Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 63,110	$ 57,805
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	26,795	13,157
Depreciation of premises, furniture, and equipment	7,584	6,993
Net amortization of premium on securities	7,738	8,327
Net securities gains	0	(284)
Gains on sales of 1-4 family mortgages and corporate loans held-for-sale	(3,134)	(3,293)
Net losses on sales and valuation adjustments of OREO	493	1,520
Amortization of the FDIC indemnification asset	604	604
Net losses (gains) on sales and valuation adjustments of premises, furniture, and equipment	5,449	(391)
BOLI income	(2,877)	(2,671)
Share-based compensation expense	6,196	5,827
Tax benefit (expense) related to share-based compensation	158	(13)
Amortization of other intangible assets	3,596	4,128
Originations of mortgage loans held-for-sale	(114,142)	(111,066)
Proceeds from sales of mortgage loans held-for-sale	130,900	116,655
Net increase in equity securities	(586)	0
Net increase in trading securities	0	(1,625)
Net decrease (increase) in accrued interest receivable and other assets	8,072	(7,481)
Net increase (decrease) in accrued interest payables and other liabilities	16,100	(6,933)
Net cash provided by operating activities	156,056	81,259
Investing Activities
Proceeds from maturities, repayments, and calls of securities available-for-sale	154,136	158,946
Proceeds from sales of securities available-for-sale	0	241,137
Purchases of securities available-for-sale	(462,071)	(172,451)
Proceeds from maturities, repayments, and calls of securities held-to-maturity	718	4,948
Purchases of securities held-to-maturity	0	(10)
Net purchases of FHLB stock	(13,070)	(3,955)
Net increase in loans	(479,514)	(225,537)
Premiums paid on BOLI, net of proceeds from claims	113	(6)
Proceeds from sales of OREO	8,638	8,476
Proceeds from sales of premises, furniture, and equipment	150	7,056
Purchases of premises, furniture, and equipment	(16,891)	(6,619)
Net cash received from acquisitions	0	41,717
Net cash (used in) provided by investing activities	(807,791)	53,702
Financing Activities
Net increase in deposit accounts	438,938	147,243
Net increase (decrease) in borrowed funds	266,160	(239,675)
Cash dividends paid	(21,619)	(16,485)
Restricted stock activity	(4,047)	(3,840)
Net cash provided by (used in) financing activities	679,432	(112,757)
Net increase in cash and cash equivalents	27,697	22,204
Cash and cash equivalents at beginning of period	346,570	262,148
Cash and cash equivalents at end of period	374,267	284,352
Supplemental Disclosures of Cash Flow Information:
Income taxes refunded	(18,898)	(958)
Interest paid to depositors and creditors	25,056	16,381
Dividends declared, but unpaid	11,248	9,165
Stock issued for acquisitions, net of issuance costs	0	534,090
Non-cash transfers of loans to OREO	1,172	1,982
Non-cash transfers of loans held-for-investment to loans held-for-sale	9,546	31,564
Non-cash transfer of trading securities and securities available-for-sale to equity securities	$ 27,855	$ 0