CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 33,188	$ 17,348	$ 13,615
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	9,590	7,563	8,526
Net amortization of securities	1,937	1,317	2,352
Change in unamortized net loan costs and premiums	(1,377)	316	1,462
Premises and equipment depreciation and amortization expense	6,045	4,849	3,817
Stock-based compensation expense	2,260	1,450	1,601
Accretion of purchase accounting entries	(9,281)	(5,319)	(1,490)
Amortization of other intangibles	5,339	4,401	3,021
Write down of other real estate owned	45	2,000
Excess tax loss from stock-based payment arrangements	(1,126)	(68)	94
Income from cash surrender value of bank-owned life insurance policies	(2,716)	(2,120)	(1,398)
Gain on sales of securities, net	(1,655)	(2,113)
Net (increase) decrease in loans held for sale	(35,451)	(412)	3,103
Loss on disposition of assets	2,124
Loss on sale of real estate	128	(50)
Net change in other	19,604	11,007	5,982
Net cash provided by operating activities	28,654	40,169	40,685
Cash flows from investing activities:
Net decrease in trading security	486	464	440
Proceeds from sales of securities available for sale	85,711	9,522
Proceeds from maturities, calls and prepayments of securities available for sale	102,590	119,939	121,326
Purchases of securities available for sale	(124,183)	(201,527)	(109,690)
Proceeds from maturities, calls and prepayments of securities held to maturity	30,282	10,625	19,897
Purchases of securities held to maturity	(21,965)	(13,101)	(18,713)
Net change in loans	(160,204)	(44,849)	(192,306)
Acquisitions, net of cash paid	(111,328)	179,308
Net cash used for Divestiture	(48,890)	(85,733)
Proceeds from surrender of bank-owned life insurance	766		2,217
Purchase of bank-owned life insurance			(10,000)
Proceeds from sale of Federal Home Loan Bank stock	6,781	3,601
Purchase of Federal Home Loan Bank stock		(1,387)
Proceeds from sale of premises and equipment	260	718
Purchase of premises and equipment, net	(18,890)	(7,988)	(5,020)
Net investment in limited partnership tax credits	(565)	(4,909)	(537)
Proceeds from sale of other real estate	3,626	1,230
Net cash used by investing activities	(255,523)	(34,087)	(192,386)
Cash flows from financing activities:
Net increase in deposits	167,002	207,919	217,679
Proceeds from Federal Home Loan Bank advances and other borrowings	485,625	125,480	259,535
Repayments of Federal Home Loan Bank advances and other borrowings	(465,970)	(296,249)	(305,902)
Issuance of long term debt, net	74,138
Net proceeds from reissuance of treasury stock	3,044	252	1,004
Excess tax loss from stock-based payment arrangements	1,126	68	(94)
Common stock cash dividends paid	(15,634)	(11,910)	(8,989)
Net cash provided by financing activities	249,331	25,560	163,233
Net change in cash and cash equivalents	22,462	31,642	11,532
Cash and cash equivalents at beginning of year	75,782	44,140	32,608
Cash and cash equivalents at end of year	98,244	75,782	44,140
Supplemental cash flow information:
Interest paid on deposits	22,921	23,750	26,748
Interest paid on borrowed funds	9,376	8,292	8,174
Income taxes paid (refunded), net	8,869	(164)	(3,452)
Acquisition of non-cash assets and liabilities:
Assets acquired	1,185,957	1,193,018
Liabilities assumed	(969,598)	(1,041,910)
Acquisition's stock owned by the Company	5,193	6,284
Other non-cash changes:
Other net comprehensive income	1,906	1,525	(3,442)
Real estate owned acquired in settlement of loans	$ (2,243)		$ (4,486)