Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net income	$ 64,942	$ 59,133
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	4,611	568
Net amortization of investment securities premiums and discounts	11,232	13,423
Net accretion of purchase accounting adjustments	(4,994)	(4,128)
Loans held for sale originated or acquired	(417,973)	(481,713)
Proceeds from sales of loans held for sale	475,919	482,533
Gain on sale of loans	(13,890)	(14,249)
Loss on sale of investments	622	112
Bank-owned life insurance income, net	(660)	(534)
Stock-based compensation	2,395	1,588
Net tax benefits from stock-based compensation	(1,378)	(552)
Depreciation of premises and equipment	7,334	7,532
Gain on sale of other real estate owned and write-downs, net	(1,033)	(22)
Amortization of core deposit intangibles	1,240	1,585
Amortization of investments in variable interest entities	2,007	925
Net decrease (increase) in accrued interest receivable	7	(3,014)
Net decrease in other assets	6,536	5,629
Net decrease in accrued interest payable	(51)	(26)
Net decrease in other liabilities	(191)	(8,978)
Net cash provided by operating activities	136,675	59,812
Investing Activities
Sales of available-for-sale securities	111,003	20,539
Maturities, prepayments and calls of available-for-sale securities	224,664	319,271
Purchases of available-for-sale securities	(17,402)	(188,827)
Maturities, prepayments and calls of held-to-maturity securities	15,235	21,625
Purchases of held-to-maturity securities	0	(1,222)
Principal collected on loans	947,134	773,672
Loans originated or acquired	(1,327,095)	(1,070,512)
Net additions to premises and equipment	(5,179)	(5,053)
Proceeds from sale of other real estate owned	6,759	5,636
Proceeds from sale of non-marketable equity securities	42,500	53,705
Purchases of non-marketable equity securities	(39,399)	(51,000)
Proceeds from bank-owned life insurance	437	294
Investments in variable interest entities	(10,177)	(654)
Net cash paid in acquisition	(4,091)	0
Net cash used in investing activities	(55,611)	(122,526)
Financing Activities
Net increase in deposits	128,827	142,886
Net decrease in securities sold under agreements to repurchase	(22,600)	(9,087)
Net decrease in short-term Federal Home Loan Bank advances	(62,800)	(40,000)
Repayments of long-term Federal Home Loan Bank advances	(227)	(25,241)
Net increase (decrease) in other borrowed funds	1,377	(36)
Cash dividends paid	(39,139)	(38,136)
Tax withholding payments for stock-based compensation	(1,453)	(592)
Net cash provided by financing activities	3,985	29,794
Net increase (decrease) in cash and cash equivalents	85,049	(32,920)
Cash and cash equivalents at beginning of period	152,541	193,253
Cash and cash equivalents at end of period	237,590	160,333
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	15,191	15,129
Cash paid during the period for income taxes	18,449	18,252
Supplemental Disclosure of Non-Cash Investing Activities
Sale and refinancing of other real estate owned	345	602
Transfer of loans to other real estate owned	3,521	3,635
Dividends declared but not paid	16,548	15,317
Fair value of common stock shares issued	46,673	0
Cash consideration for outstanding shares	17,342	0
Fair Value of Assets Acquired	355,230	0
Liabilities Assumed	$ 321,824	$ 0