Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities
Net income	$ 24,565	$ 26,907
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan and lease losses	12,060	8,574
Depreciation and amortization of premises and equipment	3,828	3,020
Net accretion on securities	2,811	1,197
Amortization of intangible assets	2,202	1,660
Stock based compensation	2,726	2,797
Bank owned life insurance income	(1,735)	(1,589)
Purchases of trading securities	(949)	(657)
Unrealized (gains) losses in trading securities	(225)	78
Deferred income tax benefit	(519)	(1,794)
Proceeds from sale of loans held for sale	39,060	28,774
Originations and purchases of loans held for sale	(40,233)	(34,182)
Net gains on sales of loans held for sale	(817)	(894)
Net security gains	(1,084)	(552)
Net gains on sales of other real estate owned	(571)	(417)
Net decrease in other assets	9,144	11,099
Net decrease in other liabilities	(8,333)	(10,897)
Net cash provided by operating activities	41,930	33,124
Investing activities
Net cash provided by acquisitions	80,909	53,121
Securities available for sale:
Proceeds from maturities, calls, and principal paydowns	234,543	205,390
Proceeds from sales	26,236	1,791
Purchases	(219,000)	(185,112)
Securities held to maturity:
Proceeds from maturities, calls, and principal paydowns	16,822	16,655
Purchases	(71,988)	(9,858)
Net increase in loans	(119,872)	(142,433)
Net increase in Federal Reserve and FHLB stock	(5,584)	(672)
Purchases of premises and equipment	(2,272)	(2,769)
Proceeds from sales of other real estate owned	2,122	1,661
Net cash used in investing activities	(58,084)	(62,226)
Financing activities
Net (decrease) increase in deposits	(19,593)	39,653
Net increase in short-term borrowings	201,066	30,611
Repayments of long-term debt	(163,307)	(3,347)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	(965)	690
Purchase of treasury stock	(5,460)	(15,490)
Cash dividends and payment for fractional shares	(15,568)	(13,232)
Net cash used in financing activities	(3,827)	38,885
Net (decrease) increase in cash and cash equivalents	(19,981)	9,783
Cash and cash equivalents at beginning of period	163,668	129,381
Cash and cash equivalents at end of period	143,687	139,164
Cash paid during the period for:
Interest	16,853	18,245
Income taxes paid	4,525	14,122
Noncash investing activities:
Loans transferred to OREO	3,031	889
Acquisitions:
Fair value of assets acquired	1,503,810	258,256
Fair value of liabilities assumed	1,284,038	285,403
Fair value of debt issued in purchase combination	$ 0	$ 150