Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 42,470	$ 41,549
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	(7,001)	875
Net (gain) loss on disposal of property and equipment	(79)	(16)
Depreciation and amortization	7,786	8,298
Net premium amortization on investment securities	7,088	7,902
Net gains on investment securities transactions	(88)	4
Net gains on sales of mortgage loans held for sale	(7,601)	(14,984)
Net gain on sale of OREO	(766)	(2,671)
OREO valuation adjustments	10	3,180
Net impairment (reversal of impairment) of mortgage servicing rights	(56)	(59)
Deferred income tax expense	3,760	3,456
Net increase in cash surrender value of company-owned life insurance policies	(1,724)	(873)
Stock-based compensation expense	2,154	2,022
Tax benefits from stock-based compensation expense	1,225	524
Excess tax benefits from stock-based compensation	(1,211)	(468)
Originations of loans held for sale	(412,050)	(734,657)
Proceeds from sales of loans held for sale	402,825	739,648
Changes in operating assets and liabilities:
Increase in interest receivable	(47)	(403)
Decrease in other assets	(1,929)	7,004
Decrease in accrued interest payable	353	(266)
Decrease in accounts payable and accrued expenses	(4,788)	(4,112)
Net cash provided by operating activities	30,331	55,953
Cash flows from investing activities:
Purchases of held-to-maturity investment securities	(4,141)	(13,755)
Purchases of available-for-sale investment securities	(175,823)	(430,395)
Proceeds from maturities and paydowns of held-to-maturity investment securities	9,347	5,807
Proceeds from maturities and paydowns of available-for-sale investment securities	243,355	453,678
Purchases of company-owned life insurance	(15,000)	0
Proceeds from sales of mortgage servicing rights	266	470
Extensions of credit to customers, net of repayments	(155,523)	(84,078)
Recoveries of loans charged-off	5,345	7,057
Proceeds from sales of OREO	4,234	18,464
Capital contribution to unconsolidated equity method investee	(6,309)	(1,886)
Net cash used in investing activities	(94,249)	(44,638)
Cash flows from financing activities:
Net increase (decrease) in deposits	45,292	(310,079)
Net decrease in repurchase agreements	5,548	(84,471)
Net increase (decrease) in short-term borrowings	17	(30)
Repayments of long-term debt	(24)	(21)
Redemption of preferred stock	0	(50,000)
Proceeds from issuance of common stock	3,547	5,799
Excess tax benefits from stock-based compensation	1,211	468
Purchase and retirement of common stock	(8,764)	(448)
Dividends paid to common stockholders	(14,088)	(5,648)
Net cash provided by (used in) financing activities	32,739	(444,430)
Net increase (decrease) in cash and cash equivalents	(31,179)	(433,115)
Cash and cash equivalents at beginning of period	534,827	801,332
Cash and cash equivalents at end of period	503,648	368,217
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	16,190	20,838
Cash paid during the period for interest expense	$ 8,656	$ 11,252