Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities:
Net income	$ 20,857	$ 19,287
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	4,975	9,025
Depreciation, amortization and accretion, net	4,940	4,259
Deferred income tax benefit	(1,229)	(1,487)
Gain on sale of securities available for sale	(2,333)	(2,882)
Origination of mortgage loans held for sale	(129,742)	(166,297)
Proceeds from sale of mortgage loans held for sale	142,293	160,143
Bank owned life insurance income	(771)	(743)
Increase decrease in value of private investment fund		(637)
Proceeds from liquidation of private investment fund		2,846
Loss on the disposal of premises and equipment	22	47
Loss on the sale of other real estate	365	1,177
Gain on acquisition	(449)
Stock compensation expense	1,473	1,118
Excess tax benefits from share-based compensation arrangements	(109)	(57)
Decrease (increase) in accrued interest receivable and other assets	3,683	(1,956)
Increase in accrued interest payable and other liabilities	4,498	3,394
Net cash provided by operating activities	48,473	27,237
Investing activities:
Purchases of securities available for sale	(282,262)	(330,192)
Proceeds from sale of securities available for sale	701
Proceeds from maturities of securities available for sale	337,762	321,404
Net increase in loans	(95,157)	(44,306)
Purchases of premises and equipment	(1,807)	(3,231)
Acquisition, net of cash acquired	8,963
Proceeds from sale of foreclosed assets	3,102	2,475
Net cash used in investing activities	(28,698)	(53,850)
Financing activities:
Net (decrease) increase in deposits	(19,677)	72,291
Net increase (decrease) in securities sold under agreements to repurchase and federal funds purchased	9,727	(29,864)
Proceeds from Federal Home Loan Bank advances	575	30,000
Repayments of Federal Home Loan Bank advances	(35)	(30,008)
Prepayment penalty on modification of Federal Home Loan Bank advances		(872)
Repayments of subordinated debentures		(10,000)
Issuance of common stock for options and dividend reinvestment plan	1,260	585
Excess tax benefits from share-based compensation arrangements	109	57
Common stock repurchases	(315)	(204)
Cash dividends paid	(8,602)	(7,909)
Net cash (used in) provided by financing activities	(16,958)	24,076
Net increase (decrease) in cash and cash equivalents	2,817	(2,537)
Cash and cash equivalents at beginning of period	67,703	54,920
Cash and cash equivalents at end of period	70,520	52,383
Supplemental cash flow information:
Income tax payments	6,230	8,025
Cash paid for interest	6,984	9,257
Supplemental non-cash activity:
Transfers from loans to other real estate owned	$ 2,382	$ 3,336