CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 10,359	$ 9,166	$ 8,763
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,900	3,500	4,150
Depreciation and amortization	1,843	1,612	1,453
Net amortization on securities	2,400	1,454	305
Amortization of core deposit intangible	42
Share based compensation expense	1,047	881	750
Net securities gains	(135)	(1,303)	(529)
Increase in accrued interest receivable	(787)	(474)	(53)
Decrease (increase) in other assets	1,593	2,041	(6,875)
(Decrease) increase in accrued expenses and other liabilities	(1,582)	(1,454)	1,529
Net cash provided by operating activities	18,680	15,423	9,493
Cash flows from investing activities:
Purchases of securities available for sale	(302,760)	(226,213)	(113,975)
Purchases of securities, restricted	(315)	(2,055)	(19,514)
Purchases of securities held to maturity	(83,911)	(137,240)	(65,838)
Proceeds from sales of securities available for sale	14,084	31,446	13,087
Redemption of securities, restricted	225	1,976	22,109
Maturities, calls and principal payments of securities available for sale	196,886	175,013	108,838
Maturities, calls and principal payments of securities held to maturity	61,844	66,056	31,752
Net increase in loans	(73,029)	(57,070)	(20,413)
Purchase of premises and equipment	(2,031)	(3,989)	(4,382)
Net cash acquired in business combination	2,309
Net cash used in investing activities	(186,698)	(152,076)	(48,336)
Cash flows from financing activities:
Net increase in deposits	214,252	123,455	134,453
Net (decrease) increase in federal funds purchased and FHLB overnight borrowings	(7,000)	5,000	(70,900)
Repayments of FHLB term advances	(5,016)		(30,000)
Net increase in repurchase agreements	527	1,370
Proceeds from issuance of junior subordinated debentures			16,002
Net proceeds from issuance of common stock	28,088	1,395	255
Net proceeds from exercise of stock options		17	34
Repurchase of surrendered stock from exercise of stock options and vesting of restricted stock awards	(128)	(37)	(35)
Excess tax (expense) benefit from share based compensation	(16)	11	12
Cash dividends paid	(6,061)	(5,787)	(5,716)
Net cash provided by financing activities	224,646	125,424	44,105
Net increase (decrease) in cash and cash equivalents	56,628	(11,229)	5,262
Cash and cash equivalents at beginning of period	22,918	34,147	28,885
Cash and cash equivalents at end of period	79,546	22,918	34,147
Cash paid for:
Interest	7,730	7,838	7,956
Income tax	4,550	5,922	3,264
Noncash investing and financing activities:
Dividends declared and unpaid at end of period		1,467	1,441
Transfers from portfolio loans to loans held for sale	2,300
Acquisition of noncash assets and liabilities:
Fair value of assets acquired	66,566
Fair value of liabilities assumed	$ 65,059