Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 24,101	$ 18,274
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,119	1,990
Deferred taxes	(1,172)	(1,941)
Stock-based compensation	294	462
Excess tax benefits of stock-based compensation	448	(86)
Provision for loan losses	3,585	7,707
Write-downs of other real estate owned and other repossessed assets	359	2,177
Gains on sale of mortgage loans held for sale	(807)	(728)
Gains on sales of securities	(819)	0
Losses on sale of assets, net	55	105
Proceeds from sale of mortgage loans held for sale	58,418	33,863
Funding of mortgage loans held for sale	(58,115)	(33,301)
Amortization of securities premiums and discounts, net	2,807	1,434
Change in cash surrender value of bank owned life insurance	(688)	(679)
Death benefits received on bank owned life insurance	0	79
Mortgage servicing rights:
Fair value adjustments	119	383
New servicing assets created	(340)	(251)
Changes in:
Other assets	(1,338)	(5,548)
Other liabilities	2,664	11,827
Net cash provided by operating activities	31,690	35,767
Certificates of deposit in other banks:
Maturity of certificates of deposit	875	1,719
Securities available-for-sale (AFS):
Purchase of AFS securities	(181,292)	(156,846)
Proceeds from prepayments and maturities of AFS securities	68,785	42,906
Proceeds from the sales of AFS securities	12,025	0
Change in loans, net	631	7,077
Purchase of premises and equipment	(2,570)	(2,160)
Proceeds from sale of premises and equipment	88	13
Additional investment in Federal Reserve Bank and Federal Home Loan Bank stock	(1)	(448)
Proceeds from sale of other real estate and other repossessed assets	5,041	4,171
Additional investment in other real estate and other repossessed assets	(167)	(61)
Additional investment in bank owned life insurance	0	(2,458)
Net cash used in investing activities	(96,585)	(106,087)
Cash flows from financing activities:
Change in deposits, net	62,356	75,004
Change in repurchase agreements, federal funds purchased, and other short-term borrowings, net	(20,444)	27,697
Advances from Federal Home Loan Bank	0	571
Payments on advances from Federal Home Loan Bank	(20,092)	(101)
Issuance of common stock	3,027	728
Excess tax benefits of stock-based compensation	(448)	86
Dividends paid	(9,537)	(9,325)
Net cash provided by financing activities	14,862	94,660
Net increase (decrease) in cash and cash equivalents	(50,033)	24,340
Cash and cash equivalents at beginning of period	238,481	158,983
Cash and cash equivalents at end of period	188,448	183,323
Supplemental disclosures:
Income taxes paid	10,200	8,380
Interest paid	10,189	12,925
Non-cash activities:
Loans to facilitate the sale of other real estate owned and other repossessed assets	2,635	739
Common stock dividends accrued, paid in subsequent quarter	4,796	4,665
Real estate acquired in settlement of loans	$ 7,495	$ 10,938