Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 34,310	$ 28,939
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,212	3,123
Deferred taxes	(2,340)	(3,373)
Stock-based compensation	443	499
Excess tax benefits of stock-based compensation	495	(32)
Provision for loan losses	6,504	10,222
Write-downs of other real estate owned and other repossessed assets	899	2,890
Gains on sale of mortgage loans held for sale	(1,982)	(1,166)
Gains on sales of securities	(819)	0
Losses on sale of assets, net	101	80
Proceeds from sale of mortgage loans held for sale	89,015	53,986
Funding of mortgage loans held for sale	(87,268)	(53,191)
Amortization of securities premiums and discounts, net	4,143	2,430
Change in cash surrender value of bank owned life insurance	(1,063)	(1,051)
Death benefits received on bank owned life insurance	0	79
Mortgage servicing rights:
Fair value adjustments	511	1,139
New servicing assets created	(510)	(378)
Changes in:
Other assets	456	508
Other liabilities	11,088	27,492
Net cash provided by operating activities	57,195	72,196
Certificates of deposit in other banks:
Maturity of certificates of deposit	3,117	1,483
Securities available-for-sale (AFS):
Purchase of AFS securities	(216,143)	(188,002)
Proceeds from prepayments and maturities of AFS securities	113,648	70,341
Proceeds from the sales of AFS securities	12,025	0
Change in loans, net	(9,118)	(2,666)
Purchase of premises and equipment	(3,823)	(2,806)
Proceeds from sale of premises and equipment	103	39
Additional investment in Federal Reserve Bank stock	(2)	(449)
Proceeds from sale of other real estate and other repossessed assets	7,915	6,437
Additional investment in other real estate and other repossessed assets	(527)	(254)
Additional investment in bank owned life insurance	0	(2,458)
Net cash used in investing activities	(92,805)	(118,335)
Cash flows from financing activities:
Change in deposits, net	33,485	102,705
Change in repurchase agreements, federal funds purchased, and other short-term borrowings, net	(2,949)	47,390
Advances from Federal Home Loan Bank	0	571
Payments on advances from Federal Home Loan Bank	(20,137)	(151)
Issuance of common stock	4,099	1,009
Excess tax benefits of stock-based compensation	(495)	32
Dividends paid	(14,333)	(13,994)
Net cash provided by (used in) financing activities	(330)	137,562
Net increase (decrease) in cash and cash equivalents	(35,940)	91,423
Cash and cash equivalents at beginning of period	238,481	158,983
Cash and cash equivalents at end of period	202,541	250,406
Supplemental disclosures:
Income taxes paid	11,325	8,380
Interest paid	14,303	18,841
Non-cash activities:
Loans to facilitate the sale of other real estate owned and other repossessed assets	2,897	1,375
Common stock dividends accrued, paid in subsequent quarter	4,882	4,749
Real estate acquired in settlement of loans	$ 10,540	$ 25,551