Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Income
Interest and fees on loans	$ 195,590	$ 193,193	$ 197,897
Interest on investment securities:
Taxable	10,234	9,890	9,423
Tax-exempt	6,394	5,931	5,860
Dividends on nonmarketable equity securities	1,105	1,041	965
Interest on deposits with the Federal Reserve Bank	738	703	1,097
Total Interest Income	214,061	210,758	215,242
Interest Expense
Interest on deposits	16,883	21,782	29,293
Interest on short-term borrowings	484	426	524
Interest on FHLB advances	47	1,005	1,572
Total Interest Expense	17,414	23,213	31,389
Net Interest Income	196,647	187,545	183,853
Provision for loan losses	11,000	18,500	26,000
Net Interest Income after Provision for Loan Losses	185,647	169,045	157,853
Noninterest Income
Service charges and fees on deposit accounts	21,939	19,581	18,452
Wealth management revenue	13,989	11,763	11,104
Other charges and fees for customer services	17,151	14,227	12,991
Mortgage banking revenue	5,336	6,597	3,881
Gain on sale of investment securities	1,133	34	0
Gain on sale of merchant card services	0	1,280	0
Other	861	1,202	462
Total Noninterest Income	60,409	54,684	46,890
Operating Expenses
Salaries, wages and employee benefits	96,419	84,383	74,493
Occupancy	13,934	12,413	12,974
Equipment and software	13,734	13,112	11,935
Other	40,861	42,013	45,091
Total Operating Expenses	164,948	151,921	144,493
Income Before Income Taxes	81,108	71,808	60,250
Federal income tax expense	24,300	20,800	17,200
Net Income	$ 56,808	$ 51,008	$ 43,050
Net Income Per Common Share
Basic	$ 2.02	$ 1.86	$ 1.57
Diluted	$ 2.00	$ 1.85	$ 1.57
Cash Dividends Declared Per Common Share	$ 0.87	$ 0.82	$ 0.80