Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities
Net Income	$ 23,428	$ 26,177	$ 24,766
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	3,816	4,735	6,299
Depreciation and amortization	4,707	3,703	3,189
Stock-based compensation expense	538	1,025	809
Decrease in interest receivable	216	444	361
Amortization of intangible assets	657	577	577
Gain on sale of building	(479)
Net (increase) decrease in trading assets	(56)	60	(579)
Net (gains) losses on sale and other-than-temporary impairment of securities	(2,498)	(2,076)	409
Increase in other real estate owned valuation allowance and loss on disposition	479	188	1,606
Originations of mortgage loans held for sale	(10,886)	(29,126)	(25,615)
Proceeds from the sale of mortgage loans	17,215	28,885	20,193
Gain on sale of mortgage loans	(268)	(292)	(106)
Decrease in prepaid FDIC assessment	1,190	1,359	2,042
Decrease (increase) in other assets	150	(3,187)	(1,530)
Increase in other liabilities	4,120	951	3,387
Net cash provided by operating activities	42,329	33,423	35,808
Investing Activities
Cash acquired in branch acquisition	267,689
Proceeds from sale and maturities of securities held to maturity		251	1,765
Proceeds from sales and maturities of securities available for sale	274,621	227,003	203,172
Purchase of securities available for sale	(462,552)	(219,092)	(279,313)
Net (increase) decrease in loans	(50,194)	2,992	(7,061)
Proceeds from sale of FHLB stock	928
Proceeds from sale of building	2,235
Proceeds from sale of other real estate owned	2,070	2,506	2,965
Proceeds from bank-owned life insurance		1,656
Recoveries of previously charged-off loans	744	1,002	1,269
Purchase of premises and equipment	(3,403)	(1,516)	(2,459)
Net cash provided (used) by investing activities	32,138	14,802	(79,662)
Financing Activities
Net increase in deposits	50,544	75,559	19,992
Proceeds from Federal Home Loan Bank long-term advances		235,000	75,000
Repayments on Federal Home Loan Bank long-term advances	(80,456)	(312,355)	(70,387)
Net change in short-term Federal Home Loan Bank borrowings	(17,200)	(28,575)	5,100
Net increase in other borrowed funds	1,586	2,509	22,985
Common stock repurchase	(2,097)	(389)	(49)
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit	(212)	(134)	114
Cash dividends paid on common stock	(7,667)	(11,524)	(7,664)
Net cash (used) provided by financing activities	(55,502)	(39,909)	45,091
Net increase in cash and cash equivalents	18,965	8,316	1,237
Cash and cash equivalents at beginning of year	39,325	31,009	29,772
Cash and cash equivalents at end of year	58,290	39,325	31,009
Supplemental information
Interest paid	17,456	23,901	30,969
Income taxes paid	6,363	12,097	12,985
Transfer from loans to other real estate owned	$ 1,767	$ 1,989	$ 1,479