Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities:
Net income	$ 18,590	$ 6,005	$ 9,962
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	3,309	3,492	3,425
Amortization of intangible assets	177	307	328
Provision for loan losses	23,060	37,458	31,450
Amortization of investment securities premium, net	1,435	1,185	348
Originations of loans for resale	(119,855)	(179,504)	(119,290)
Proceeds from sale of loans originated for resale	116,556	181,259	121,088
Gain on sale of loans	(3,037)	(3,647)	(3,466)
Change in market value of mortgage servicing rights	1,107	1,029	551
Provision for losses on foreclosed assets	1,984	1,522	220
Gain on sale of foreclosed assets	(680)	(562)	(168)
Loss on disposal of fixed assets	15	58	138
Increase in cash value of life insurance	(1,885)	(1,847)	(1,879)
Stock option vesting expense	830	800	477
Stock option excess tax benefits	(296)	(390)	(30)
Bargain purchase gain	(7,575)	(232)
Deferred income tax benefit	(1,691)	(4,867)	(3,515)
Change in:
Reserve for unfunded commitments	100	(1,000)	1,075
Interest receivable	(181)	632	172
Interest payable	(477)	(1,463)	(2,532)
Other assets and liabilities, net	178	10,951	(12,411)
Net cash from operating activities	31,664	51,186	25,943
Investing activities:
Proceeds from maturities of securities available-for-sale	84,016	92,427	85,833
Purchases of securities available-for-sale	(25,456)	(156,348)	(29,396)
Redemption (purchase) of restricted equity securities, net	449	837	(39)
Loan principal decreases, net	9,363	102,890	62,663
Proceeds from sale of premises and equipment	1	6	2
Improvement of foreclosed assets		(139)
Proceeds from sale of other real estate owned	7,632	5,172	1,815
Purchases of premises and equipment	(3,350)	(3,156)	(2,633)
Cash received from acquisitions	80,706	18,764
Net cash from investing activities	153,361	60,453	118,245
Financing activities:
Net (decrease) increase in deposits	98,464	(71,340)	159,242
Payments of principal on long-term other borrowings			(90)
Net change in short-term other borrowings	(11,517)	(9,733)	(35,162)
Stock option excess tax benefits	296	390	30
Repurchase of common stock	(753)	(338)
Dividends paid	(5,742)	(6,344)	(8,209)
Exercise of stock options	436	203	235
Net cash from financing activities	81,184	(87,162)	116,046
Net change in cash and cash equivalents	266,209	24,477	260,234
Cash and cash equivalents and beginning of year	371,066	346,589	86,355
Cash and cash equivalents at end of year	637,275	371,066	346,589
Supplemental disclosure of noncash activities:
Unrealized gain (loss) on securities available for sale	2,594	(41)	1,846
Loans transferred to foreclosed assets	6,943	7,690	4,408
Market value of shares tendered by employees in-lieu of cash to pay for exercise of options and/or related taxes	1,992	1,026	652
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	10,715	15,596	23,147
Cash paid for income taxes	16,625	2,825	10,292
Assets acquired in acquisition	270,304	100,282
Liabilities assumed in acquisition	$ 262,729	$ 100,050