Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 23,762	$ 24,101
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,301	2,119
Deferred taxes	(8,370)	(1,172)
Stock-based compensation	335	294
Excess tax benefits of stock-based compensation	42	448
Provision for loan losses	5,220	3,585
Write-downs of other real estate owned and other repossessed assets	1,776	359
Gains on sale of mortgage loans held for sale	(2,152)	(1,322)
(Gains)/losses on sales of securities	8	(819)
Losses on sale of assets, net	92	55
Proceeds from sale of mortgage loans held for sale	93,445	58,797
Funding of mortgage loans held for sale	(71,798)	(57,979)
Amortization of securities premiums and discounts, net	2,217	2,807
Change in cash surrender value of bank owned life insurance	(704)	(688)
Mortgage servicing rights:
Fair value adjustments	(296)	119
New servicing assets created	(562)	(340)
Changes in:
Other assets	3,472	(1,338)
Other liabilities	4,672	2,664
Net cash provided by operating activities	53,460	31,690
Certificates of deposit in other banks:
Maturity of certificates of deposit	240	875
Purchase of certificates of deposit	(4,472)	0
Securities available-for-sale (AFS):
Purchase of AFS securities	(176,783)	(181,292)
Proceeds from prepayments and maturities of AFS securities	66,622	68,785
Proceeds from the sales of AFS securities	0	12,025
Change in loans, net	(42,740)	631
Purchase of premises and equipment	(603)	(2,570)
Proceeds from sale of premises and equipment	38	88
Additional investment in Federal Reserve Bank stock	(1)	(1)
Proceeds from sale of other real estate and other repossessed assets	5,730	5,041
Additional investment in other real estate and other repossessed assets	(48)	(167)
Additional investment in bank owned life insurance	(7,306)	0
Net cash used in investing activities	(159,323)	(96,585)
Cash flows from financing activities:
Change in deposits, net	18,325	62,356
Change in repurchase agreements, federal funds purchased, and other short-term borrowings, net	(3,624)	(20,444)
Payments on advances from Federal Home Loan Bank	(82)	(20,092)
Issuance of common stock	1,272	3,027
Excess tax benefits of stock-based compensation	(42)	(448)
Dividends paid	(9,787)	(9,537)
Net cash provided by financing activities	6,062	14,862
Net decrease in cash and cash equivalents	(99,801)	(50,033)
Cash and cash equivalents at beginning of period	207,560	238,481
Cash and cash equivalents at end of period	107,759	188,448
Supplemental disclosures:
Income taxes paid	10,340	10,200
Interest paid	6,474	10,189
Non-cash activities:
Loans to facilitate the sale of other real estate owned and other repossessed assets	1,007	2,635
Common stock dividends accrued, paid in subsequent quarter	4,904	4,796
Real estate acquired in settlement of loans	$ 4,655	$ 7,495