	304,048	291,095
Provision (recapture) for loan and lease losses	8,591	6,727	(101)
Net interest income after provision (recapture) for loan and lease losses	316,296	297,321	291,196
Noninterest Income (Loss)
Service charges and other fees	61,881	55,555	48,351
Merchant services fees	8,975	7,975	8,812
Gain on sale of investment securities, net	1,581	552	462
Bank owned life insurance	4,441	3,823	3,570
Change in FDIC loss sharing asset	(4,010)	(19,989)	(45,017)
Other	18,605	11,834	10,522
Total noninterest income (loss)	91,473	59,750	26,700
Noninterest Expense
Compensation and employee benefits	149,410	130,864	125,432
Occupancy	34,818	32,300	33,054
Merchant processing	4,204	4,006	3,551
Advertising and promotion	4,713	3,964	4,090
Data processing	17,421	15,369	14,076
Legal and professional fees	9,608	11,389	12,338
Taxes, licenses and fees	5,395	4,552	5,033
Regulatory premiums	4,806	4,549	4,706
Net cost (benefit) of operation of other real estate owned	(1,629)	(1,045)	(7,401)
Amortization of intangibles	6,882	6,293	6,045
Other	30,521	27,045	29,962
Total noninterest expense	266,149	239,286	230,886
Income before income taxes	141,620	117,785	87,010
Provision for income taxes	42,793	36,211	26,994
Net Income	$ 98,827	$ 81,574	$ 60,016
Per Common Share
Basic earnings per common share	$ 1.71	$ 1.53	$ 1.24
Diluted earnings per common share	$ 1.71	$ 1.52	$ 1.21
Weighted average number of common shares outstanding	57,019	52,618	47,993
Weighted average number of diluted common shares outstanding	57,032	53,183	49,051