Consolidated Statements of Income (Unaudited) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest Income
Loans, excluding covered loans	$ 59,111,000	$ 61,993,000	$ 118,542,000	$ 123,484,000
Covered loans	4,151,000	4,473,000	7,600,000	8,675,000
Investment securities	7,657,000	8,414,000	15,013,000	17,348,000
Other short-term investments	834,000	638,000	1,643,000	1,279,000
Total interest income	71,753,000	75,518,000	142,798,000	150,786,000
Interest Expense
Deposits	3,003,000	4,678,000	6,323,000	10,191,000
Borrowed funds	385,000	490,000	827,000	1,005,000
Senior and subordinated debt	3,435,000	3,646,000	6,870,000	7,704,000
Total interest expense	6,823,000	8,814,000	14,020,000	18,900,000
Net interest income	64,930,000	66,704,000	128,778,000	131,886,000
Provision for loan and covered loan losses	5,813,000	22,458,000	11,487,000	40,668,000
Net interest income after provision for loan and covered loan losses	59,117,000	44,246,000	117,291,000	91,218,000
Noninterest Income
Service charges on deposit accounts	9,118,000	8,848,000	17,795,000	17,508,000
Card-based fees	5,547,000	5,312,000	10,623,000	10,332,000
Wealth management fees	6,126,000	5,394,000	11,965,000	10,786,000
Mortgage banking income	1,040,000		3,006,000
Merchant servicing fees	2,899,000	2,908,000	5,453,000	5,230,000
Other service charges, commissions, and fees	1,278,000	1,189,000	2,924,000	2,387,000
Other income	1,217,000	235,000	3,034,000	3,275,000
Net securities gains (losses)	216,000	151,000	216,000	(792,000)
Total noninterest income	27,441,000	24,037,000	55,016,000	48,726,000
Noninterest Expense
Salaries and wages	26,820,000	23,852,000	55,783,000	51,109,000
Retirement and other employee benefits	6,101,000	5,714,000	13,707,000	12,507,000
Net occupancy and equipment expense	7,793,000	7,513,000	15,940,000	15,844,000
Technology and related costs	2,884,000	2,851,000	5,367,000	5,709,000
Professional services	5,595,000	6,905,000	10,813,000	12,534,000
Net OREO expense	1,084,000	4,124,000	2,883,000	5,988,000
FDIC premiums	1,704,000	1,659,000	3,446,000	3,378,000
Other expenses	10,446,000	8,539,000	19,302,000	16,701,000
Total noninterest expense	62,427,000	61,157,000	127,241,000	123,770,000
Income before income tax expense	24,131,000	7,126,000	45,066,000	16,174,000
Income tax expense	7,955,000	761,000	14,248,000	1,917,000
Net income	16,176,000	6,365,000	30,818,000	14,257,000
Net income applicable to non-vested restricted shares	(219,000)	(76,000)	(431,000)	(215,000)
Net income applicable to common shares	$ 15,957,000	$ 6,289,000	$ 30,387,000	$ 14,042,000
Per Common Share Data
Basic earnings per common share (in Dollars per share)	$ 0.22	$ 0.09	$ 0.41	$ 0.19
Diluted earnings per common share (in Dollars per share)	$ 0.22	$ 0.09	$ 0.41	$ 0.19
Dividends declared per common share (in Dollars per share)	$ 0.04	$ 0.01	$ 0.05	$ 0.02
Weighted-average common shares outstanding (in Shares)	74,017	73,659	73,942	73,582
Weighted-average diluted common shares outstanding (in Shares)	74,024	73,659	73,950	73,582