Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities
Net income	$ 7,141	$ 6,001
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,142	922
Depreciation and amortization of property, plant, and equipment	1,227	937
Accretion of discounts and amortization of premiums on investments	(330)	467
Accretion of FDIC receivable for loss share agreements	(1,539)
Amortization of intangible assets	179	233
Gain on sale of loans	(454)	(239)
Equity-based compensation expense	32	31
Gain on sale of property, plant, and equipment	(48)	(1)
Loss on sales of other real estate	613	649
Gain on sale of securities	(117)	(51)
Gain on prepayment of debt	(296)
Proceeds from sale of mortgage loans	28,226	19,163
Origination of mortgage loans	(23,894)	(16,626)
(Increase) decrease in accrued interest receivable	(324)	307
(Increase) decrease in other operating activities	(9,112)	8,318
Net cash provided by operating activities	5,524	20,111
Investing activities
Proceeds from sale of securities available-for-sale	75,506	10,051
Proceeds from maturities, prepayments, and calls of securities available-for-sale	19,757	21,232
Proceeds from maturities, prepayments, and calls of securities held-to-maturity		620
Payments to acquire securities available-for-sale	(99,532)	(27,059)
Collections of loans	31,277	8,028
Proceeds from the redemption of (payments to acquire) FHLB stock, net	1,184	(720)
Proceeds from the FDIC	1,141
Payments to acquire property, plant, and equipment	(1,219)	(833)
Proceeds from sale of property, plant, and equipment	96	2
Proceeds from sale of other real estate	1,041	1,623
Net cash provided by investing activities	29,251	12,944
Financing activities
Net increase in noninterest-bearing deposits	12,566	13,084
Net increase in interest-bearing deposits	4,756	23,199
Repayments of securities sold under agreements to repurchase	(14,612)	(4,942)
Repayments of long-term debt	(11,558)	(8)
Proceeds from stock options exercised	12
Payments for repurchase of treasury stock	(1,077)
Excess tax benefit from share-based compensation
Payments of common dividends	(2,407)	(1,786)
Payments of preferred dividends	(261)	(284)
Net cash (used in) provided by financing activities	(12,581)	29,263
Increase in cash and cash equivalents	22,194	62,318
Cash and cash equivalents at beginning of period	144,847	47,294
Cash and cash equivalents at end of period	167,041	109,612
Supplemental information - noncash items
Transfer of other real estate	6,865	1,027
Loans originated to finance other real estate	$ 2,864	$ 840