CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income:
Loans and leases	$ 42,392	$ 40,610	$ 121,674	$ 120,824
Investment securities, taxable	3,581	3,913	10,774	12,574
Investment securities, tax-exempt	764	826	2,295	2,526
Other	229	231	712	688
Total interest income	46,966	45,580	135,455	136,612
Interest expense:
Deposits	4,089	5,419	13,043	16,868
Short-term borrowings	72	36	149	136
Subordinated notes	1,055	1,647	3,165	4,942
Long-term debt and mandatorily redeemable securities	592	571	1,315	1,399
Total interest expense	5,808	7,673	17,672	23,345
Net interest income	41,158	37,907	117,783	113,267
(Recovery of) provision for loan and lease losses	(419)	650	1,631	4,959
Net interest income after provision for loan and lease losses	41,577	37,257	116,152	108,308
Noninterest income:
Trust fees	5,260	4,055	13,800	12,407
Service charges on deposit accounts	2,364	2,688	6,928	7,747
Debit card income	2,343	2,020	6,752	6,281
Mortgage banking income	1,103	2,020	4,667	5,464
Insurance commissions	1,292	1,483	4,131	4,051
Equipment rental income	4,000	4,604	12,098	14,620
Investment securities and other investment gains	258	89	469	492
Other income	3,538	3,346	10,382	9,556
Total noninterest income	20,158	20,305	59,227	60,618
Noninterest expense:
Salaries and employee benefits	20,441	20,982	59,553	61,668
Net occupancy expense	2,126	1,652	6,480	5,660
Furniture and equipment expense	4,477	3,817	12,285	11,155
Depreciation - leased equipment	3,246	3,795	9,745	11,909
Professional fees	1,178	1,385	3,843	4,232
Supplies and communication	1,330	1,387	4,365	4,165
FDIC and other insurance	874	913	2,679	2,716
Business development and marketing expense	1,306	1,008	3,011	2,925
Loan and lease collection and repossession expense	1,530	1,866	3,382	4,346
Other expense	1,922	388	5,381	3,043
Total noninterest expense	38,430	37,193	110,724	111,819
Income before income taxes	23,305	20,369	64,655	57,107
Income tax expense	8,409	7,364	23,413	19,820
Net income	$ 14,896	$ 13,005	$ 41,242	$ 37,287
Per common share:
Basic net income per common share (in dollars per share)	$ 0.60	$ 0.53	$ 1.67	$ 1.52
Diluted net income per common share (in dollars per share)	$ 0.60	$ 0.53	$ 1.67	$ 1.51
Dividends (in dollars per share)	$ 0.17	$ 0.17	$ 0.51	$ 0.49
Basic weighted average common shares outstanding (in shares)	24,366,220	24,279,178	24,352,073	24,267,535
Diluted weighted average common shares outstanding (in shares)	24,367,109	24,289,495	24,352,854	24,278,160