Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Activities
Net income	$ 59,133	$ 57,005
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	568	1,047
Net amortization of investment securities premiums and discounts	13,423	13,376
Loans held for sale originated or acquired	(481,713)	(449,630)
Proceeds from sales of loans held for sale	482,533	460,799
Gain on sale of loans	(14,249)	(13,030)
Loss on sale of investments	112	93
Stock-based compensation expense, net of tax benefits	459	700
Excess tax benefits from stock-based compensation	(15)	(102)
Depreciation of premises and equipment	7,532	6,658
(Gain) loss on sale of other real estate owned and write-downs, net	(22)	619
Amortization of core deposit intangibles	1,585	1,486
Net increase in accrued interest receivable	(3,030)	(3,173)
Net (increase) decrease in other assets	(3,484)	3,983
Net decrease in accrued interest payable	(31)	(496)
Net decrease in other liabilities	(8,552)	(2,405)
Net cash provided by operating activities	54,249	76,930
Investing Activities
Sales of available-for-sale securities	20,539	35,558
Maturities, prepayments and calls of available-for-sale securities	319,271	346,230
Purchases of available-for-sale securities	(188,827)	(347,212)
Maturities, prepayments and calls of held-to-maturity securities	21,625	10,065
Purchases of held-to-maturity securities	(1,222)	(83,004)
Principal collected on loans	765,468	723,316
Loans originated or acquired	(1,070,512)	(967,774)
Net decrease (increase) of premises and equipment and other real estate owned	8,451	(7,403)
Proceeds from sale of other real estate owned	5,636	6,288
Net proceeds from sale of non-marketable equity securities	2,705	29,877
Net cash received in acquisitions	0	19,712
Net cash used in investing activities	(116,866)	(234,347)
Financing Activities
Net increase in deposits	143,808	66,625
Net (decrease) increase in securities sold under agreements to repurchase	(9,087)	10,472
Net decrease in short-term Federal Home Loan Bank advances	(40,000)	0
Proceeds from Federal Home Loan Bank Borrowings	0	50,000
Repayments of long-term Federal Home Loan Bank advances	(25,299)	(19,410)
Net decrease in other borrowed funds	(1,604)	(575)
Cash dividends paid	(38,136)	(36,188)
Excess tax benefits from stock-based compensation	15	102
Stock-based compensation activity	0	(299)
Net cash provided by financing activities	29,697	70,727
Net decrease in cash and cash equivalents	(32,920)	(86,690)
Cash and cash equivalents at beginning of period	193,253	442,409
Cash and cash equivalents at end of period	160,333	355,719
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	15,129	15,248
Cash paid during the period for income taxes	18,252	15,961
Supplemental Disclosure of Non-Cash Investing Activities
Sale and refinancing of other real estate owned	602	265
Transfer of loans to other real estate owned	3,635	5,181
Dividend declared but not paid	15,317	14,388
Fair value of common stock shares issued	0	10,776
Cash consideration for outstanding shares	0	12,219
Fair value of assets acquired	0	174,637
Liabilities assumed	$ 0	$ 152,779