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	$ 35,074	$ 29,724	$ 24,051
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,700	4,700	6,000
Depreciation of premises and equipment	3,213	3,174	3,083
Foreclosed and repossessed property valuation adjustments	350	642	618
Net gain on sale of premises	(358)	(211)	0
Net amortization of premium and discount	2,127	1,768	797
Net amortization of intangibles	728	951	1,091
Non–cash charitable contribution	0	990	0
Share–based compensation	1,962	1,394	909
Deferred income tax expense (benefit)	1,328	(863)	(688)
Earnings from bank-owned life insurance	(2,448)	(1,939)	(1,887)
Net gains on loan sales and commissions on loans originated for others	(14,092)	(5,074)	(4,052)
Net realized gains on securities	(1,223)	(698)	(729)
Net impairment losses recognized in earnings	221	191	417
Net (gains) losses on interest rate swap contracts	(255)	(6)	36
Equity in (earnings) losses of unconsolidated subsidiaries	(196)	213	337
Proceeds from sales of loans	479,925	208,275	201,450
Loans originated for sale	(495,271)	(206,242)	(201,771)
(Increase) decrease in other assets	(7,987)	(2,804)	646
(Decrease) increase in other liabilities	(331)	3,014	131
Net cash provided by operating activities	5,467	37,199	30,439
Cash flows from investing activities:
Purchases of mortgage-backed securities available for sale	0	(115,208)	(122,240)
Purchases of other investment securities available for sale	0	(5,000)	(40,886)
Purchases of mortgage-backed securities held to maturity	0	(53,720)	0
Proceeds from sales of mortgage-backed securities available for sale	40,222	46,889	64,275
Proceeds from sales of other investment securities available for sale	6,338	9,572	34,822
Maturities and principal payments of mortgage-backed securities available for sale	111,906	115,500	150,062
Maturities and principal payments of other investment securities available for sale	1,411	855	12,000
Maturities and principal payments of mortgage-backed securities held to maturity	11,177	1,489	0
Remittance of Federal Home Loan Bank stock	1,590	0	0
Net increase in loans	(138,084)	(148,652)	(77,382)
Purchases of loans, including purchased interest	(10,469)	(9,677)	(2,842)
Proceeds from the sale of property acquired through foreclosure or repossession	3,366	2,190	821
Purchases of premises and equipment	(5,110)	(3,644)	(1,683)
Net proceeds from sale of bank property	1,571	1,279	0
Purchases of bank-owned life insurance	0	0	(5,000)
Proceeds from bank-owned life insurance	1,419	0	0
Equity investment in real estate limited partnership	0	(449)	(1,798)
Net cash provided by (used in) investing activities	25,337	(158,576)	10,149
Cash flows from financing activities:
Net increase in deposits	186,316	89,985	113,320
Net (decrease) increase in other borrowings	(18,546)	(3,601)	1,858
Proceeds from Federal Home Loan Bank advances	627,179	514,475	204,540
Repayment of Federal Home Loan Bank advances	(806,457)	(472,747)	(313,144)
Issuance of treasury stock, including net deferred compensation plan activity	0	0	44
Proceeds from the issuance of common stock under dividend reinvestment plan	0	754	1,002
Proceeds from the exercise of stock options and issuance of other compensation-related equity instruments	1,257	885	785
Tax benefit (expense) from stock option exercises and issuance of other compensation-related equity instruments	210	115	65
Cash dividends paid	(15,133)	(14,205)	(13,582)
Net cash (used in) provided by financing activities	(25,174)	115,661	(5,112)
Net increase (decrease) in cash and cash equivalents	5,630	(5,716)	35,476
Cash and cash equivalents at beginning of year	87,020	92,736	57,260
Cash and cash equivalents at end of year	92,650	87,020	92,736
Noncash Investing and Financing Activities:
Loans charged off	2,355	3,834	5,402
Loans transferred to property acquired through foreclosure or repossession	3,167	2,031	3,255
OREO proceeds due from attorney	132	0	0
Supplemental Disclosures:
Interest payments	29,657	35,594	44,244
Income tax payments	$ 14,777	$ 13,390	$ 10,663