Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 33,259	$ 36,415
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,307	3,440
Deferred taxes	1,421	570
Stock-based compensation	548	498
Excess tax benefits of stock-based compensation	22	100
Provision for loan losses	5,380	7,349
Write-downs of other real estate owned and other repossessed assets	1,402	1,958
Gains on sale of mortgage loans held for sale	(781)	(2,805)
Losses on sales of securities	145	31
Gains (losses) on sale of assets, net	(3)	160
Proceeds from sale of mortgage loans held for sale	33,240	122,764
Funding of mortgage loans held for sale	(31,998)	(98,240)
Amortization of securities premiums and discounts, net	2,011	3,221
Change in cash surrender value of bank owned life insurance	(1,113)	(1,119)
Mortgage servicing rights:
Fair value adjustments	546	(173)
New servicing assets created	(234)	(768)
Changes in:
Other assets	297	3,674
Other liabilities	(943)	1,316
Net cash provided by operating activities	46,506	78,391
Certificates of deposit in other banks:
Maturity of certificates of deposit	389	(4,472)
Purchase of certificates of deposit	0	240
Securities available-for-sale (AFS):
Purchase of AFS securities	(177,579)	(197,263)
Proceeds from the sales of AFS securities	112,949	14,354
Proceeds from prepayments and maturities of AFS securities	49,094	94,211
Change in loans, net	(73,376)	(76,276)
Purchase of premises and equipment	(1,750)	(933)
Proceeds from sale of premises and equipment	22	93
Redemption of stock by Federal Home Loan Bank	7,746	0
Additional investment in Federal Reserve Bank stock	(1)	(1)
Proceeds from sale of other real estate and other repossessed assets	4,551	6,408
Additional investment in other real estate and other repossessed assets	0	(173)
Additional investment in bank owned life insurance	0	(7,950)
Proceeds from bank owned life insurance	0	644
Net cash used in investing activities	(77,955)	(171,118)
Cash flows from financing activities:
Change in deposits, net	47,107	(29,564)
Change in repurchase agreements, federal funds purchased, and other short-term borrowings, net	10,677	6,254
Proceeds from Federal Home Loan Bank advances	0	30,000
Payments on advances from Federal Home Loan Bank	(87)	(113)
Issuance of common stock	930	2,376
Excess tax benefits of stock-based compensation	(22)	(100)
Dividends paid	(15,339)	(14,690)
Net cash provided by (used in) financing activities	43,266	(5,837)
Net increase (decrease) in cash and cash equivalents	11,817	(98,564)
Cash and cash equivalents at beginning of period	106,641	207,560
Cash and cash equivalents at end of period	118,458	108,996
Supplemental disclosures:
Income taxes paid	10,170	14,250
Interest paid	8,058	9,426
Non-cash activities:
Loans to facilitate the sale of other real estate and other repossessed assets	5,745	2,231
Common stock dividends accrued, paid in subsequent quarter	207	4,992
Real estate acquired in settlement of loans	$ 5,267	$ 6,135